﻿NO. 
  1950. 
  CRUSTACEAN 
  PARASITES 
  OF 
  /'7.«?// 
  AND 
  CRABS— 
  WILSON. 
  223 
  

  

  Plrst 
  antennae 
  short, 
  the 
  tips 
  scarcely 
  reaching 
  beyond 
  the 
  free 
  edge 
  

   of 
  the 
  carapace; 
  terminal 
  joint 
  slender 
  and 
  considerably 
  longer 
  than 
  

   the 
  basal. 
  Second 
  antennae 
  stout, 
  the 
  terminal 
  claw 
  bent 
  abruptly 
  

   near 
  the 
  tip; 
  maxillary 
  hooks 
  small 
  and 
  not 
  much 
  curved. 
  Mouth 
  

   tube 
  short 
  and 
  blunt; 
  first 
  maxillae 
  some 
  distance 
  behind 
  the 
  mouth, 
  

   long, 
  slender, 
  and 
  undivided; 
  maxiUiped 
  with 
  a 
  moderately 
  stout 
  

   basal 
  joint, 
  and 
  a 
  slender 
  terminal 
  claw, 
  half 
  as 
  long 
  as 
  the 
  basal 
  

   joint, 
  and 
  with 
  an 
  accessory 
  spine 
  on 
  its 
  inner 
  margin 
  near 
  the 
  center. 
  

  

  First 
  legs 
  with 
  no 
  trace 
  of 
  an 
  endopod 
  and 
  with 
  short 
  setae 
  on 
  the 
  

   terminal 
  joint; 
  spines 
  on 
  the 
  exopods 
  of 
  the 
  second 
  legs 
  long 
  and 
  

   stout; 
  rami 
  of 
  third 
  legs 
  close 
  together, 
  spine 
  on 
  the 
  base 
  of 
  the 
  

   exopod 
  also 
  long 
  and 
  stout; 
  basal 
  joint 
  of 
  the 
  fourth 
  legs 
  the 
  same 
  

   length 
  as 
  the 
  three 
  terminal 
  joints, 
  inner 
  terminal 
  seta 
  twice 
  the 
  

   length 
  of 
  the 
  outer 
  and 
  all 
  three 
  terminal 
  ones 
  toothed. 
  

  

  Color, 
  a 
  yellowish-gray, 
  becoming 
  dark 
  cinnamon-brown 
  in 
  the 
  

   thicker 
  parts 
  of 
  the 
  body. 
  

  

  Total 
  length, 
  3.6 
  mm. 
  Carapace, 
  2.55 
  mm. 
  long 
  and 
  wide. 
  Fused 
  

   fourth, 
  fifth, 
  and 
  genital 
  segments, 
  0.8 
  mm, 
  long, 
  1,6 
  mm, 
  wide. 
  

  

  {curtus, 
  shortened 
  with 
  the 
  idea 
  of 
  being 
  mutilated, 
  the 
  body 
  

   looking 
  as 
  if 
  some 
  of 
  the 
  posterior 
  part 
  had 
  been 
  cut 
  off.) 
  

  

  Although 
  no 
  specimens 
  of 
  this 
  new 
  genus 
  have 
  yet 
  been 
  obtained 
  

   from 
  the 
  West 
  Indies, 
  it 
  is 
  almost 
  certain 
  that 
  it 
  will 
  be 
  found 
  there, 
  

   because 
  its 
  host 
  is 
  even 
  more 
  common 
  there 
  than 
  around 
  Bermuda, 
  

   and 
  is 
  found 
  as 
  far 
  south 
  as 
  Brazil, 
  There 
  is 
  therefore 
  every 
  reason 
  

   why 
  it 
  should 
  be 
  included 
  in 
  the 
  present 
  list 
  of 
  parasites. 
  

  

  ANURETES 
  PARVULUS, 
  new 
  species, 
  

   Plate 
  33, 
  figs. 
  139-147. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  A 
  single 
  female 
  of 
  this 
  interesting 
  

   species 
  was 
  obtained 
  by 
  Dr. 
  Edwin 
  Linton 
  from 
  the 
  gills 
  of 
  a 
  black 
  

   angel 
  fish, 
  Pomacanthus 
  arcuatus, 
  at 
  the 
  Marine 
  Laboratory 
  of 
  the 
  

   Carnegie 
  Institution 
  at 
  the 
  Dry 
  Tortugas, 
  Florida, 
  July 
  15, 
  1907. 
  

  

  Type-specimen 
  —Csit. 
  No. 
  42275, 
  U.S,N,M. 
  

  

  Female. 
  — 
  Cephalothorax 
  ovate, 
  slightly 
  longer 
  than 
  wide, 
  squarely 
  

   truncated 
  posteriorly; 
  frontal 
  plates 
  well 
  fused 
  with 
  the 
  head, 
  and 
  

   furnished 
  with 
  a 
  broad, 
  transparent 
  chitinous 
  margin 
  which 
  evidently 
  

   functions 
  as 
  a 
  sucking 
  disk. 
  The 
  groove 
  at 
  the 
  crossbar 
  of 
  the 
  H 
  

   visible 
  at 
  the 
  sides 
  only, 
  eliminated 
  at 
  the 
  center; 
  lateral 
  areas 
  

   narrow; 
  thoracic 
  area 
  half 
  of 
  an 
  ellipse, 
  one-third 
  wider 
  than 
  long, 
  a 
  

   little 
  more 
  than 
  half 
  the 
  width 
  of 
  the 
  cephalothorax, 
  the 
  posterior 
  

   margin 
  a 
  straight 
  line 
  connecting 
  the 
  tips 
  of 
  the 
  lateral 
  lobes; 
  poste- 
  

   rior 
  sinuses 
  mere 
  notches, 
  scarcely 
  visible. 
  

  

  Fourth 
  (free) 
  segment 
  one-fifth 
  the 
  width 
  of 
  the 
  carapace, 
  con- 
  

   siderably 
  thickened 
  through 
  the 
  bases 
  of 
  the 
  fourth 
  legs. 
  Genital 
  

   segment 
  as 
  wide 
  as 
  long, 
  the 
  same 
  shape 
  as 
  the 
  carapace 
  and 
  half 
  as 
  

  

  