﻿Crustacea 
  of 
  Dominica. 
  15 
  

  

  specimens 
  of 
  tubercles 
  either 
  tipped 
  with 
  spines 
  or 
  with 
  

   smooth 
  vertices. 
  The 
  interstices 
  between 
  the 
  spines 
  or 
  

   tubercles 
  of 
  these 
  three 
  pereiopods 
  are 
  more 
  or 
  less 
  thickly 
  

   clothed 
  with 
  short 
  fine 
  hair, 
  and 
  in 
  some 
  individuals 
  there 
  is 
  

   a 
  distinct 
  series 
  of 
  long 
  hairs 
  running 
  on 
  the 
  outside 
  from 
  the 
  

   proximal 
  to 
  the 
  distal 
  end 
  of 
  the 
  appendage. 
  

  

  Branchial 
  Formula. 
  

  

  5 
  + 
  5 
  + 
  3 
  + 
  1 
  =14 
  

  

  The 
  ornamentation 
  of 
  the 
  pleon 
  resembles 
  that 
  of 
  the 
  cara- 
  

   pace, 
  inasmuch 
  as 
  it 
  varies 
  from 
  being 
  feebly 
  punctate 
  to 
  

   coarsely 
  reticulate. 
  Inferior 
  lateral 
  margins 
  from 
  the 
  first 
  to 
  

   the 
  fifth 
  inclusive 
  raised. 
  Posterior 
  lateral 
  border 
  of 
  the 
  

   second 
  rounded, 
  of 
  the 
  third, 
  fourth, 
  and 
  fifth 
  becoming 
  pro- 
  

   gressively 
  more 
  angulated 
  from 
  before 
  backwards. 
  

  

  First 
  pleopod 
  in 
  the 
  female 
  terminating 
  in 
  two 
  slender 
  

   pointed 
  processes, 
  above 
  which 
  the 
  appendage 
  is 
  lamelliform 
  

   and 
  furnished 
  with 
  a 
  fringe 
  of 
  hairs 
  ; 
  in 
  the 
  male 
  the 
  endo- 
  

   podite 
  and 
  exopodite 
  are 
  well 
  developed 
  and 
  subequal. 
  The 
  

   second, 
  third, 
  fourth, 
  and 
  fifth 
  pleopoda 
  in 
  the 
  female 
  are 
  

   alike, 
  with 
  ovate, 
  foliaceous, 
  hairy 
  exopodites 
  and 
  similar 
  but 
  

   smaller 
  endopodites, 
  from 
  the 
  base 
  of 
  which 
  on 
  the 
  inner 
  

   side 
  of 
  each 
  appendage 
  springs 
  a 
  short 
  styliform 
  process, 
  

   which, 
  joining 
  with 
  that 
  of 
  the 
  opposite 
  side, 
  yokes 
  the 
  appen- 
  

   dages 
  together 
  in 
  the 
  middle 
  line. 
  The 
  third, 
  fourth, 
  and 
  

   fifth 
  pleopoda 
  of 
  the 
  male 
  resemble 
  those 
  just 
  described, 
  but 
  

   the 
  second 
  differs 
  in 
  that 
  the 
  endopodite 
  bears 
  on 
  its 
  inner 
  

   side 
  a 
  widened, 
  hairy, 
  not 
  to 
  say 
  spinous 
  lamina. 
  Between 
  

   the 
  pleopoda 
  of 
  the 
  fifth 
  abdominal 
  somite 
  there 
  may 
  be 
  a 
  

   larger 
  or 
  smaller 
  median 
  spine, 
  and 
  between 
  those 
  of 
  the 
  sixth 
  

   there 
  is 
  a 
  larger 
  hooked 
  process. 
  In 
  the 
  sixth 
  pleopoda 
  the 
  

   exopodites 
  are 
  broad, 
  foliaceous, 
  and 
  fringed 
  with 
  hairs 
  ; 
  the 
  

   external 
  half 
  of 
  the 
  distal 
  edge 
  of 
  the 
  proximal 
  segment 
  finely 
  

   spined; 
  the 
  endopodite 
  resembles 
  the 
  exopodite, 
  does 
  not 
  

   project 
  beyond 
  it, 
  but 
  consists 
  of 
  one 
  lamina, 
  has 
  no 
  spines, 
  

   and 
  is 
  slightly 
  narrower 
  ; 
  the 
  basal 
  segment 
  is 
  furnished 
  

  

  