﻿PYCNOGONIDA 
  FROM 
  JAPANESE 
  WATERS 
  — 
  HEDGPETH 
  301 
  

  

  COLOSSENDEIS 
  CHITINOSA 
  Hilton 
  

  

  Figure 
  47, 
  e-h 
  

   Colossendeis 
  chitinosa 
  Hilton, 
  1943b, 
  p. 
  4. 
  

  

  Collecting 
  records. 
  — 
  Albatross 
  stations 
  3703 
  (1 
  specimen) 
  ; 
  4982 
  

   (6 
  specimens), 
  

  

  Sagami 
  Bay, 
  1 
  specimen. 
  

  

  Identification 
  of 
  this 
  species 
  has 
  been 
  confirmed 
  by 
  examination 
  of 
  

   the 
  type 
  material, 
  from 
  which 
  it 
  differs 
  in 
  the 
  possession 
  of 
  a 
  some- 
  

   what 
  longer 
  terminal 
  claw. 
  As 
  the 
  species 
  has 
  not 
  been 
  described 
  

   or 
  figured, 
  a 
  description, 
  based 
  on 
  the 
  above 
  specimens, 
  follows: 
  

  

  Trunk 
  completely 
  segmented, 
  with 
  ringlike 
  swellings 
  at 
  the 
  distal 
  

   ends 
  of 
  the 
  segments. 
  This 
  ring 
  is 
  projected 
  into 
  a 
  sharply 
  pointed 
  

   tubercle 
  dorsally. 
  The 
  eye 
  tubercle 
  is 
  about 
  twice 
  as 
  tall 
  as 
  the 
  dorsal 
  

   trunk 
  tubercles, 
  sharply 
  pointed 
  with 
  the 
  point 
  projected 
  forward. 
  

   The 
  eyes 
  are 
  heavily 
  pigmented, 
  located 
  in 
  the 
  basal 
  third 
  of 
  the 
  

   tubercle. 
  Although 
  Hilton 
  describes 
  the 
  eyes 
  as 
  "being 
  at 
  different 
  

   levels" 
  they 
  are 
  not 
  conspicuously 
  so; 
  it 
  is 
  the 
  forward 
  slant 
  of 
  the 
  

   eye 
  tubercle 
  which 
  gives 
  this 
  impression. 
  

  

  Abdomen 
  very 
  small, 
  bluntly 
  conical 
  and 
  almost 
  ventral 
  in 
  location. 
  

  

  Proboscis 
  longer 
  than 
  trunk, 
  dilated, 
  curved 
  downward 
  as 
  in 
  C. 
  

   dofleini. 
  

  

  Palpus 
  second 
  joint 
  curved, 
  about 
  one 
  and 
  one-third 
  as 
  long 
  as 
  

   fourth. 
  Joints 
  7 
  to 
  9 
  long, 
  slender, 
  subequal, 
  sixth 
  slightly 
  shorter 
  

   than 
  seventh. 
  

  

  Third 
  leg 
  coxae 
  subequal, 
  about 
  as 
  broad 
  as 
  long. 
  Femur 
  and 
  

   second 
  tibia 
  subequal, 
  first 
  tibia 
  about 
  a 
  third 
  longer 
  than 
  femur. 
  

   Tarsus 
  slightly 
  longer 
  than 
  propodus, 
  terminal 
  claw 
  almost 
  as 
  long 
  

   as 
  propodus. 
  The 
  sole 
  of 
  both 
  tarsal 
  joints 
  bears 
  a 
  closely 
  set 
  row 
  of 
  

   fine, 
  short 
  spines. 
  

  

  Oviger 
  somewhat 
  short 
  for 
  a 
  member 
  of 
  this 
  genus. 
  Second 
  and 
  

   fourth 
  joints 
  subequal. 
  Terminal 
  joints 
  subequal, 
  with 
  several 
  rows 
  

   of 
  spines 
  which 
  do 
  not 
  appear 
  to 
  be 
  denticulated. 
  On 
  the 
  last 
  seg- 
  

   ment 
  there 
  is 
  a 
  large 
  spine 
  opposing 
  the 
  terminal 
  claw, 
  forming 
  a 
  

   subchelate 
  structure. 
  

  

  Measurement's. 
  — 
  Proboscis, 
  6 
  mm. 
  ; 
  trunk 
  3.5 
  mm. 
  ; 
  third 
  leg, 
  ca. 
  25 
  

   mm. 
  

  

  Remarks. 
  — 
  This 
  species 
  is 
  superficially 
  close 
  to 
  C. 
  dofleini., 
  but 
  is 
  

   about 
  two-thirds 
  as 
  large, 
  with 
  much 
  slenderer 
  legs 
  and 
  terminal 
  

   claw. 
  Colossendeis 
  dofleini 
  has 
  no 
  spines 
  on 
  the 
  tarsal 
  joints. 
  In 
  

   the 
  structure 
  of 
  the 
  terminal 
  segment 
  of 
  the 
  oviger 
  it 
  resembles 
  C. 
  

   calif 
  ornica 
  Hedgpeth 
  (1939), 
  but 
  differs 
  from 
  that 
  species 
  in 
  the 
  

   structure 
  of 
  the 
  eye 
  tubercle 
  and 
  shorter 
  terminal 
  claw. 
  

  

  C. 
  chitinosa 
  ranges 
  from 
  Sagami 
  Bay 
  to 
  the 
  Aleutians. 
  

  

  