﻿262 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  Tlie 
  posterior 
  body 
  is 
  transversely 
  elliptical, 
  a 
  trifle 
  wider 
  than 
  

   long, 
  with 
  a 
  strongly 
  convex 
  ventral 
  surface 
  and 
  an 
  equally 
  con- 
  

   cave 
  dorsal 
  surface. 
  At 
  the 
  center 
  of 
  th(^ 
  posterior 
  margin, 
  on 
  a 
  

   level 
  with 
  the 
  ventral 
  surface, 
  is 
  the 
  tiny 
  abdomen, 
  which 
  is 
  short, 
  

   obovate, 
  and 
  strongly 
  flattened 
  dorso-ventrally. 
  

  

  The 
  egg-strings 
  are 
  ellipsoidal, 
  each 
  three-fourths 
  as 
  long 
  as 
  the 
  

   posterior 
  body 
  and 
  half 
  as 
  wide; 
  the 
  eggs 
  are 
  very 
  large 
  and 
  are 
  

   arranged 
  in 
  six 
  or 
  seven 
  rows, 
  about 
  five 
  in 
  a 
  row. 
  

  

  First 
  antennae 
  three-jointed, 
  the 
  two 
  termuial 
  joints 
  slender, 
  

   tipped 
  with 
  two 
  short 
  spines, 
  and 
  projecting 
  well 
  beyond 
  the 
  ante- 
  

   rior 
  margin 
  of 
  the 
  head, 
  the 
  basal 
  joint 
  swollen 
  and 
  armed 
  with 
  a 
  

   suigle 
  spine 
  on 
  the 
  inner 
  margin 
  near 
  the 
  distal 
  end. 
  Second 
  antennae 
  

   flexed 
  at 
  a 
  right 
  angle 
  and 
  appressed 
  close 
  to 
  the 
  anterior 
  margui 
  

   of 
  the 
  head,* 
  their 
  tips 
  meeting 
  at 
  the 
  midline. 
  Proboscis 
  broadly 
  

   conical, 
  its 
  tip 
  reachmg 
  a 
  little 
  beyond 
  the 
  frontal 
  margin. 
  First 
  

   maxillaj 
  ending 
  in 
  two 
  spmes 
  of 
  about 
  equal 
  size; 
  palp 
  also 
  tipped 
  

   with 
  two 
  small 
  and 
  equal 
  spmes 
  and 
  situated 
  on 
  the 
  ventral 
  surface 
  

   near 
  the 
  center. 
  

  

  Maxillipeds 
  with 
  a 
  swollen 
  basal 
  joint, 
  armed 
  with 
  powerful 
  

   muscles, 
  having 
  a 
  stout 
  spine 
  at 
  the 
  center 
  of 
  the 
  mner 
  margm 
  

   and 
  a 
  rounded 
  elevation 
  covered 
  with 
  short 
  spiny 
  teeth 
  at 
  the 
  distal 
  

   end 
  of 
  the 
  same 
  margin. 
  Terminal 
  claw 
  slender 
  and 
  a 
  little 
  more 
  

   than 
  half 
  the 
  length 
  of 
  the 
  basal 
  joint, 
  with 
  a 
  short 
  accessory 
  spine 
  

   near 
  the 
  tip. 
  

  

  Color 
  a 
  clear 
  yellowish-white, 
  without 
  pigment. 
  

  

  Total 
  length, 
  3.45 
  mm. 
  Cephalothorax, 
  1.65 
  mm. 
  long, 
  0.6 
  mm. 
  

   wide. 
  Posterior 
  body, 
  1.75 
  mm. 
  long, 
  1.8 
  mm. 
  wide. 
  Egg-strings 
  

   1 
  mm. 
  long, 
  0.7 
  mm. 
  wide. 
  

  

  (inversus, 
  contrary 
  to 
  the 
  usual 
  order 
  of 
  things, 
  the 
  maxillary 
  

   glands 
  in 
  this 
  species 
  being 
  outside 
  the 
  maxillae.) 
  

  

  This 
  is 
  a 
  small 
  and 
  highly 
  interesting 
  species 
  which 
  may 
  be 
  recog- 
  

   nized 
  at 
  once 
  by 
  the 
  kidney-shaped 
  knobs 
  on 
  the 
  sides 
  of 
  the 
  cepha- 
  

   lothorax 
  at 
  the 
  bases 
  of 
  the 
  second 
  maxillae. 
  

  

  It 
  is 
  fairly 
  common, 
  having 
  been 
  found 
  on 
  several 
  of 
  the 
  red- 
  

   mouthed 
  grunts, 
  but 
  it 
  is 
  so 
  small 
  and 
  it 
  blends 
  so 
  well 
  witli 
  the 
  

   gill 
  filaments 
  that 
  it 
  is 
  easily 
  overlooked. 
  

  

  BRACHIELLA 
  CONCAVA, 
  new 
  species. 
  

   Plate 
  51, 
  figs. 
  284-288. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  A 
  single 
  female 
  of 
  this 
  species 
  was 
  

   taken 
  from 
  the 
  gills 
  of 
  the 
  sting 
  ray, 
  Dasyatis 
  hastata. 
  It 
  was 
  

   fastened 
  to 
  the 
  gill 
  arch 
  close 
  to 
  its 
  base 
  and 
  on 
  the 
  inner 
  margin 
  

   away 
  from 
  the 
  gill 
  filaments. 
  

  

  Type-specimen.— 
  Cat. 
  No. 
  42286, 
  U.S.N.M. 
  

  

  Female. 
  — 
  General 
  body 
  form 
  short 
  and 
  plump; 
  cephalothorax 
  

   folded 
  back 
  against 
  the 
  dorsal 
  body 
  surface 
  until 
  it 
  is 
  in 
  the 
  same 
  

  

  