﻿644 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [40] 
  

  

  Specimens 
  examined 
  — 
  Continued. 
  

   [Locality 
  : 
  Off 
  Chesapeake 
  Bay.] 
  

  

  [Locality: 
  Off 
  Cape 
  Hatteras.] 
  

  

  Munidopsis 
  Whiteaves. 
  

  

  Amer. 
  Jour. 
  Sci., 
  Ill, 
  vii, 
  p. 
  212, 
  1874 
  ; 
  Smith, 
  Proc. 
  National 
  Museum, 
  vii, 
  

   p. 
  493, 
  1885. 
  

  

  As 
  I 
  have 
  stated 
  in 
  a 
  paper 
  referred 
  to 
  above, 
  a 
  careful 
  examination 
  

   of 
  the 
  structural 
  characters 
  of 
  the 
  type 
  species 
  of 
  this 
  genus 
  with 
  A. 
  

   Milne-Edwards's 
  Qalacantha 
  rostrata, 
  niy 
  G. 
  Bairdii, 
  and 
  the 
  two 
  species 
  

   here 
  described, 
  induces 
  me 
  to 
  refer 
  them 
  all 
  to 
  a 
  single 
  genus. 
  The 
  

   oral 
  appendages 
  are 
  almost 
  exactly 
  alike 
  in 
  all 
  the 
  species, 
  except 
  un- 
  

   essential 
  differences 
  in 
  the 
  armament 
  of 
  the 
  second 
  gnathopods. 
  The 
  

   number 
  and 
  arrangement 
  of 
  the 
  branchiae 
  are 
  the 
  same 
  in 
  all, 
  and 
  like 
  

   that 
  in 
  the 
  typical 
  species 
  of 
  Munida, 
  though 
  the 
  number 
  of 
  epipods 
  

   varies. 
  In 
  Munidopsis 
  curvirostra 
  and 
  Bairdii 
  there 
  are 
  only 
  two 
  epi- 
  

   pods 
  on 
  each 
  side, 
  as 
  in 
  the 
  typical 
  species 
  of 
  Munida, 
  one 
  at 
  the 
  base 
  

   of 
  the 
  maxilliped 
  and 
  the 
  other 
  at 
  the 
  base 
  of 
  the 
  second 
  gnathopod 
  ; 
  

   in 
  Munidopsis 
  crassa 
  and 
  similis 
  there 
  is 
  an 
  additional 
  pair 
  at 
  the 
  base 
  

   of 
  the 
  first 
  peraeopod 
  ; 
  while 
  in 
  Munidopsis 
  rostrata 
  there 
  are 
  additional 
  

   ones 
  at 
  the 
  bases 
  of 
  each 
  of 
  the 
  first 
  three 
  pairs 
  of 
  peraeopods. 
  The 
  

   eyes 
  in 
  Munidopsis 
  Bairdii, 
  crassa, 
  and 
  similis 
  are 
  much 
  alike 
  and 
  con- 
  

   siderably 
  different 
  from 
  those 
  of 
  the 
  other 
  species, 
  but 
  it 
  does 
  not 
  seem 
  

   desirable 
  to 
  consider 
  such 
  differences 
  or 
  those 
  in 
  the 
  number 
  of 
  epipods 
  

   as 
  of 
  generic 
  value. 
  

  

  