57 
artificial  lake  in  the  city  of  Pará.  Description 
and  figure  are  reproduced  in  the  appendix 
and  on  Plate  XVIII  (Fig.  13  a,  b.) 
Besides  the  species  I  mentioned,  a 
few  more  might  be  found  in  Brazil;  but  the 
number  of  good  species  is  small,  and  may 
not  much  exceed  15,  which  represents  about 
the  number  of  known  species.  In  order  to 
help  the  determination  of  such  species  and 
other  new  ones  which  might  appear,  1  give 
a  reproduction  made  of  all  the  available 
drawings,  published  up  to  now,  of  south- 
american  species,  and  a  copy  of  the  descrip¬ 
tions.  In  the  Iconographia  of  REEVE-SO- 
WERBY,  there  are  many  coloured  figures  of 
new  or  already  described  species,  but  the 
latter  do  not  seem  to  be  always  well  deter¬ 
mined.  The  drawings  are  not  vv  -y  accurate 
and  the  colouring  does  not  help,  as  it  is  not 
very  natural.  Only  new  species  or  those 
the  original  drawing  of  which  was  wanting, 
are  reproduced,  using  a  technique  for  the 
drawings  which  allowed  to  compare  all 
the  species.  This  work  was  done  very  care¬ 
fully  by  a  clever  artist.  I  could  not  obtain 
all  the  littérature  and  so  a  few  species  may 
be  missed.  I  also  advise  comparing  the 
central-american  species  of  which  several 
appear  in  South  America.  The  distribution 
of  fresh-water  shells  is  altogether  rather  cu¬ 
rious  and  not  always  in  relation  with  that 
of  terrestrian  animals. 
In  the  “Proceedings  of  the  Academy  of 
natural  Sciences  i  f  Philadelphia”,  December 
1913,  FRED  BAKER  published  a  paper  on 
the  land  and  fresh-water  mollusks  of  the 
Stanford  Expedition  to  Brazil.  In  this  he 
enumerates  the  following  species: 
Planorbis  anatinus  ORBIQNY— 25  spe¬ 
cimens  in  a  natural  lake  in  Belém 
do  Pará. 
PI.  cultratus  d’ORBIONY  -  Lagoa  de  Pa- 
pary  near  Natal,  6  spec. 
PI.  cimex  MORICAND-13  spec,  with 
PI.  cultratus, 
PL  guadaloupensis  SOW  ERBY -  Com¬ 
mon  near  the  lake  of  Papary  with 
cimex  and  cultratus.  Dead  speci¬ 
mens  were  not  rare  on  the  mar¬ 
gins  of  lake  Estremoz. 
PL  stramineus  DUNKER-Lake  Papary 
with  the  preceding  species. 
PL  depressissimus  MORICAND  and  pe¬ 
regrinas  d’ORBIGNY -One  speci¬ 
men  of  each  from  the  coast  of 
Ceará,  sent  by  Sr.  ROCHA. 
Segmentina  paparyensis  n.  sp. -2  spec, 
from  lake  Papary. 
Planorbis  anatinus  d’ORBIGNY  -  25  spe¬ 
cimens  in  an  artificial  lake  in  Belem, 
Pará. 
Pi.  cultratus  d’ORBIGNY  —  Lago  de  Pa- 
pary  near  Natal,  6  specimens. 
PL  cimex  MORICAND  — 13  specimens 
together  with  the  preceeding  one. 
PI.  guadaloupensis  SOWERBY — Common 
near  the  Lagoa  de  Papary,  toge¬ 
ther  with  the  two  preceeding  ones. 
Dead  specimens  were  not  rare  at 
the  border  of  Lagoa  de  Estremoz. 
PI.  stramineus  DUNKER- Lagoa  de  Pa¬ 
pary  with  the  preceeding.  Ceará  - 
Mirim  and  Ceará. 
PL  depressissimus  MORICAND  and  Pi. 
peregrinus  d’ORBIGNY  1  )  -  one  spe¬ 
cimen  of  each  species,  from  the 
coast  of  Ceará,  received  from 
ROCHA. 
Segmentina  paparyensis,  n.  sp.— 2  Spe¬ 
cimens  from  Lagoa  de  Papary. 
List  of  south  american  species  of  Pla¬ 
norbis,  mentioned  in  the  littérature. 
(Fig.  on  Plate  18). 
albicans  Pfeiffer.  Hab.  Lima  (Mus.  Brit.) 
REEVE.  Spec.  117,  F.  18.  a,  b. 
(Cop). 
anatinus  D’ORB.  Rio  Paraná  -  D’ORB.  p. 
351  pi.  XIV,  fig.  17-20  F.  13  a,  b. 
(Cop.; 
andecolus  D’ORB.  Lake  Titicaca  F.  5,  cop. 
from  the  orig.  f.  6  REEVE. 
biangulatus  SOW.  (?=nigricans  Brazil.) 
1)  Probably  my  centimetralis. 
