﻿242 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  5. 
  Under 
  such 
  conditions 
  the 
  number 
  of 
  eggs 
  in 
  any 
  given 
  string 
  

   is 
  determined 
  at 
  the 
  beginning 
  by 
  the 
  size 
  of 
  the 
  original 
  case. 
  

  

  This 
  is 
  very 
  different 
  from 
  what 
  is 
  found 
  in 
  the 
  Caligidas, 
  where 
  

   there 
  are 
  partitions 
  between 
  the 
  individual 
  eggs, 
  or 
  in 
  the 
  Erga- 
  

   silidae, 
  where 
  the 
  eggs 
  ripen 
  individually 
  or 
  in 
  small 
  groups. 
  

  

  Probably 
  each 
  method 
  of 
  extrusion 
  is 
  more 
  or 
  less 
  characteristic 
  

   of 
  the 
  family 
  represented. 
  

  

  HATSCHEKIA 
  OBLONGA, 
  new 
  species. 
  

   Plate 
  42, 
  figs. 
  222-226. 
  

  

  Host 
  arid 
  record 
  of 
  specimens. 
  — 
  Ten 
  specimens 
  of 
  this 
  species 
  were 
  

   obtained 
  from 
  the 
  gills 
  of 
  the 
  red 
  snapper, 
  Neomsenis 
  aya, 
  all 
  females, 
  

   three 
  of 
  which 
  carried 
  egg-strings. 
  They 
  were 
  fastened 
  between 
  the 
  

   gill 
  filaments, 
  the 
  head 
  usually 
  on 
  the 
  inner 
  surface 
  of 
  the 
  filament, 
  

   and 
  the 
  body 
  at 
  right 
  angles 
  to 
  it. 
  While 
  fairly 
  common 
  they 
  were 
  not 
  

   at 
  all 
  numerous. 
  

  

  Type-specimen. 
  — 
  Cat. 
  No. 
  43554, 
  U.S.N.M. 
  Paratypes, 
  Cat. 
  No. 
  

   42319, 
  U.S.N.M. 
  

  

  Female. 
  — 
  General 
  body 
  form 
  oblong, 
  four 
  and 
  one-half 
  times 
  as 
  

   long 
  as 
  wide; 
  carapace 
  small, 
  one-fifth 
  of 
  the 
  entire 
  length, 
  trans- 
  

   versely 
  elliptical, 
  one-third 
  wider 
  than 
  long, 
  -vvith 
  very 
  evenly 
  curved 
  

   margins. 
  Fused 
  frontal 
  plates 
  also 
  transversely 
  elliptical 
  and 
  pro- 
  

   jecting 
  their 
  entire 
  length 
  from 
  the 
  frontal 
  margin. 
  Dorsal 
  median 
  

   carina 
  of 
  the 
  carapace 
  well 
  developed. 
  Fused 
  thorax 
  segments 
  

   cigar-shaped, 
  tapering 
  posteriori}^; 
  first 
  and 
  second 
  segments 
  forming 
  

   a 
  neck, 
  one-tliird 
  narrower 
  than 
  the 
  third 
  segment 
  and 
  connecting 
  

   the 
  latter 
  with 
  the 
  carapace. 
  Third, 
  fourth, 
  and 
  fifth 
  segments 
  

   indistinguishably 
  fused, 
  with 
  neither 
  marginal 
  indentations 
  nor 
  

   grooves; 
  fifth 
  segment 
  ending 
  in 
  a 
  blunt 
  lobe 
  on 
  either 
  side 
  of 
  the 
  

   sixth 
  segment. 
  The 
  latter 
  and 
  the 
  abdomen 
  semicircular, 
  two-fifths 
  

   the 
  width 
  of 
  the 
  fifth 
  segment; 
  anal 
  laminae 
  narrow-oblong, 
  each 
  

   tipped 
  with 
  two 
  minute 
  spines. 
  

  

  Egg-strings 
  half 
  the 
  length 
  of 
  the 
  body, 
  considerably 
  wider 
  than 
  

   the 
  genital 
  segment, 
  curved 
  like 
  parenthesis 
  marks, 
  and 
  each 
  con- 
  

   taining 
  about 
  15 
  eggs. 
  

  

  First 
  antennae 
  closely 
  appressed 
  to 
  the 
  anterior 
  margin 
  of 
  the 
  cara- 
  

   pace 
  and 
  scarcely 
  reaching 
  its 
  lateral 
  margin. 
  Second 
  pair 
  with 
  a 
  

   terminal 
  claw 
  half 
  the 
  length 
  of 
  the 
  slender 
  basal 
  joint, 
  and 
  bent 
  

   sharply 
  at 
  a 
  right 
  angle 
  close 
  to 
  its 
  base. 
  The 
  slender 
  second 
  and 
  

   third 
  joints 
  of 
  the 
  maxillipeds 
  are 
  together 
  about 
  the 
  same 
  length 
  

   as 
  the 
  much 
  stouter 
  basal 
  joint. 
  Each 
  of 
  the 
  swinoming 
  legs 
  has 
  a 
  

   short 
  and 
  -wide 
  basal 
  joint, 
  a 
  slender 
  two-jointed 
  exopod 
  tipped 
  with 
  

   two 
  spines, 
  and 
  a 
  stout 
  one-jointed 
  endopod 
  tipped 
  with 
  a 
  single 
  

   stout 
  spine; 
  each 
  basal 
  joint 
  carries 
  a 
  small 
  papilla, 
  tipped 
  with 
  

   a 
  stout 
  spine, 
  just 
  inside 
  the 
  base 
  of 
  the 
  endopod. 
  The 
  cement 
  

  

  