﻿252 
  PROCEEDiyaS 
  of 
  the 
  XATIONAL 
  museum. 
  vol.44. 
  

  

  LERN.«;OLOPHUS 
  RECURVUS. 
  new 
  species. 
  

   Plate 
  46. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  Four 
  females, 
  one 
  of 
  which 
  was 
  a 
  

   young 
  developmental 
  stage, 
  were 
  obtained 
  from 
  the 
  gill 
  arches 
  of 
  

   the 
  blue 
  parrot 
  fish, 
  Scarus 
  cseruleus, 
  June 
  30, 
  1910. 
  Three 
  of 
  these 
  

   were 
  found 
  upon 
  a 
  single 
  fish, 
  and 
  were 
  close 
  together 
  in 
  the 
  floor 
  

   of 
  the 
  throat, 
  where 
  the 
  gill 
  arches 
  join. 
  

  

  Type-specimen. 
  — 
  Cat. 
  No. 
  43557, 
  U.S.N.M. 
  Paratypes, 
  Cat. 
  No. 
  

   42292, 
  U.S.N.M. 
  

  

  Female. 
  — 
  General 
  body 
  form 
  slender, 
  the 
  head 
  nearly 
  spherical 
  

   and 
  about 
  twice 
  the 
  diameter 
  of 
  the 
  neck, 
  the 
  posterior 
  body 
  club- 
  

   shaped 
  but 
  not 
  much 
  enlarged, 
  the 
  abdomen 
  narrowed 
  to 
  half 
  the 
  

   diameter 
  of 
  the 
  genital 
  segment. 
  Body 
  also 
  bent 
  into 
  a 
  half 
  circle 
  

   so 
  that 
  the 
  genital 
  segment 
  and 
  abdomen 
  point 
  forward 
  toward 
  the 
  

   head. 
  In 
  fully 
  matured 
  specimens 
  the 
  abdomen 
  is 
  covered 
  vdih 
  a 
  

   dense 
  growth 
  of 
  dichotomous 
  processes. 
  

  

  Head 
  flattened 
  a 
  little 
  dorso-ventrally, 
  and 
  armed 
  on 
  its 
  dorsal 
  

   surface 
  with 
  three 
  chitin 
  horns, 
  all 
  at 
  right 
  angles 
  to 
  the 
  body 
  axis 
  

   and 
  dichotomously 
  branched. 
  The 
  two 
  lateral 
  horns 
  are 
  consider- 
  

   ably 
  larger 
  than 
  the 
  posterior 
  one, 
  their 
  length 
  being 
  three 
  or 
  foiw 
  

   times 
  the 
  diameter 
  of 
  the 
  head, 
  and 
  are 
  three 
  times 
  compounded. 
  

   The 
  posterior 
  horn 
  is 
  much 
  shorter, 
  its 
  length 
  only 
  once 
  and 
  a 
  half 
  

   times 
  the 
  diameter 
  of 
  the 
  head, 
  and 
  is 
  only 
  twice 
  compounded. 
  

   Usually 
  one 
  or 
  the 
  other 
  lateral 
  horn 
  is 
  enlarged 
  at 
  the 
  base, 
  and 
  

   the 
  branches 
  of 
  all 
  the 
  horns 
  taper 
  regularly 
  toward 
  the 
  tips. 
  

  

  There 
  is 
  hardly 
  a 
  trace 
  of 
  the 
  two 
  small 
  knobs 
  on 
  the 
  top 
  of 
  the 
  

   head, 
  which 
  represent 
  the 
  first 
  antennas 
  in 
  L. 
  sultanus. 
  

  

  On 
  the 
  flattened 
  ventral 
  surface, 
  or 
  face 
  of 
  the 
  head, 
  may 
  be 
  found 
  

   the 
  second 
  antennae 
  and 
  mouth 
  parts. 
  The 
  former 
  are 
  in 
  the 
  shape 
  

   of 
  short 
  and 
  stumpy 
  processes 
  along 
  what 
  may 
  be 
  called 
  the 
  fore- 
  

   head 
  of 
  the 
  parasite 
  and 
  down 
  either 
  side 
  of 
  the 
  face. 
  Each 
  con- 
  

   sists 
  of 
  two 
  parts 
  which 
  evidently 
  belong 
  together 
  and 
  which 
  are 
  

   united 
  in 
  early 
  development, 
  but 
  become 
  more 
  or 
  less 
  separated 
  later. 
  

   Behind 
  these 
  on 
  the 
  lower 
  sides 
  of 
  the 
  face 
  and 
  along 
  the 
  chin 
  are 
  the 
  

   maxillipeds, 
  also 
  represented 
  by 
  stumpy 
  processes, 
  flattened 
  and 
  

   irregular, 
  and 
  showing 
  more 
  or 
  less 
  tendency 
  to 
  become 
  bipartite. 
  

   The 
  space 
  between 
  the 
  second 
  antennae 
  and 
  maxillipeds 
  is 
  hollowed 
  

   out 
  into 
  a 
  shallow 
  cup, 
  in 
  the 
  bottom 
  of 
  which 
  are 
  three 
  small 
  spher- 
  

   ical 
  knobs 
  of 
  about 
  the 
  same 
  size, 
  one 
  posterior 
  on 
  the 
  median 
  line, 
  

   and 
  in 
  front 
  of 
  this 
  a 
  pair, 
  one 
  on 
  either 
  side 
  of 
  the 
  median 
  line. 
  

   The 
  former 
  is 
  the 
  rudiment 
  of 
  the 
  under 
  lip, 
  the 
  latter 
  of 
  the 
  man-, 
  

   dibles. 
  

  

  In 
  front 
  of 
  the 
  mandibles 
  in 
  some 
  of 
  the 
  specimens 
  may 
  be 
  seen 
  a 
  

   shght 
  elevation 
  on 
  the 
  median 
  line 
  which 
  represents 
  the 
  last 
  traces 
  

   of 
  the 
  upper 
  lip. 
  In 
  the 
  developmental 
  stage 
  the 
  upper 
  and 
  under 
  

  

  