1-6000"  to  1-2880".
M.  gliscens^  ovate,  colourless ;  motion  gliding.  In  infusions  of  stinging-netde.
1-4500".
M.  cylindrical  solitary,  elongate,  colourless;  motion  revolving.     In  salt  water.
1-1150"-

M.  Okeni,  elongate,  red ;  motion  revolving,  vibratory ;  social    In  running  water.
1-2300".
M.  socialise  conical,  colourless ;  social     In  water-butts.     1-700".
*  De  Fromentel,  '  fitudes  sur  les  Microzoaires,'  Paris,  1876.
t  '  A  History  of  the  Infusoria,*  by  Andrew  Pritchard,  4th  ed.  i860.
GENUS  CYA  THOMONAS.  24 1

M,  simplex^  spindle-shaped,  colourless ;  motion  gliding  or  rotatory.  In  water  of
the  Nile  and  at  Berlin.     1-1720".
M.  inanis^  fusiform,  colourless;  motion  vacillating.  In  stagnant  and  foul
water.     1-3600".
M  scintillanSy  fusiform;  very  active,  motion  vacillating.  Among  fresh-water
Confervae.    1-6000"  to  1-4600".
M.  Dumalii  (described  by  Dujardin  as  possessing  two  flagella,  and  therefore
referable  to  the  Dimastigous  group),  of  a  deep  red  colour ;  in  vast  numbers  in  the
salt-marsh  water  of  the  Mediterranean,  to  which  they  give  a  deep  blood-colour.
M  prodigiosan  a  minute  red  monad,  producing  the  blood-like  spots  occasionally
appearing  in  bread  and  other  farinaceous  substances.  (Cohn  asserts  this  oiganism
to  be  a  Vibrio^  and  not  a  Monas,)

M.  astasioideSy  Pty.,  of  variable  form,  often  with  one  or  two  longitudinal  lines  and
a  central  vacuole.     1-1340".
M.  piscatorumy  irregularly  oval,  pointed  anteriorly ;  colourless ;  flagellum  short,
scarcely  li  times  the  length  of  the  body ;  movements  sluggish.     1-1400".
M  suaissa,  oval ;  usually  truncate,  rarely  pointed  behind ;  colourless,  with  large
vacuoles ;  flagellum  twice  the  length  of  the  body ;  movement  active  and  revolving.
In  fresh  pond  water.     1-1800".
