﻿[51] 
  

  

  DECAPODA 
  FROM 
  ALBATROSS 
  DREDGINGS. 
  

  

  6G5 
  

  

  Nematocarcinus 
  cursor 
  A. 
  M.-Edwards. 
  

  

  Ann. 
  Sci. 
  Nat., 
  Zool., 
  VI, 
  ix, 
  No. 
  4, 
  p. 
  14, 
  1881 
  ; 
  Recueil 
  de 
  figures 
  de 
  Crustacea 
  

   nouveaux 
  ou 
  peu 
  connus, 
  pi. 
  [37], 
  1883. 
  

  

  , 
  • 
  (Plate 
  XVII, 
  Figs. 
  1, 
  la.) 
  

  

  Specimens 
  examined. 
  

  

  A 
  single 
  female 
  was 
  taken 
  by 
  the 
  Fish 
  Hawk 
  in 
  1880, 
  station 
  892, 
  

   October 
  2, 
  north 
  lat. 
  39° 
  40', 
  west 
  long. 
  71° 
  5', 
  487 
  fathoms, 
  soft 
  brown 
  

   mud 
  and 
  small 
  stones, 
  but 
  no 
  other 
  specimens 
  were 
  found 
  until 
  1884. 
  

   During 
  the 
  winter 
  cruise 
  of 
  the 
  Albatross 
  in 
  1884, 
  a 
  considerable 
  num- 
  

   ber 
  of 
  specimens 
  (G,810) 
  were 
  taken 
  in 
  the 
  Eastern 
  Caribbean, 
  station 
  

   2117, 
  January 
  27, 
  nortli 
  lat. 
  15° 
  24' 
  40", 
  west 
  long. 
  G3° 
  31' 
  30", 
  683 
  

   fathoms, 
  yellow 
  mud 
  and 
  fine 
  sand, 
  temperature 
  40°. 
  

  

  This 
  species 
  is 
  closely 
  allied 
  to 
  N. 
  ensiferus, 
  but 
  is 
  readily 
  distin- 
  

   guished 
  by 
  the 
  very 
  much 
  shorter 
  rostrum 
  and 
  larger 
  eyes. 
  

  

  Aside 
  from 
  the 
  rostrum 
  the 
  carapax 
  is 
  nearly 
  as 
  in 
  JST. 
  ensiferus, 
  but 
  

   the 
  rostral 
  carina 
  is 
  not 
  quite 
  so 
  high 
  in 
  front, 
  and 
  the 
  rostrum 
  itself 
  is 
  

   short 
  — 
  less 
  than 
  a 
  third 
  as 
  long 
  as 
  the 
  rest 
  of 
  the 
  carapax 
  — 
  scarcely 
  

   reaches 
  the 
  distal 
  segment 
  of 
  the 
  peduncle 
  of 
  the 
  antennula, 
  is 
  horizon- 
  

   tal, 
  obtusely 
  pointed, 
  the 
  dorsal 
  edge 
  armed 
  with 
  a 
  series 
  of 
  small 
  spines 
  

   as 
  in 
  N. 
  ensiferus, 
  and 
  usually 
  with 
  a 
  minute 
  tooth 
  beneath 
  the 
  tip. 
  

   The 
  eyes 
  are 
  similar 
  to 
  those 
  of 
  N. 
  ensiferus, 
  but 
  much 
  larger, 
  the 
  length 
  

   of 
  the 
  eye 
  and 
  stalk 
  fully 
  equaling 
  or 
  exceeding 
  the 
  breadth 
  of 
  the 
  

   antennal 
  scale, 
  and 
  the 
  diameter 
  of 
  the 
  eye 
  equaling 
  about 
  three-fourths 
  

   of 
  the 
  same 
  amount. 
  The 
  antennulae, 
  antennae, 
  and 
  oral 
  appendages 
  

   differ 
  very 
  little 
  from 
  those 
  of 
  N~. 
  ensiferus. 
  

  

  The 
  peraeopods 
  are 
  similar 
  to 
  those 
  of 
  -2V". 
  ensiferus, 
  but 
  are 
  apparently 
  

   even 
  longer 
  than 
  in 
  that 
  species. 
  The 
  first 
  pair 
  reach 
  by 
  the 
  tips 
  of 
  the 
  

   antennal 
  scales 
  by 
  the 
  length 
  of 
  the 
  chelae 
  or 
  a 
  little 
  more, 
  are 
  naked 
  

   except 
  at 
  the 
  tips 
  of 
  the 
  digits 
  and 
  unarmed 
  except 
  by 
  single 
  spines 
  at 
  

   the 
  distal 
  ends 
  of 
  the 
  ischia. 
  The 
  second 
  pair 
  are 
  nearly 
  as 
  long 
  as 
  the 
  

   length 
  from 
  tip 
  of 
  rostrum 
  to 
  tip 
  of 
  telson, 
  unarmed 
  except 
  by 
  a 
  very 
  

   few 
  spines 
  on 
  the 
  ischia 
  and 
  meri, 
  and 
  nearly 
  naked 
  except 
  at 
  tire 
  tips 
  

  

  