﻿10 
  Mr. 
  R. 
  I. 
  Pocock 
  on 
  the 
  

  

  regions 
  of 
  the 
  carapace 
  are 
  much 
  more 
  sharply 
  defined 
  

   than 
  in 
  tenuipes. 
  

  

  P. 
  macropa, 
  Edwards, 
  Arch, 
  du 
  Mus. 
  vii. 
  p. 
  175, 
  pi. 
  xii. 
  

   fig. 
  3. 
  — 
  Closely 
  allied 
  to 
  tenuipes, 
  but 
  has 
  the 
  lateral 
  

   margins 
  of 
  the 
  carapace 
  not 
  denticulated. 
  

  

  P. 
  denticulata, 
  Edwards, 
  Ann. 
  Sci. 
  Nat. 
  Zool. 
  (3) 
  xx. 
  p. 
  208. 
  

   — 
  The 
  superior 
  frontal 
  crest 
  is 
  not 
  bilobed 
  and 
  the 
  merus 
  

   of 
  the 
  chelipedes 
  is 
  feebly 
  dentate. 
  

  

  P. 
  americana, 
  Saussure, 
  Mem. 
  Crust. 
  Nouv. 
  des 
  Ant. 
  et 
  du 
  

   Mex. 
  p. 
  20, 
  pi. 
  ii. 
  fig. 
  12. 
  — 
  In 
  this 
  species 
  there 
  is 
  no 
  

   superior 
  frontal 
  crest 
  and 
  the 
  orbits 
  and 
  margins 
  of 
  the 
  

   carapace 
  are 
  without 
  denticulations. 
  

  

  P. 
  Bocourti, 
  A. 
  Edwards, 
  Ann. 
  Soc. 
  Ent. 
  Fr. 
  (4) 
  vi. 
  p. 
  203. 
  

   — 
  The 
  frontal 
  crests 
  are 
  smooth. 
  

  

  P. 
  gracilipeS) 
  id. 
  ibid. 
  p. 
  204. 
  — 
  This 
  species 
  apparently 
  re- 
  

   sembles 
  tenuipes 
  in 
  the 
  form 
  of 
  the 
  legs, 
  but 
  there 
  is 
  

   scarcely 
  a 
  trace 
  of 
  the 
  superior 
  frontal 
  crest. 
  

  

  P. 
  sinuatifrons, 
  id. 
  ibid. 
  p. 
  205. 
  — 
  The 
  inferior 
  frontal 
  crest 
  

   is 
  sinuous 
  and 
  the 
  inferior 
  surface 
  of 
  the 
  carapace 
  is 
  fur- 
  

   nished 
  with 
  a 
  series 
  of 
  granules. 
  

  

  P. 
  plana, 
  S. 
  I. 
  Smith, 
  Trans. 
  Conn. 
  Acad. 
  ii. 
  p. 
  146. 
  — 
  Appa- 
  

   rently 
  allied 
  to 
  tenuipes, 
  but 
  differing 
  in 
  the 
  form 
  of 
  the 
  

   merus, 
  which 
  is 
  said 
  to 
  be 
  short 
  and 
  slightly 
  dentate. 
  

  

  MACRURA. 
  

   Palaernonidse. 
  

  

  Bithynis 
  jamaicensis, 
  Herbst. 
  

  

  Palcemon 
  jamaicensis, 
  Herbst, 
  Naturg. 
  der 
  Krabben, 
  ii. 
  p. 
  57, 
  pi. 
  xxvii. 
  

   fig. 
  2; 
  Milne-Edwards, 
  Crust, 
  ii. 
  p. 
  398; 
  v. 
  Martens, 
  Arcli. 
  f. 
  

   Naturg. 
  1869, 
  p. 
  22. 
  

  

  Thirteen 
  small 
  specimens 
  taken 
  at 
  Laiou. 
  

  

  Bithynis 
  spinimanus, 
  M. 
  -Edwards. 
  

  

  Palcimon 
  spinimanus, 
  M.-Edwards, 
  Crust, 
  ii. 
  p. 
  399 
  ; 
  von 
  Martens, 
  

   Arch. 
  f. 
  Naturg. 
  1869, 
  p. 
  26. 
  

  

  A 
  single 
  specimen 
  from 
  Laiou. 
  

  

  ? 
  Bithynis 
  appuni, 
  von 
  Martens. 
  

  

  Palcemon 
  appuni, 
  von 
  Martens, 
  Arch. 
  f. 
  Naturg. 
  xxxv. 
  p. 
  31, 
  pi. 
  ii. 
  

   fig. 
  5. 
  

  

  