^r  Mr.  Choules  hta  described  in  the '  Zoolc^st'  a  spedes

"^  of  Phyaa  which  he  found  in  a  water-tank  in  Kew  Gar-

dens^ and  which  Mr.  Norman  (being  misinformed  as  to
the  precise  locality)  has  proposed  to  admit  into  our
native  Fauna.    It  appears  to  be  a  variety  of  the  P.  acuta
of  Drapamaud,  but  it  is  undistinguishable  from  speci-
mens in  the  British  Museum  which  were  collected  in
^^^^''^^uba,  St.  Thomas,  and  St.  Croix ;  and  it  hm^  probably
^^  beeR- introduced  with  some  aquatic  tropical  plant.    Dr.
^       Hooker  informs  me  that  many  West-Indian  plants  have
been  imported  and  cultivated  in  the  Oardens.     P.  acuta
has  never  (so  far  as  I  am  aware)  been  found  in  this
country;   and  although  it  is  abundant  in  the  middle
and  Sputh  of  France,  it  has  not  been  recorded  as  inha-
biting any  of  the  northern  Departments.    The  P,  «iA-
opaca  of  Lamarck  is  a  variety  of  that  species.
The  P.  alba  of  Turton,  who  stated  that  he  had  received

it  from  Capt.  Blomer  as  a  native  of  Towyn  in  North

-^         Wales,  is  the  P.  cqntorta  of  Michaud,  and  is  only  known

to  inhabit  the  Eastern  Pyrenees,  Corsica,  Sicily,  and

Algeria.
rr


/r  «0«<y^.  ^j5V


y^


>^2;*yi**^ -^><«2


.LIMNiEA.  101

Genus  III.  LIMNiE'A  *,  {Lymnea)  Bruguiere.
PL  IV.  f.  8,  9,  10,

BoDT  rather  long  and  twisted  in  a  spiral  coil :  head  pro-
minent :  tentacles  ^ort,  triangular  and  flattened :  foot  oblong,
bilobed  or  notched  in  front  and  obtusely  rounded  behind,  at-
tached to  the  upper  part  of  the  body  as  in  Physa.
Shell  conic-oval  or  elongated:  spire  usually  produced,
deztral  or  turning  from  the  left  to  right.
