﻿PYCNOGONIDA 
  FROM 
  JAPANESE 
  WATERS 
  — 
  HEDGPETH 
  

  

  269 
  

  

  Palpus 
  rather 
  short 
  and 
  thick, 
  the 
  fourth 
  joint 
  about 
  half 
  as 
  long 
  

   as 
  the 
  fifth. 
  

  

  Oviger 
  : 
  Fourth 
  joint 
  conspicuously 
  shorter 
  than 
  fifth, 
  arcuate 
  but 
  

   not 
  strongly 
  curved, 
  fifth 
  joint 
  straight, 
  club-shaped 
  in 
  both 
  sexes, 
  but 
  

   somewhat 
  more 
  angular 
  in 
  the 
  male 
  and 
  with 
  several 
  reversed 
  spines 
  

   toward 
  the 
  distal 
  end. 
  The 
  compound 
  spines 
  of 
  the 
  oviger 
  are 
  large 
  

   and 
  coarse, 
  with 
  two 
  or 
  three 
  pairs 
  of 
  large 
  denticulations. 
  Terminal 
  

   claw 
  somewhat 
  longer 
  than 
  terminal 
  joint, 
  with 
  about 
  a 
  dozen 
  well- 
  

   separated 
  spinules. 
  Formula 
  of 
  spines 
  on 
  terminal 
  joints 
  usually 
  

   11:6:6:5:: 
  12. 
  

  

  Third 
  leg 
  fairly 
  robust, 
  with 
  fine 
  setae 
  on 
  femoral 
  and 
  tibial 
  joints. 
  

   First 
  and 
  third 
  coxae 
  subequal, 
  second 
  coxae 
  about 
  as 
  long 
  as 
  first 
  and 
  

   third 
  together. 
  Femur 
  straight, 
  shorter 
  than 
  first 
  tibia. 
  Second 
  tibia 
  

   longer 
  than 
  first. 
  Propodus 
  slightly 
  more 
  than 
  half 
  as 
  long 
  as 
  tarsus, 
  

   both 
  joints 
  with 
  a 
  row 
  of 
  close-set 
  small 
  spines 
  along 
  ventral 
  surface. 
  

   Terminal 
  claw 
  moderately 
  heavy, 
  fairly 
  straight, 
  about 
  a 
  third 
  as 
  long 
  

   as 
  the 
  propodus. 
  No 
  auxiliary 
  claws. 
  

  

  Measurements. 
  — 
  As 
  follows 
  : 
  

  

  Mm. 
  

  

  Proboscis 
  2. 
  5 
  

  

  Trunk 
  5.1 
  

  

  Second 
  lateral 
  process, 
  width 
  — 
  3. 
  25 
  

  

  Abdomen 
  

  

  Scape 
  2 
  

  

  Chela 
  2 
  

  

  Palpus 
  2 
  

  

  8 
  

   5 
  

   3 
  

  

  75 
  

  

  Third 
  leg: 
  Mm. 
  

  

  First 
  coxa 
  0. 
  6 
  

  

  Second 
  coxa 
  2. 
  

  

  Third 
  coxa 
  . 
  7 
  

  

  Femur 
  4.0 
  

  

  First 
  tibia 
  5.0 
  

  

  Second 
  tibia 
  7. 
  75 
  

  

  Tarsus 
  1. 
  1 
  

  

  Propodus 
  2. 
  1 
  

  

  Terminal 
  claw 
  . 
  8 
  

  

  Rem<irks. 
  — 
  This 
  species 
  is 
  separable 
  from 
  the 
  other 
  uniunguiculate 
  

   species 
  from 
  Japanese 
  waters 
  on 
  the 
  basis 
  of 
  the 
  short 
  propodus, 
  the 
  

   small 
  palpus, 
  and 
  smaller 
  chela 
  with 
  its 
  large, 
  well-separated 
  spinules. 
  

   The 
  conspicuously 
  straight 
  fifth 
  joint 
  of 
  the 
  oviger 
  also 
  appears 
  to 
  be 
  

   characteristic. 
  All 
  the 
  material 
  was 
  collected 
  in 
  moderately 
  deep 
  

   water 
  off 
  the 
  southern 
  coast 
  of 
  Honshu. 
  

  

  NOTES 
  ON 
  HILTON'S 
  SPECIES 
  OF 
  NYMPHON 
  

  

  Before 
  it 
  was 
  possible 
  to 
  make 
  final 
  determinations 
  of 
  the 
  material 
  

   from 
  Japanese 
  waters 
  in 
  this 
  genus, 
  it 
  was 
  necessary 
  to 
  examine 
  the 
  

   types 
  of 
  the 
  several 
  new 
  species 
  of 
  Nymphon 
  from 
  the 
  North 
  Pacific 
  

   proposed 
  by 
  Hilton 
  (1942a), 
  inasmuch 
  as 
  only 
  brief 
  diagn,oses 
  were 
  

   given. 
  Several 
  of 
  these 
  have 
  already 
  been 
  cited 
  in 
  the 
  foregoing 
  

   taxonomic 
  discussion, 
  but 
  in 
  order 
  to 
  clarify 
  the 
  status 
  of 
  all 
  of 
  them, 
  

   brief 
  comments 
  and 
  drawings 
  of 
  diagnostic 
  characters 
  are 
  presented 
  

   below. 
  Only 
  the 
  material 
  personally 
  examined 
  is 
  cited. 
  

  

  