﻿84 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  PERIPHYLLA 
  HYACINTHINA 
  Steenstrup. 
  

   Periphylla 
  hyacinthina 
  Steenstrup, 
  1837. 
  

  

  (For 
  full 
  synonymy, 
  see 
  Bigelow, 
  1909a, 
  p. 
  26, 
  and 
  Mayer, 
  1910, 
  p. 
  544.) 
  

  

  Station 
  4758, 
  300-0 
  fathoms, 
  south 
  of 
  Alaska 
  Peninsula; 
  2 
  speci- 
  

   mens. 
  

  

  Station 
  4759, 
  300-0 
  fathoms, 
  south 
  of 
  Alaska 
  Peninsula; 
  3 
  speci- 
  

   mens. 
  

  

  Station 
  4760, 
  300-0 
  fathoms, 
  south 
  of 
  Alaska 
  Peninsula; 
  2 
  speci- 
  

   mens. 
  

  

  Station 
  4761, 
  1973-0 
  fathoms, 
  south 
  of 
  Alaska 
  Peninsula; 
  1 
  speci- 
  

   men. 
  

  

  Station 
  4765, 
  1217-0 
  fathoms; 
  1 
  specimen. 
  

  

  Station 
  4766, 
  300-0 
  fathoms, 
  Bering 
  Sea; 
  4 
  specimens. 
  

  

  Station 
  4767, 
  300-0 
  fathoms, 
  Bering 
  Sea; 
  4 
  specimens. 
  

  

  Station 
  4773, 
  334-0 
  fathoms, 
  Bering 
  Sea; 
  3 
  specimens. 
  

  

  Station 
  4774, 
  557-0 
  fathoms, 
  Bering 
  Sea; 
  2 
  specimens. 
  

  

  Station 
  4775, 
  585-0 
  fathoms, 
  Bering 
  Sea; 
  3 
  specimens. 
  

  

  Station 
  4781, 
  482-0 
  fathoms, 
  Bering 
  Sea; 
  1 
  specimen. 
  

  

  Station 
  4785, 
  300-0 
  fathoms, 
  Bering 
  Sea; 
  7 
  specimens. 
  

  

  Station 
  4793, 
  300-0 
  fathoms, 
  off 
  Kamchatka; 
  2 
  specimens. 
  

  

  Station 
  4797, 
  300-0 
  fathoms. 
  Sea 
  of 
  Okhotsk; 
  2 
  specimens. 
  

  

  Station 
  4928, 
  1008-0 
  fathoms, 
  Japanese 
  waters; 
  1 
  specimen. 
  

  

  Station 
  4951, 
  703-0 
  fathoms, 
  Japanese 
  waters; 
  1 
  specimen. 
  

  

  Station 
  4956, 
  720-0 
  fathoms, 
  Japanese 
  waters; 
  1 
  specimen. 
  

  

  Station 
  4958, 
  405-0 
  fathoms, 
  Japanese 
  waters; 
  1 
  specimen. 
  

  

  Station 
  5063, 
  300-0 
  fathoms, 
  Japanese 
  waters; 
  1 
  specimen. 
  

  

  Also 
  — 
  

  

  Station 
  3070, 
  685-0 
  fathoms, 
  off 
  the 
  coast 
  of 
  Oregon 
  ; 
  3 
  specimens. 
  

  

  Station 
  3222, 
  50-0 
  fathoms, 
  Bering 
  Sea; 
  1 
  specimen. 
  

  

  Out 
  of 
  the 
  total 
  of 
  46 
  specimens, 
  29, 
  illustrating 
  the 
  whole 
  range 
  

   of 
  development 
  from 
  10 
  to 
  70 
  mm. 
  in 
  diameter, 
  are 
  in 
  beautiful 
  con- 
  

   dition; 
  the 
  remainder 
  may 
  be 
  described 
  as 
  fair. 
  

  

  From 
  the 
  systematic 
  standpoint 
  the 
  most 
  important 
  thing 
  illus- 
  

   trated 
  by 
  this 
  series 
  is 
  the 
  extension 
  of 
  the 
  entodermal 
  pigmentation 
  

   with 
  growth. 
  In 
  the 
  specimens 
  up 
  to 
  about 
  15 
  mm. 
  in 
  diameter 
  the 
  

   pigment 
  is 
  entirely 
  restricted 
  to 
  the 
  stomach, 
  as 
  in 
  the 
  young 
  speci- 
  

   mens 
  from 
  the 
  eastern 
  Pacific. 
  The 
  gonads 
  are 
  first 
  visible 
  in 
  a 
  

   specimen 
  of 
  about 
  10 
  mm; 
  and 
  in 
  the 
  examples 
  of 
  12-15 
  mm., 
  the}^ 
  

   are 
  of 
  considerable 
  size; 
  so 
  these 
  specimens, 
  if 
  captured 
  alone, 
  would 
  

   probably 
  liave 
  been 
  recorded 
  as 
  dodecahostrycha. 
  As 
  growth 
  pro- 
  

   ceeds, 
  the 
  pigmentation 
  extends 
  from 
  the 
  stomach 
  out 
  over 
  the 
  sub- 
  

   umbrella. 
  The 
  beginning 
  of 
  the 
  process 
  is 
  to 
  be 
  seen 
  in 
  a 
  speci- 
  

   men 
  of 
  16 
  mm., 
  and 
  in 
  those 
  of 
  20 
  mm. 
  the 
  pigment 
  is 
  fairly 
  dense 
  as 
  

   far 
  as 
  the 
  proximal 
  ends 
  of 
  the 
  gonads 
  in 
  the 
  radii 
  of 
  these 
  organs, 
  

   while 
  between 
  them 
  it 
  reaches 
  to 
  about 
  the 
  middle 
  of 
  their 
  length, 
  

   corresponding 
  to 
  the 
  comer 
  of 
  the 
  stomach. 
  

  

  