MR.  T.  BELL  ON  THE  GENUS  CANCER. 
337 
specimens.  The  orbits  have  a  rather  strong  tooth  over  the  inner  canthus ;  there  are 
two  parallel  fissures  above,  and  one  beneath.  The  latero-anterior  margin  on  each  side 
extends  as  far  backwards  as  the  centre  of  the  cardiac  region,  where  it  is  lost  in  a 
sinuous  granulated  ridge  which  rises  over  the  latero-posterior  margin.  It  is  divided 
into  ten  lobes,  which  are  either  quadrate,  and  therefore  contiguous  at  the  sides,  as  in 
most  of  the  species  ;  or  lanceolate,  as  in  Cane,  dentatus :  the  last  lobe  is  always  very 
small,  and  often  obsolete. 
The  external  antenna  have  the  basilar  joint  broad,  very  long  and  thick,  filling  the 
hiatus  between  the  inner  canthus  of  the  orbit  and  the  front,  and  terminating  forwards 
in  a  strong,  angular,  tooth-like  projection,  directed  forwards  and  a  little  inwards, 
reaching  beyond  the  frontal  line.  The  terminal  or  moveable  portion  is  slender,  very 
short,  and  arises  from  the  internal  part  of  the  basilar  joint,  nearer  to  the  cell  of  the  in- 
ternal antenna  than  to  the  orbit.  The  internal  antenna,  instead  of  lying  obliquely  out- 
wards or  transversely,  as  in  most  other  genera  of  this  section,  are  directed  forwards  ;  a 
character  by  which  Cancer  may  at  once  be  distinguished  from  Platypodia,  Carpilius, 
Xantho,  &c.  The  second  joint  of  the  inner  footstalk  of  the  external  pedipalps  is  ex- 
cavated at  the  anterior  part  of  the  inner  margin  ;  in  some  species  the  notch  is  confined 
to  the  angle,  in  others  it  extends  half  way  down  the  side  of  the  joint.  The  first  pair  of 
feet  is  nearly  equal ;  in  some  specimens  of  each  species  the  difference  in  size  being 
scarcely  appreciable.  They  are  generally  very  robust.  The  remaining  feet  have  no 
spines,  but  are  in  most  species  more  or  less  hairy.  The  abdomen  of  the  male  has  five, 
that  of  the  female  seven,  joints. 
With  the  exception  of  our  indigenous  species,  Cane.  Pagurus,  they  are  all,  as  far  as 
their  localities  are  yet  known,  exclusively  natives  of  the  coasts  of  the  hotter  parts  of 
America. 
1.  Cancer  longipes. 
Tab.  XLIII. 
Cane,  testa  leviter  granulatd,  sparsim  punctata;  margine  antico -later ali  plicato,  deeem- 
lobato,  lobis  contiguis,  ad  marginem  minute  denticulatis ;  manibus  lavibus,  exius  lineis 
quinque  impresso-punctatis ;  pedibus  longioribus ;  abdominis  articulo  ultimo  cequilate- 
raliter  triangulari. 
Hab.  apud  Valparaiso.  (Cuming.) 
Muss.  Soc.  Zool.,  Bell. 
The  general  colour  and  thin  texture  of  the  carapax,  with  the  long  slender  form  of 
the  legs,  remove  this  species  at  first  sight  far  from  those  which  a  nearer  inspection 
prove  to  be  very  nearly  allied  to  it ;  particularly  Cane.  Edivardsii,  to  which  many  of  its 
most  important  characters  so  closely  approximate  it,  as  to  require  some  care  in  ex- 
pressing its  specific  diagnostic  phrase. 
