﻿NO. 
  1950. 
  CRUSTACEAX 
  PARASITES 
  OF 
  FISH 
  AND 
  CRABS— 
  WIL80X. 
  245 
  

  

  (uncatus, 
  bent 
  inward 
  or 
  curved 
  like 
  an 
  anchor, 
  alluding 
  to 
  the 
  

   egg-cases.) 
  

  

  During 
  the 
  observation 
  of 
  these 
  specimens 
  while 
  still 
  alive 
  it 
  was 
  

   noted 
  that 
  the 
  usual 
  peristaltic 
  movements 
  of 
  the 
  stomach 
  and 
  intes- 
  

   tine 
  were 
  assisted 
  by 
  the 
  drawing 
  forward 
  and 
  backward 
  of 
  the 
  ovi- 
  

   duct 
  on 
  either 
  side 
  alternately. 
  This 
  movement 
  was 
  rhythmic 
  and 
  

   each 
  oviduct 
  was 
  pulled 
  nearly 
  to 
  the 
  narrow 
  neck 
  between 
  the 
  head 
  

   and 
  first 
  thorax 
  segment. 
  

  

  The 
  species 
  can 
  be 
  told 
  readily 
  by 
  the 
  comparatively 
  large 
  size 
  and 
  

   small 
  number 
  of 
  eggs 
  and 
  by 
  the 
  pecuUar 
  position 
  of 
  the 
  egg-strings. 
  

   In 
  no 
  other 
  known 
  species 
  are 
  they 
  any 
  more 
  than 
  divergent 
  and 
  

   pointing 
  backward 
  ; 
  here 
  the}^ 
  actually 
  point 
  forward. 
  

  

  HATSCHEKIA 
  INSOLITA, 
  new 
  species. 
  

  

  Plate 
  42, 
  figs. 
  227-2.32. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  Twenty 
  females 
  belonging' 
  to 
  this 
  

   species 
  were 
  obtained 
  from 
  the 
  gills 
  of 
  the 
  rock 
  hind, 
  Epineplielus 
  

   adscensionis, 
  during 
  the 
  summer. 
  There 
  were 
  never 
  more 
  than 
  one 
  

   or 
  two 
  on 
  a 
  single 
  fish, 
  sometimes 
  alone, 
  sometimes 
  m 
  company 
  with 
  

   the 
  preceding 
  species 
  (uncata). 
  The 
  present 
  species 
  was 
  in 
  full 
  view 
  

   while 
  uncata 
  was 
  hidden 
  between 
  the 
  filaments. 
  

  

  Type-specimen.— 
  Cat. 
  No. 
  43549, 
  U.S.N.M. 
  Paratypes, 
  Cat. 
  No. 
  

   42336, 
  U.S.N.M. 
  

  

  Female. 
  — 
  Body 
  of 
  medium 
  length 
  and 
  rather 
  wide; 
  carapace 
  large 
  

   and 
  nearly 
  circular, 
  but 
  with 
  an 
  irregular 
  outline, 
  and 
  about 
  one-third 
  

   the 
  entire 
  length 
  ; 
  dorsal 
  median 
  rib 
  or 
  keel 
  of 
  the 
  carapace 
  well 
  devel- 
  

   oped. 
  First 
  and 
  second 
  thorax 
  segments 
  forming 
  a 
  short 
  neck 
  joining 
  

   the 
  carapace 
  with 
  the 
  rest 
  of 
  the 
  segments. 
  Fused 
  thorax 
  club- 
  

   shaped, 
  one-half 
  longer 
  than 
  wide, 
  with 
  the 
  segmentation 
  clearly 
  indi- 
  

   cated 
  on 
  the 
  lateral 
  margins; 
  fifth 
  segment 
  with 
  posterior 
  lobes 
  each 
  

   as 
  broad 
  as 
  the 
  fused 
  sixth 
  segment 
  and 
  abdomen 
  and 
  reaching 
  back 
  

   farther 
  than 
  the 
  latter. 
  Fused 
  sixth 
  segment 
  and 
  abdomen 
  only 
  one- 
  

   sixth 
  the 
  width 
  of 
  the 
  fourth 
  segment, 
  hemispherical, 
  and 
  sHghtly 
  

   contracted 
  where 
  it 
  joins 
  the 
  fifth 
  segment. 
  Anal 
  laminae 
  long 
  and 
  

   narrow, 
  apparently 
  two-jointed, 
  the 
  terminal 
  joint 
  tipped 
  with 
  three 
  

   setae. 
  

  

  Egg-cases 
  club-shaped, 
  from 
  two-thirds 
  to 
  three-quarters 
  the 
  length 
  

   of 
  the 
  body 
  and 
  taken 
  together 
  as 
  wide 
  as 
  the 
  fifth 
  segment; 
  eggs 
  of 
  

   large 
  size, 
  from 
  foiu" 
  to 
  seven 
  m 
  each 
  case. 
  

  

  First 
  antemise 
  long 
  and 
  narrow, 
  about 
  the 
  same 
  diameter 
  through- 
  

   out 
  and 
  poorly 
  armed 
  with 
  spines. 
  Second 
  pair 
  with 
  a 
  stout 
  basal 
  

   joint 
  which 
  is 
  a 
  Uttle 
  longer 
  than 
  the 
  entire 
  first 
  antenna 
  and 
  armed 
  

   with 
  strong 
  muscles. 
  Terminal 
  claw 
  weak, 
  abruptly 
  narrowed 
  to 
  less 
  

   than 
  one-fifth 
  the 
  diameter 
  of 
  the 
  basal 
  joint, 
  bent 
  sharply 
  at 
  a 
  right 
  

   angle 
  close 
  to 
  the 
  base, 
  and 
  tapered 
  to 
  a 
  fine 
  needle 
  point. 
  In 
  fact, 
  

  

  