﻿PYCNOGONIDA 
  FROM 
  JAPANESE 
  WATERS 
  — 
  HEDGPETH 
  

  

  257 
  

  

  Oviger 
  moderately 
  long, 
  the 
  fourth 
  segment 
  shorter 
  than 
  the 
  fifth, 
  

   both 
  segments 
  relatively 
  straight. 
  Compound 
  spines 
  of 
  terminal 
  

   joints 
  relatively 
  large, 
  with 
  three 
  or 
  four 
  pairs 
  of 
  coarse 
  denticulations. 
  

   Formula 
  : 
  9:6:6:6:: 
  9-10. 
  

  

  Leg 
  moderately 
  long, 
  femur 
  and 
  tibial 
  joints 
  armed 
  with 
  short 
  

   stiff 
  setae. 
  First 
  and 
  third 
  coxae 
  subequal, 
  second 
  coxae 
  about 
  as 
  long 
  

   as 
  first 
  and 
  third 
  together. 
  Femur 
  about 
  one-and-a-half 
  times 
  as 
  long 
  

   as 
  coxae, 
  slightly 
  arched. 
  First 
  tibia 
  slightly 
  longer 
  than 
  femur, 
  sec- 
  

   ond 
  tibia 
  half 
  again 
  as 
  long 
  as 
  first. 
  Tarsal 
  joints 
  small, 
  tarsus 
  not 
  

   quite 
  so 
  long 
  as 
  propodus, 
  ventral 
  surfaces 
  of 
  both 
  joints 
  with 
  a 
  row 
  

   of 
  well-separated 
  short 
  spines. 
  Terminal 
  claw 
  heavy, 
  less 
  than 
  half 
  

   as 
  long 
  as 
  propodus. 
  Auxiliary 
  claws 
  very 
  small, 
  less 
  than 
  one-fifth 
  

   as 
  long 
  as 
  terminal 
  claw. 
  

  

  M 
  easurements. 
  — 
  As 
  follows 
  : 
  

  

  Mm. 
  

  

  Proboscis 
  1. 
  8 
  

  

  Trunk 
  .5. 
  

  

  Second 
  lateral 
  process, 
  width 
  2. 
  7.5 
  

  

  Abdomen 
  . 
  8 
  

  

  Scape 
  2. 
  

  

  Chela 
  1. 
  7 
  

  

  Palpus 
  3. 
  6 
  

  

  Third 
  leg: 
  Mm. 
  

  

  First 
  coxa 
  0. 
  8 
  

  

  Second 
  coxa 
  2. 
  

  

  Third 
  cova 
  1. 
  

  

  Femur 
  6.0 
  

  

  First 
  tibia 
  6.5 
  

  

  Second 
  tibia 
  10.0 
  

  

  Tarsus 
  1. 
  25 
  

  

  Propodus 
  1. 
  9 
  

  

  Terminal 
  claw 
  . 
  75 
  

  

  Auxiliary 
  claw 
  . 
  2 
  

  

  ReniarJcs. 
  — 
  This 
  species 
  most 
  nearly 
  resembles 
  N. 
  micronyx 
  Sars 
  

   which 
  Schimkewitsch 
  (1930, 
  pp. 
  476-478) 
  identified 
  from 
  Kamchatka, 
  

   but 
  I 
  cannot 
  identify 
  this 
  specimen 
  with 
  that 
  species 
  because 
  of 
  the 
  

   coarse 
  toothed 
  spines 
  of 
  the 
  oviger 
  and 
  the 
  very 
  short 
  auxiliary 
  claws, 
  

   as 
  well 
  as 
  the 
  considerably 
  greater 
  depth 
  from 
  which 
  it 
  was 
  collected, 
  

   inasmuch 
  as 
  N. 
  micronyx 
  is 
  recorded 
  in 
  depths 
  from 
  4 
  to 
  38 
  meters. 
  It 
  

   may 
  be 
  considered 
  a 
  Pacific 
  Ocean 
  form 
  or 
  variety 
  of 
  Nymphon 
  mi- 
  

   cronyx 
  unless 
  Schimkewitsch 
  's 
  specimen 
  is 
  a 
  good 
  micronyx; 
  in 
  which 
  

   case 
  it 
  should 
  be 
  considered 
  a 
  separate 
  species 
  and 
  the 
  circumpolar 
  dis- 
  

   tribution 
  of 
  N. 
  micronyx 
  established 
  on 
  the 
  basis 
  of 
  Schimkewitsch's 
  

   determination. 
  Derjugin 
  et 
  al. 
  (1935, 
  p. 
  30) 
  suggest 
  that 
  the 
  Kam- 
  

   chatka 
  specimen 
  is 
  actually 
  N. 
  hrevirostre 
  auct. 
  

  

  NYMPHON 
  GUNTERI, 
  new 
  species 
  

  

  FiGXJRE 
  26 
  

  

  Eolotype 
  (/ema7e).— 
  U.S.N.M. 
  No. 
  80588, 
  Alhatross 
  station 
  5050, 
  

   latitude 
  38°11'30" 
  N., 
  longitude 
  142°08' 
  E., 
  266 
  fathoms, 
  37.9° 
  F., 
  

   October 
  10, 
  1906. 
  

  

  Description. 
  — 
  Trunk 
  moderately 
  elongate, 
  lateral 
  processes 
  sepa- 
  

  

  