﻿Mm. 
  

  

  Proboscis 
  3. 
  5 
  

  

  Trunk 
  6.0 
  

  

  Second 
  lateral 
  process, 
  width 
  4. 
  6 
  

  

  Scape 
  .5 
  

  

  286 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  particular 
  species, 
  however, 
  as 
  there 
  are 
  no 
  salient 
  characters 
  by 
  which 
  

   it 
  can 
  be 
  identified. 
  It 
  is 
  a 
  large 
  form, 
  as 
  can 
  be 
  seen 
  by 
  the 
  specimen 
  

   from 
  station 
  5075. 
  

   Measurements. 
  — 
  Ks 
  follows 
  (specimen 
  from 
  station 
  5075) 
  : 
  

  

  Third 
  leg: 
  Mm. 
  

  

  First 
  coxa 
  ca. 
  1. 
  

  

  Second 
  coxa 
  2. 
  

  

  Third 
  coxa 
  .8 
  

  

  Femur 
  14. 
  5 
  

  

  First 
  tibia 
  12. 
  5 
  

  

  Second 
  tibia 
  17. 
  5 
  

  

  Tarsus 
  

  

  Propodus 
  

  

  Both 
  localities 
  from 
  which 
  this 
  form 
  was 
  taken 
  are 
  south 
  of 
  Honshu. 
  

  

  Family 
  AMMOTHEIDAE 
  Dohrn, 
  1881 
  

  

  Inasmuch 
  as 
  Nymphonella 
  tapetis^ 
  for 
  which 
  Ohshima 
  (1938) 
  

   erected 
  a 
  new 
  family, 
  is 
  actually 
  an 
  aberrant 
  Ascorhynchvs, 
  I 
  believe 
  

   it 
  should 
  be 
  retained 
  in 
  the 
  Ammotheidae. 
  It 
  evidently 
  owes 
  its 
  

   structural 
  differences 
  (which 
  are 
  confined 
  to 
  the 
  anterior 
  end, 
  specifi- 
  

   cally 
  the 
  first 
  pair 
  of 
  legs 
  and 
  the 
  palpus) 
  , 
  to 
  its 
  parasitic 
  habit. 
  If 
  

   any 
  specimens 
  of 
  this 
  peculiar 
  pycnogonid 
  were 
  collected 
  by 
  the 
  

   Albatross, 
  they 
  must 
  still 
  be 
  inside 
  clam 
  shells, 
  for 
  clams 
  seem 
  to 
  be 
  its 
  

   preferred 
  host. 
  The 
  adults, 
  however, 
  have 
  been 
  found 
  free-living 
  in 
  

   sand. 
  For 
  further 
  information 
  on 
  the 
  history 
  of 
  this 
  species, 
  see 
  

   Ohshima's 
  various 
  papers 
  and 
  Arita 
  (1937). 
  

  

  Although 
  this 
  parasitic 
  species 
  is 
  so 
  far 
  known 
  only 
  from 
  Japan, 
  it 
  is 
  

   possible 
  that 
  it 
  may 
  be 
  of 
  wider 
  occurrence 
  and 
  will 
  be 
  discovered 
  

   elsewhere. 
  It 
  would 
  seem 
  logical 
  to 
  expect 
  it 
  on 
  the 
  California 
  coast. 
  

  

  The 
  taxonomic 
  relationship 
  of 
  Nymphonella 
  to 
  Ascorhynchus 
  would 
  

   seem 
  to 
  be 
  confirmed 
  by 
  the 
  occurrence 
  of 
  six 
  species 
  of 
  Ascorhynchus 
  

   in 
  or 
  near 
  Japan, 
  most 
  of 
  them 
  in 
  or 
  near 
  Sagami 
  Bay. 
  This 
  is 
  more 
  

   than 
  have 
  been 
  found 
  anywhere 
  else 
  in 
  as 
  restricted 
  a 
  locality. 
  

  

  Genus 
  ACHELIA 
  Hodge, 
  1864 
  

  

  ACHELIA 
  BOREALIS 
  (Schimkewitsch) 
  

  

  FiGtJKE 
  41, 
  ft-m 
  

  

  Ammothea 
  borealis 
  Schimkewitsch, 
  1895, 
  pp. 
  36-40, 
  pi. 
  2, 
  figs, 
  a-b 
  ; 
  1907, 
  pp. 
  5-9, 
  

  

  pi. 
  1 
  ; 
  1930, 
  pp. 
  139-144, 
  figs. 
  34-37. 
  

   Ammothea 
  borealis 
  var. 
  japonica 
  Losina-Losinsky, 
  1933, 
  pp. 
  57-59, 
  fig. 
  9. 
  

   Achelia 
  borealis 
  Hedgpeth, 
  1947, 
  pp. 
  24, 
  27, 
  fig. 
  13b. 
  

  

  Collecting 
  record.— 
  Albatross 
  station 
  5037, 
  latitude 
  42°02'40" 
  N., 
  

   longitude 
  142°33'20" 
  E., 
  175-349 
  fathoms, 
  October 
  1, 
  1906, 
  37.9° 
  F., 
  

   1 
  ovigerous 
  male. 
  

  

  