﻿TWO 
  NEW 
  FORMS 
  OP 
  CHONIOSTOMATIDJ;. 
  355 
  

  

  and 
  '4 
  mm. 
  in 
  breadth, 
  but 
  in 
  tliis 
  specimen 
  the 
  mouth 
  turns 
  

   essentially 
  downwards. 
  The 
  head 
  is 
  sharply 
  defined 
  from 
  

   the 
  thorax, 
  broader 
  than 
  long, 
  without 
  lateral 
  borders. 
  The 
  

   antennulse 
  (fig. 
  2 
  e) 
  are 
  small, 
  two-jointed, 
  the 
  second 
  joint 
  

   not 
  well 
  defined, 
  as 
  long 
  as 
  or 
  shorter 
  than 
  the 
  first, 
  with 
  an 
  

   olfactory 
  seta 
  {s) 
  nearly 
  longer 
  than 
  the 
  whole 
  antennula, 
  

   and 
  besides 
  with 
  two, 
  three, 
  or 
  four 
  acute, 
  somewhat 
  shorter 
  

   setae. 
  The 
  maxillge 
  (e) 
  have 
  no 
  protuberance 
  or 
  hairs 
  on 
  the 
  

   rather 
  slender 
  basal 
  joint; 
  the 
  second 
  joint 
  is 
  thick 
  at 
  the 
  

   base. 
  The 
  maxillipeds 
  (/) 
  are 
  rather 
  anomalous 
  ; 
  the 
  basal 
  

   joint 
  is 
  short, 
  but 
  exceedingly 
  thick, 
  only 
  very 
  little 
  longer 
  

   than 
  thick, 
  with 
  the 
  admedian 
  margin 
  concave 
  and 
  the 
  outer 
  

   side 
  strongly 
  vaulted; 
  a 
  transverse 
  row 
  of 
  short 
  hairs 
  is 
  seen 
  

   on 
  the 
  inner 
  part 
  of 
  the 
  lower 
  side 
  on 
  its 
  proximal 
  half, 
  and 
  

   a 
  similar 
  and 
  little 
  longer 
  row 
  at 
  the 
  distal 
  margin 
  near 
  the 
  

   articulating 
  membrane. 
  The 
  second 
  joint 
  is 
  rather 
  short, 
  

   and 
  not 
  completely 
  regularly 
  shaped; 
  the 
  third 
  joint 
  is 
  

   shaped 
  nearly 
  as 
  a 
  short 
  thick 
  claw 
  inserted 
  on 
  the 
  anterior 
  

   surface 
  of 
  the 
  second 
  joint 
  near 
  its 
  end. 
  The 
  submedian 
  

   skeleton 
  is 
  not 
  very 
  strongly 
  developed, 
  without 
  processes. 
  

   Head 
  and 
  thorax 
  without 
  hairs. 
  The 
  genital 
  area 
  (fig. 
  2 
  g) 
  

   is 
  about 
  half 
  as 
  broad 
  as 
  the 
  base 
  of 
  the 
  head, 
  nearly 
  as 
  long 
  

   as 
  broad, 
  with 
  the 
  outline 
  almost 
  circular, 
  but 
  somewhat 
  

   emarginate 
  behind; 
  the 
  protuberance 
  (p) 
  mentioned 
  in 
  the 
  

   diagnosis 
  of 
  the 
  genus 
  is 
  well 
  chitinised, 
  especially 
  the 
  lateral 
  

   parts 
  of 
  its 
  proximal 
  half, 
  but 
  the 
  lateral 
  part 
  of 
  the 
  area 
  

   itself 
  is 
  less 
  chitinised, 
  and 
  the 
  portion 
  in 
  the 
  main 
  covering 
  

   the 
  muscle 
  of 
  each 
  half, 
  is 
  rather 
  thin-skinned. 
  The 
  pro- 
  

   tuberance 
  is 
  distally 
  either 
  I'ounded 
  or 
  truncate, 
  with 
  the 
  

   angles 
  rounded. 
  The 
  genital 
  apertures 
  (g) 
  are 
  long, 
  strongly 
  

   curved, 
  their 
  most 
  anterior 
  (lower) 
  portion 
  is 
  nearly 
  parallel, 
  

   and 
  the 
  distance 
  between 
  them 
  is 
  here 
  slightly 
  more 
  than 
  

   one 
  half 
  of 
  their 
  length, 
  while 
  the 
  distance 
  between 
  their 
  

   opposite 
  ends 
  is 
  about 
  two 
  and 
  a 
  half 
  times 
  longer 
  than 
  one 
  

   of 
  them. 
  The 
  whole 
  area 
  is 
  naked. 
  The 
  muscles 
  (m) 
  to 
  the 
  

   antero-lateral 
  half 
  of 
  the 
  frame 
  of 
  each 
  aperture 
  are 
  directed 
  

   somewhat 
  outwards 
  and 
  essentially 
  forwards. 
  The 
  sausage- 
  

  

  