﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  8IPHONOPHORAE—BIOELOW. 
  81 
  

  

  Each 
  gonodendron 
  bears 
  several 
  long 
  thin-walled 
  palpons 
  in 
  addi- 
  

   tion 
  to 
  the 
  gonophores. 
  

  

  In 
  their 
  present 
  condition 
  all 
  the 
  cormidia 
  have 
  dropped 
  their 
  

   siphons, 
  but 
  the 
  scar 
  left 
  by 
  this 
  mutilation 
  is 
  invariably 
  very 
  notice- 
  

   able 
  just 
  proximal 
  to 
  the 
  point 
  at 
  which 
  the 
  gonodendra 
  branch 
  out. 
  

   The 
  one 
  siphon 
  loose 
  in 
  the 
  bottle 
  is 
  of 
  the 
  usual 
  type, 
  but 
  its 
  ten- 
  

   tacle, 
  as 
  Lens 
  and 
  Van 
  Riemsdijk 
  observed, 
  is 
  unusually 
  stout, 
  and 
  

   it 
  has 
  a 
  well-developed 
  suspensional 
  membrane 
  as 
  in 
  Dromalia. 
  The 
  

   only 
  tentilla 
  intact 
  are 
  so 
  young 
  that 
  they 
  as 
  yet 
  give 
  no 
  indication 
  

   whether 
  an 
  involucre 
  is 
  formed 
  later, 
  or 
  how 
  many 
  terminal 
  filaments 
  

   they 
  are 
  fated 
  to 
  have. 
  

  

  In 
  many 
  cases 
  the 
  gelatinous 
  stalks 
  bear 
  accessory 
  stalks 
  near 
  their 
  

   bases, 
  and 
  these 
  accessory 
  stalks 
  develop 
  gonophores 
  and 
  palpons. 
  

   But 
  I 
  have 
  found 
  none 
  with 
  a 
  siphon, 
  and 
  am 
  in 
  doubt 
  whether 
  any 
  

   of 
  them 
  normally 
  bore 
  such 
  organs. 
  

  

  One 
  of 
  the 
  most 
  interesting 
  features 
  of 
  the 
  specimen 
  remains 
  to 
  be 
  

   mentioned; 
  this 
  is 
  that 
  the 
  stalks 
  of 
  the 
  cormidia 
  near 
  the 
  upper 
  end 
  

   of 
  the 
  bag-like 
  siphosome 
  usually 
  bear 
  from 
  one 
  to 
  three 
  small 
  wing- 
  

   like 
  muscular 
  lamellae 
  on 
  their 
  outer 
  sides, 
  close 
  to 
  the 
  base. 
  At 
  

   present 
  there 
  is 
  nothing 
  attached 
  to 
  any 
  of 
  these 
  lamellae, 
  but 
  they 
  

   are 
  reminiscent, 
  both 
  in 
  structure 
  and 
  in 
  position, 
  of 
  the 
  lamellae 
  to 
  

   which 
  the 
  bracts 
  are 
  attached 
  in 
  various 
  Agalmids, 
  as, 
  for 
  instance, 
  

   StepJianomia 
  hijuga 
  (19116, 
  pi. 
  20, 
  fig. 
  1), 
  and 
  therefore 
  suggest 
  the 
  

   possibility 
  that 
  Archangelopsis 
  may 
  have 
  bracts 
  as 
  well 
  as 
  necto- 
  

   phores. 
  

  

  Suborder 
  CHONDROPHORAE. 
  

  

  Family 
  PORPITIDAE 
  Brandt, 
  1835. 
  

   Genus 
  PORPITA 
  Lamarck, 
  1801. 
  

  

  PORPITA 
  PACIFICA 
  Lesson. 
  

   Porpita 
  pacifica 
  Lesson, 
  1826, 
  pi. 
  7, 
  figs. 
  3, 
  3^. 
  

  

  (For 
  synonymy, 
  see 
  Bigelow, 
  19116, 
  p. 
  333.) 
  

  

  Station 
  4883, 
  surface; 
  7 
  specimens, 
  23 
  to 
  40 
  mm. 
  in 
  diameter. 
  

  

  Station 
  4884, 
  surface; 
  4 
  specimens, 
  30 
  to 
  35 
  mm. 
  in 
  diameter. 
  

  

  Station 
  4909, 
  surface; 
  2 
  specimens, 
  25 
  and 
  30 
  mm. 
  in 
  diameter. 
  

  

  Station 
  4917, 
  surface; 
  1 
  specimen, 
  2 
  mm. 
  in 
  diameter. 
  

  

  Station 
  4921, 
  surface; 
  49 
  specimens, 
  1.5 
  to 
  9 
  mm. 
  in 
  diameter. 
  

  

  Station 
  4952, 
  surface; 
  3 
  specimens, 
  4 
  to 
  11 
  mm. 
  in 
  diameter. 
  

  

  The 
  specimens, 
  all 
  from 
  Japanese 
  waters, 
  are 
  interesting 
  chiefly 
  

   because 
  they 
  supplement 
  the 
  rather 
  large 
  examples 
  collected 
  by 
  the 
  

   Fisheries 
  steamer 
  Albatross 
  in 
  the 
  eastern 
  Pacific 
  (1911&, 
  p. 
  333). 
  

   The 
  characters 
  which 
  separate 
  pacijica 
  from 
  all 
  specimens 
  of 
  the 
  

   Atlantic 
  umbella 
  yet 
  described, 
  and 
  all 
  the 
  ones 
  which 
  I 
  have 
  studied, 
  

   are 
  the 
  tubercles 
  on 
  the 
  superior 
  surface 
  of 
  the 
  disk, 
  the 
  greater 
  num- 
  

   69077 
  °—Proc.N.M. 
  vol.44— 
  13 
  6 
  

  

  