﻿NO. 
  1950. 
  CRUSTACEAN 
  PARASITES 
  OF 
  FISH 
  AND 
  CRABS— 
  WILSON. 
  261 
  

  

  investigators. 
  Kr0yer's 
  description 
  lacks 
  practically 
  all 
  the 
  details 
  

   with 
  reference 
  to 
  the 
  appendages 
  and 
  his 
  figures 
  are 
  so 
  small 
  that 
  

   nothing 
  can 
  be 
  learned 
  from 
  them 
  about 
  the 
  appendages. 
  Accord- 
  

   ingly 
  the 
  species 
  has 
  been 
  redescribed, 
  the 
  details 
  of 
  structure 
  have 
  

   been 
  added, 
  and 
  the 
  male 
  and 
  nauplius 
  larva 
  have 
  been 
  presented 
  

   for 
  the 
  first 
  time. 
  

  

  This 
  male 
  proves 
  to 
  be 
  a 
  typical 
  Clavella 
  (Ancliorella) 
  form, 
  so 
  

   that 
  Kr0yer 
  located 
  the 
  species 
  correctly 
  in 
  spite 
  of 
  the 
  presence 
  

   of 
  three 
  pairs 
  of 
  posterior 
  processes 
  around 
  the 
  egg-strings 
  that 
  

   might 
  have 
  suggested 
  a 
  relationship 
  to 
  Brachiella. 
  

  

  The 
  nauplius 
  larva 
  was 
  dissected 
  out 
  of 
  the 
  egg-strings 
  and 
  com- 
  

   pares 
  closely 
  with 
  that 
  obtained 
  in 
  a 
  similar 
  manner 
  from 
  the 
  egg- 
  

   strmgs 
  of 
  Achtheres 
  amhloplitis} 
  

  

  The 
  species 
  may 
  be 
  recognized 
  by 
  the 
  bell-shaped 
  posterior 
  body, 
  

   with 
  the 
  conical 
  processes 
  around 
  its 
  flaring 
  mouth, 
  and 
  the 
  short 
  

   and 
  thickset 
  egg-cases 
  protruding 
  from 
  the 
  latter 
  like 
  a 
  pair 
  of 
  tongues 
  

   or 
  clappers. 
  

  

  CLAVELLA 
  INVERSA, 
  new 
  species. 
  

   Plate 
  50. 
  

  

  Host 
  and 
  record 
  of 
  specim 
  ens. 
  —Si:^ 
  females 
  were 
  obtained 
  from 
  

   the 
  gills 
  of 
  the 
  red-mouthed 
  grunt, 
  Bathystoma 
  rimator, 
  July 
  18, 
  1910. 
  

  

  Type-specimen.— 
  Qoi. 
  No. 
  43513, 
  U.S.N.M. 
  Paratypes, 
  Cat. 
  No. 
  

   42291, 
  U.S.N.M. 
  

  

  Female.— 
  GewQvaX 
  body 
  form 
  short 
  and 
  very 
  thickset. 
  Cephalo- 
  

   thorax 
  flexed 
  backward 
  so 
  that 
  it 
  is 
  in 
  the 
  same 
  line 
  with 
  the 
  arms 
  

   and 
  at 
  right 
  angles 
  to 
  the 
  rest 
  of 
  the 
  body. 
  Head 
  club-shaped, 
  

   its 
  diameter 
  a 
  little 
  less 
  than 
  that 
  of 
  the 
  neck, 
  its 
  anterior 
  margin 
  

   squarely 
  truncated, 
  with 
  the 
  proboscis 
  and 
  first 
  antennae 
  projecting^ 
  

   slightly. 
  At 
  the 
  junction 
  of 
  the 
  neck 
  with 
  the 
  posterior 
  body, 
  wliich 
  

   is 
  also 
  the 
  point 
  from 
  whence 
  arise 
  the 
  arms 
  or 
  second 
  maxillae, 
  

   there 
  is 
  present 
  on 
  each 
  lateral 
  margin 
  and 
  nearer 
  the 
  dorsal 
  than 
  

   the 
  ventral 
  surface 
  a 
  large 
  kidney-shaped 
  knob. 
  These 
  knobs 
  are 
  

   very 
  conspicuous 
  in 
  both 
  living 
  and 
  preserved 
  specimens 
  and 
  furnish 
  

   a 
  ready 
  means 
  of 
  recognizing 
  the 
  species. 
  So 
  far 
  as 
  is 
  known, 
  

   nothing 
  of 
  this 
  sort 
  has 
  ever 
  been 
  observed 
  in 
  any 
  other 
  species 
  of 
  

   the 
  genus. 
  The 
  knobs 
  are 
  covered 
  with 
  the 
  outer 
  skin 
  so 
  thicklg^ 
  

   that 
  their 
  presence 
  is 
  indicated 
  merely 
  by 
  a 
  wrinkled 
  swelling, 
  but, 
  

   the 
  skin 
  being 
  transparent, 
  they 
  are 
  perfectly 
  visible 
  inside 
  the 
  swell- 
  

   ing. 
  They 
  appear 
  to 
  be 
  the 
  maxillary 
  glands, 
  crowded 
  out 
  of 
  their 
  

   normal 
  position 
  in 
  the 
  second 
  maxillae, 
  for 
  ducts 
  may 
  be 
  seen 
  on 
  

   their 
  dorsal 
  surface 
  leading 
  inward 
  and 
  upward 
  and 
  openmg 
  at 
  the 
  

   base 
  of 
  the 
  second 
  maxillae. 
  The 
  latter 
  are 
  short 
  and 
  completely 
  

   fused, 
  except 
  the 
  internal 
  muscles, 
  wliich 
  still 
  indicate 
  their 
  double 
  

   origin. 
  The 
  attachment 
  bulla 
  is 
  large, 
  saucershaped, 
  and 
  sessile, 
  

   with 
  the 
  stem 
  entirely 
  lacking. 
  

  

  ■-Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  39, 
  pi. 
  30, 
  figs. 
  10 
  and 
  11. 
  

  

  