﻿PYCNOGONIDA 
  FROM 
  JAPANESE 
  WATERS 
  — 
  HEDGPETH 
  253 
  

  

  Other 
  collecting 
  records. 
  — 
  AZJa^^wss 
  stations 
  3697 
  (10+ 
  specimens) 
  ; 
  

   3698 
  (6 
  specimens) 
  ; 
  4965 
  (1 
  female). 
  

  

  Descnption. 
  — 
  Trunk 
  moderately 
  elongate, 
  lateral 
  processes 
  sepa- 
  

   rated 
  by 
  slightly 
  more 
  than 
  their 
  width, 
  body 
  without 
  processes, 
  

   tubercles, 
  or 
  conspicuous 
  setae. 
  In 
  some 
  specimens 
  the 
  trunk 
  is 
  more 
  

   closely 
  set. 
  Eye 
  tubercle 
  slightly 
  higher 
  than 
  width 
  at 
  base, 
  bluntly 
  

   rounded 
  at 
  top, 
  with 
  large 
  well-developed 
  (heavily 
  pigmented) 
  eyes 
  

   near 
  the 
  apex. 
  Neck 
  about 
  three 
  times 
  as 
  long 
  as 
  wide. 
  

  

  Proboscis 
  as 
  long 
  as 
  neck, 
  cylindrical, 
  and 
  bluntly 
  rounded 
  at 
  tip. 
  

  

  Abdomen 
  papilliform, 
  about 
  as 
  long 
  as 
  last 
  lateral 
  process, 
  directed 
  

   at 
  an 
  angle 
  of 
  about 
  50°. 
  

  

  Chelifore 
  about 
  two-thirds 
  the 
  diameter 
  of 
  the 
  neck, 
  as 
  long 
  as 
  

   proboscis. 
  Chelae 
  fairly 
  heavy, 
  the 
  palm 
  and 
  fingers 
  almost 
  equal 
  

   in 
  length, 
  fingers 
  slender, 
  curved, 
  crossing 
  at 
  tips 
  and 
  armed 
  with 
  

   about 
  17 
  to 
  20 
  to 
  25 
  spines 
  on 
  the 
  immovable 
  finger 
  and 
  20 
  to 
  30 
  

   on 
  the 
  dactylus. 
  Palm 
  well 
  covered 
  with 
  large 
  setae 
  in 
  some 
  speci- 
  

   mens, 
  almost 
  glabrous 
  in 
  others. 
  

  

  Palpus 
  somewhat 
  longer 
  than 
  proboscis, 
  slender, 
  hairy. 
  Fourth 
  

   joint 
  conspicuously 
  shorter 
  than 
  fifth, 
  the 
  two 
  together 
  slightly 
  

   longer 
  than 
  the 
  third. 
  

  

  Oviger 
  : 
  Fourth 
  joint 
  not 
  strongly 
  curved, 
  about 
  as 
  long 
  as 
  the 
  fifth, 
  

   which 
  is 
  straight 
  and 
  weakly 
  clavate. 
  There 
  are 
  a 
  few 
  stiff 
  spines 
  

   near 
  the 
  base 
  of 
  the 
  fifth 
  joint 
  on 
  the 
  outer 
  side. 
  Compound 
  spines 
  

   large, 
  coarse, 
  with 
  two 
  pairs 
  of 
  large 
  denticulations. 
  Terminal 
  claw 
  

   as 
  long 
  as 
  segment, 
  with 
  8 
  to 
  9 
  well-spaced 
  spines. 
  Formulae 
  of 
  

   spines: 
  11: 
  7: 
  7: 
  6:: 
  8-9. 
  

  

  Leg 
  : 
  First 
  and 
  third 
  coxae 
  subequal, 
  as 
  long 
  as 
  broad 
  ; 
  second 
  coxa 
  

   somewhat 
  longer 
  than 
  first 
  and 
  third 
  together. 
  Femur 
  straight, 
  

   about 
  one 
  and 
  a 
  half 
  times 
  as 
  long 
  as 
  the 
  coxae. 
  First 
  tibia 
  not 
  con- 
  

   spicuously 
  longer 
  than 
  femur, 
  second 
  tibia 
  longer 
  than 
  first. 
  The 
  

   tibiae 
  are 
  slender 
  and 
  sticklike 
  and 
  moderately 
  setose. 
  Tarsus 
  and 
  

   propodus 
  subequal, 
  with 
  a 
  row 
  of 
  small 
  well-separated 
  spines 
  on 
  

   ventral 
  surface. 
  Terminal 
  claw 
  large, 
  slender, 
  and 
  well 
  curved, 
  about 
  

   two-thirds 
  as 
  long 
  as 
  propodus. 
  Auxiliary 
  claws 
  slender, 
  about 
  half 
  

   as 
  long 
  as 
  terminal 
  claw. 
  

  

  Measurements 
  (paratype, 
  male) 
  as 
  follows: 
  

  

  Third 
  leg: 
  Mm. 
  

  

  First 
  coxa 
  0. 
  75 
  

  

  Second 
  coxa 
  2. 
  5 
  

  

  Mm. 
  

  

  Proboscis 
  1. 
  5 
  

  

  Trunk 
  5. 
  5 
  

  

  Second 
  lateral 
  process, 
  width— 
  3. 
  

  

  Abdomen 
  1. 
  

  

  Scape 
  2. 
  

  

  Chela 
  3. 
  25 
  

  

  Palpus 
  4. 
  

  

  Third 
  coxa 
  1. 
  

  

  Femur 
  5.75 
  

  

  First 
  tibia 
  7. 
  5 
  

  

  Second 
  tibia 
  10.8 
  

  

  Tarsus 
  1. 
  1 
  

  

  Propodus 
  2. 
  

  

  Terminal 
  claw 
  0. 
  75 
  

  

  Auxiliary 
  claw 
  0.25 
  

  

  