﻿12 
  Mr. 
  E. 
  I. 
  Pocock 
  on 
  the 
  

  

  Body 
  compressed, 
  narrowed 
  considerably 
  behind, 
  less 
  so 
  in 
  

   front, 
  widest 
  across 
  the 
  anterior 
  abdominal 
  somite. 
  

  

  Carapace 
  in 
  the 
  smallest 
  specimens 
  entirely 
  smooth, 
  naked 
  

   or 
  clothed 
  more 
  or 
  less 
  thickly 
  at 
  the 
  sides 
  with 
  short 
  close- 
  

   set 
  hairs, 
  which 
  are 
  very 
  easily 
  removed 
  by 
  rubbing- 
  ; 
  in 
  

   half-sized 
  specimens 
  showing 
  faint 
  shallow 
  punctures 
  at 
  the 
  

   sides, 
  deeper 
  punctures 
  above 
  ; 
  as 
  the 
  specimens 
  increase 
  in 
  

   size 
  so 
  do 
  the 
  punctures 
  increase 
  in 
  clearness, 
  until 
  in 
  some 
  

   of 
  the 
  largest 
  the 
  sides 
  of 
  the 
  carapace 
  are 
  adorned 
  with 
  a 
  

   reticulated 
  pattern 
  of 
  smooth 
  ridges, 
  and 
  its 
  dorsal 
  surface, 
  

   where 
  the 
  confluence 
  of 
  the 
  punctures 
  is 
  carried 
  to 
  an 
  extreme, 
  

   with 
  isolated 
  simple 
  or 
  branched 
  ridges. 
  In 
  these 
  specimens 
  

   and 
  some 
  others 
  where 
  the 
  pattern 
  is 
  of 
  less 
  complexity 
  

   various 
  smooth, 
  symmetrically 
  arranged 
  tracts 
  may 
  be 
  noticed 
  

   on 
  the 
  dorsal 
  surface. 
  When 
  clearly 
  expressed 
  these 
  tracts 
  

   present 
  on 
  each 
  side 
  the 
  following 
  arrangement 
  : 
  — 
  one 
  above, 
  

   almost 
  continuous 
  in 
  front 
  with 
  the 
  lateral 
  rostral 
  groove, 
  runs 
  

   directly 
  backwards 
  and 
  terminates 
  in 
  front 
  of 
  the 
  middle 
  of 
  

   the 
  carapace 
  in 
  a 
  more 
  conspicuous, 
  circular, 
  smooth 
  area 
  ; 
  

   behind 
  and 
  a 
  little 
  above 
  this, 
  sometimes 
  confluent 
  with 
  it, 
  

   sometimes 
  separated 
  from 
  it 
  by 
  the 
  interposition 
  of 
  one 
  or 
  

   more 
  than 
  one 
  smooth 
  ridge, 
  there 
  is 
  a 
  similar 
  but 
  less 
  con- 
  

   spicuous 
  area 
  ; 
  beneath 
  this 
  superior, 
  longitudinal, 
  smooth 
  

   tract, 
  but 
  separated 
  from 
  it 
  by 
  a 
  row 
  of 
  ridges, 
  is 
  a 
  second 
  

   similar 
  tract, 
  which 
  at 
  about 
  the 
  middle 
  of 
  the 
  carapace 
  

   gradually 
  breaks 
  up 
  into 
  the 
  interstices 
  which 
  separate 
  the 
  

   ridges; 
  below 
  this 
  again, 
  but 
  taking 
  its 
  rise 
  behind 
  the 
  ante- 
  

   rior 
  third 
  of 
  the 
  carapace 
  in 
  a 
  more 
  conspicuous, 
  vertically 
  

   elongated, 
  smooth 
  area, 
  there 
  is 
  a 
  third 
  tract, 
  which 
  runs 
  

   backwards, 
  at 
  first 
  upwards, 
  then 
  downwards, 
  ultimately 
  to 
  

   disappear, 
  in 
  the 
  same 
  manner 
  as 
  the 
  tract 
  next 
  above 
  it, 
  near 
  

   the 
  hind 
  margin 
  of 
  the 
  lateral 
  portion 
  of 
  the 
  carapace 
  ; 
  this 
  

   tract 
  is 
  separated 
  below 
  by 
  a 
  conspicuous 
  arched 
  ridge 
  from 
  

   the 
  more 
  thickly 
  punctate 
  or 
  reticulated 
  inferior 
  lateral 
  surface 
  

   of 
  the 
  carapace. 
  Laterally 
  the 
  carapace 
  is 
  smooth, 
  where 
  it 
  

   is 
  overlapped 
  by 
  the 
  first 
  abdominal 
  somite 
  ; 
  inferior 
  edge 
  of 
  

   the 
  carapace 
  raised 
  ; 
  anterior 
  edge 
  produced 
  on 
  each 
  side 
  into 
  

   two 
  sharp 
  angular 
  processes 
  — 
  one 
  shorter 
  immediately 
  beneath 
  

   the 
  eye, 
  the 
  other, 
  beneath 
  the 
  antennal 
  peduncle, 
  stretches 
  

   as 
  far 
  or 
  almost 
  as 
  far 
  forwards 
  as 
  the 
  apex 
  of 
  the 
  rostrum. 
  

  

  Rostrum 
  projecting 
  slightly 
  downwards 
  beyond 
  or 
  not 
  so 
  

   far 
  as 
  the 
  anterior 
  margin 
  of 
  the 
  proximal 
  segment 
  of 
  the 
  

   peduncle 
  of 
  the 
  antennula, 
  medianly 
  keeled 
  above 
  and 
  below 
  ; 
  

   the 
  superior 
  keel 
  separated 
  by 
  a 
  depression 
  from 
  the 
  supra- 
  

   orbital 
  portion, 
  beyond 
  which 
  the 
  rostrum 
  is 
  more 
  or 
  less 
  

   sharply 
  constricted 
  and 
  narrows 
  rapidly 
  to 
  the 
  apex 
  ; 
  inferior 
  

   keel 
  usually 
  feebly 
  bidenticulate 
  in 
  front. 
  

  

  