fig1 illustrates a top perspective view of the assembled lid 8 . lid 8 comprises disc 10 having raised center section 11 on top thereof , snap fitting periphery 12 along the sides thereof , moat 13 , drinking hole 14 and air hole 16 extending through , and chamber 18 illustrated as arch - shaped , has top portion 19 and drinking hole 14 extending therethrough . top portion 19 rises above the surface of disc 10 . fig2 is a perspective view of the bottom of lid 8 . as shown in fig2 bottom portion 20 of chamber 18 is sunken below the bottom surface of disc 10 . bottom portion 20 has two inlet openings 21 and 22 . chamber 18 is in fluid communication with drinking hole 14 such that when a user drinks from a cup , the liquid contents of the cup flow through inlet openings 21 , 22 into chamber 18 , through chamber 18 to drinking hole 14 and into the user &# 39 ; s mouth . bottom section 30 is used to form chamber 18 and a portion of snap fitting periphery 12 . bottom section 30 comprises arched side 32 with snap fitting periphery portion 34 . disc 10 has snap fitting periphery 36 . snap fitting periphery portion 36 along with snap fitting periphery portion 34 makes up snap fitting periphery 12 . lid 8 is securely held on a cup due to the engagement between snap fitting periphery portions 34 , 36 and the rim of the cup . this engagement between snap fitting periphery portions 34 and 36 occur when the lid 8 is pressed down onto the rim of the cup . such snap fitting periphery portions 34 , 36 are conventional and well - known to those of skill in the art . the snap fitting periphery portions 34 , 36 house the lip of the cup when the two are joined . as shown in fig3 which is a top view of lid 8 unassembled into its two pieces , bottom section 30 and disc 10 , bottom section 30 and disc 10 are connected along their respective peripheries at joint 38 . bottom section 30 has arched side 32 with snap fitting periphery portion 34 . bottom section 30 has bottom portion 20 which forms the bottom and a part of the lower side walls of chamber 18 . inlet openings 21 , 22 are shown in the bottom wall of portion 20 . fig4 a illustrates a cross - section of unassembled lid 8 of the present invention . as shown therein , bottom section 30 is connected to disc 10 by joint 38 . joint 38 is a conventional weak spot which allows for the rotation of bottom section 30 under disc 10 as shown in fig4 b and 4c . bottom portion 20 has bottom wall 40 and lower side walls 42 and 44 . top portion 19 has top wall 46 and upper side walls 48 and 50 . when bottom section 30 is rotated around joint 38 , bottom wall 40 , top wall 46 , lower side walls 42 , 44 and upper side walls 48 , 50 form chamber 18 . it is preferred that bottom section 30 is securely fixed to disc 10 by means of a latch mechanism which is illustrated as projection 52 and channel 54 . in the embodiment shown in fig4 a - 4c , projection 52 is on the bottom side of disc 10 and channel 54 is on the bottom section 30 . alternatively , however , bottom section 30 could have the protrusion and disc 10 could contain the channel . it will be understood , however , that such a latching mechanism is not necessary because , when bottom section 30 is rotated about joint 38 so as to join bottom section 30 to the underside of disc 10 , the force between the rim of the cup and snap fitting periphery portion 34 is enough to maintain the engagement between disc 10 and bottom section 30 . it will be appreciated that the rim of the cup forces snap fitting periphery portion 34 up to and against disc 10 as shown in fig4 c . rim 56 of cup 58 is illustrated in fig4 c . it should be appreciated that although two inlets 21 and 22 are illustrated , additional inlets in chamber 18 may be employed . specifically , there can be inlets in lower end walls 60 and 62 of chamber 18 . lower end walls 60 and 62 are illustrated in fig2 . alternatively , one inlet may be used which may be in bottom portion 20 or lower end walls 60 or 62 . it will also be appreciated that although fig3 illustrates that bottom section 30 is positioned directly opposite drinking hole 14 , joint 38 can be at another location along the periphery of disc 10 , provided that when section 30 is rotated about joint 38 , bottom portion 20 aligns with top portion 19 to form chamber 18 . it will also be noted in fig4 a - 4c that disc 10 has no snap fitting periphery in the area in which snap fitting periphery portion 34 resides . thus , disc 10 has no snap fitting periphery along a portion of its periphery , that portion being the portion which is filled by snap fitting periphery portion 34 upon rotation of bottom section 30 against disc 10 . obviously , the dimensions of the lid assembly are adjusted accordingly depending on the size of the cup . typically , disposable cups are made in different sizes , such as small , medium and large . the lid of the present invention will have its dimensions adjusted accordingly for each one of the cup dimensions . the lid assembly of the present invention is made in any conventional plastic molding process wherein the lid assembly is molded in a simple molding operation in a conventional manner using conventional equipment . it will be appreciated by those of skill in the art that lid 8 in the unassembled form , i . e . lid assembly as shown in fig3 and 4a , easily nest with one another . this is important for the purposes of shipping the lids to different users . as will be appreciated , the unassembled lid 8 takes up less volume than the assembled lid 8 as shown in fig1 and 4 c . it will be appreciated that it is preferred that disc 10 employ moat 13 as shown in fig1 so as to catch any liquid that may escape from drinking hole 14 . this moat is not essential and need not be present in the invention as shown in fig4 a - 4c . it will also be appreciated that the cross - sectional dimensions of chamber 18 may be rounded as shown in fig1 and 2 , or may be rectangular in shape as shown in fig4 a - 4c . in fig4 d , an identical lid assembly as shown in fig4 a - 4c is illustrated , except that in fig4 d bottom section 30 is not hinged to disc 10 by joint 38 , hence , joint 38 is absent from fig4 d . as seen in fig5 a - 5b , disc 10 is coplanar such that top portion 19 of chamber 18 is coplanar with disc 10 . drinking hole 14 is positioned in top portion 19 of chamber 18 . additionally , as shown in fig5 a - 5b , bottom section 30 is a separate piece from disc 10 . the embodiment shown in fig5 a - 5b , the two pieces , disc 10 and bottom section 30 , are separately molded or , alternatively , have been molded together but have been separated from each other . additionally , arched side 32 has no snap fitting periphery 34 but , rather , flange 34 ′ that fits into snap fitting periphery 36 ′. snap fitting periphery 36 ′ is designed to accommodate flange 34 ′. turning to fig6 - 9 , alternative embodiments of bottom section 30 and chamber 18 are shown . in fig6 the bottom portion of chamber 18 is shown as a straight tube . in fig7 bottom portion 20 of chamber 18 is shown being perpendicular to the periphery of disc 10 . in fig8 bottom portion 20 of chamber 18 is illustrated as a pillow . in fig9 bottom section 30 is shown as not extending all the way to hole 16 . it can also be seen that bottom wall 40 of chamber 18 is peaked at the center and slanted towards inlets 21 , 22 to allow fluid to run out of chamber 18 when lid 8 is horizontal . it will be appreciated that top portion 19 is either flat as shown in fig5 a - 5b , or is shaped to match bottom portion 20 of chamber 18 as shown in fig4 a - 4d . fig1 illustrates a top view of bottom portion 20 of chamber 18 where chamber 18 has one or more baffles 64 positioned therein . baffles 64 help to prevent spillage . baffles 64 extend upward from bottom wall 40 and against lower side walls 42 and 44 as shown . preferably , the height of baffles 64 are equal to the height of side walls 42 and 44 . it will be understood that the claims are intended to cover all changes and modifications of the preferred embodiments of the invention herein chosen for the purpose of illustration which do not constitute a departure from the spirit and scope of the invention .