﻿230 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  44. 
  

  

  LERNANTHROPUS 
  FRONDEUS, 
  new 
  species. 
  

   Plate 
  36. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  Ten 
  specimens, 
  containing 
  both 
  

   sexes, 
  were 
  obtained 
  from 
  the 
  gills 
  of 
  the 
  red 
  snapper, 
  Neomxnis 
  aya, 
  

   on 
  July 
  16, 
  1910. 
  

  

  Type-specimen. 
  — 
  A 
  female, 
  Cat. 
  No. 
  43520, 
  U.S.N.M. 
  Paratypes, 
  

   Cat. 
  No. 
  42287, 
  U.S.N.M. 
  

  

  Female. 
  — 
  General 
  body 
  form 
  elongate, 
  narrowed 
  anteriorly 
  and 
  

   widened 
  posteriorly; 
  cephalothorax 
  ovate, 
  less 
  than 
  one-third 
  the 
  

   length 
  of 
  the 
  body 
  exclusive 
  of 
  the 
  legs, 
  and 
  about 
  the 
  same 
  width 
  

   as 
  the 
  second 
  and 
  third 
  thorax 
  segments. 
  Carapace 
  projecting 
  

   neither 
  along 
  the 
  lateral 
  margins 
  nor 
  in 
  front, 
  leaving 
  the 
  first 
  and 
  

   second 
  antennae 
  entirely 
  visible 
  in 
  dorsal 
  view. 
  Second 
  and 
  third 
  

   thorax 
  segments 
  separated 
  by 
  a 
  distinct 
  groove, 
  the 
  former 
  short 
  with 
  

   strongly 
  convex 
  margins, 
  the 
  latter 
  twice 
  as 
  long 
  with 
  nearly 
  straight 
  

   margins. 
  Dorsal 
  plate 
  of 
  the 
  fourth 
  segment 
  broadly 
  kidney-shaped, 
  

   nearly 
  twice 
  the 
  width 
  of 
  the 
  third 
  segment, 
  with 
  a 
  very 
  evenly 
  curved 
  

   outline. 
  Fifth 
  and 
  genital 
  segments 
  and 
  abdomen 
  so 
  short 
  as 
  to 
  be 
  

   considerably 
  wider 
  than 
  long, 
  but 
  well 
  defined 
  and 
  separated 
  from 
  

   one 
  another 
  by 
  grooves. 
  Anal 
  laminae 
  much 
  enlarged 
  and 
  foliaceous, 
  

   each 
  being 
  half 
  as 
  wide 
  again, 
  and 
  more 
  than 
  five 
  times 
  as 
  long, 
  as 
  the 
  

   abdomen. 
  Egg-strings 
  narrow 
  and 
  tapering 
  posteriorly, 
  nearly 
  twice 
  

   as 
  long 
  as 
  the 
  body; 
  eggs 
  thin 
  and 
  numerous. 
  

  

  First 
  antennse 
  small 
  but 
  prominent, 
  seven-jointed; 
  antennal 
  area 
  

   wide 
  and 
  separated 
  from 
  the 
  rest 
  of 
  the 
  head 
  by 
  a 
  well-defined 
  groove 
  ; 
  

   second 
  antennse 
  stout, 
  the 
  basal 
  joint 
  considerably 
  longer 
  than 
  the 
  

   terminal 
  claw, 
  and 
  carrying 
  on 
  its 
  inner 
  margin 
  near 
  the 
  center 
  a 
  

   small 
  papilla 
  tipped 
  with 
  a 
  hair-like 
  spine. 
  First 
  maxillae 
  stout, 
  the 
  

   terminal 
  joint 
  as 
  thickset 
  as 
  the 
  basal 
  and 
  tipped 
  with 
  three 
  spines, 
  

   the 
  central 
  one 
  of 
  which 
  is 
  longer 
  than 
  the 
  other 
  two. 
  Second 
  

   maxillae 
  with 
  a 
  slender 
  terminal 
  claw, 
  the 
  same 
  length 
  as 
  the 
  swollen 
  

   basal 
  joint 
  and 
  slightly 
  enlarged 
  at 
  the 
  tip. 
  Basal 
  joint 
  of 
  maxilli- 
  

   peds 
  much 
  swollen, 
  terminal 
  claw 
  conical 
  and 
  shorter 
  than 
  the 
  basal 
  

   joint. 
  Exopods 
  of 
  first 
  two 
  pairs 
  of 
  legs 
  wider 
  than 
  the 
  conical 
  endo- 
  

   pods 
  and 
  considerably 
  flattened; 
  first 
  exopod 
  armed 
  with 
  five 
  short 
  

   and 
  stout 
  spines 
  ; 
  second 
  exopod 
  with 
  three 
  spines 
  and 
  two 
  short 
  teeth 
  

   on 
  the 
  outer 
  margin. 
  Each 
  endopod 
  carries 
  a 
  single 
  long 
  and 
  stout 
  

   spine. 
  

  

  Third 
  legs 
  uniramose, 
  each 
  shaped 
  like 
  an 
  ovate 
  leaf 
  with 
  an 
  

   acuminate 
  tip 
  ; 
  each 
  leg 
  is 
  three-fourths 
  as 
  wide 
  as 
  the 
  third 
  segment 
  

   itself, 
  and 
  as 
  they 
  do 
  not 
  overlap 
  on 
  the 
  midline 
  it 
  follows 
  that 
  they 
  

   project 
  from 
  the 
  lateral 
  margins 
  of 
  the 
  third 
  segment 
  even 
  beyond 
  

   the 
  level 
  of 
  the 
  dorsal 
  plate 
  on 
  the 
  fourth 
  segment. 
  Fifth 
  legs 
  also 
  

  

  