﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  SIPHONOPHORAE—BIGELOW. 
  51 
  

  

  CROSSOTA 
  PEDUNCULATA, 
  new 
  species. 
  

   Plate 
  3, 
  fig. 
  13. 
  

  

  Fisheries 
  steamer 
  Albatross 
  station 
  3066, 
  June 
  13, 
  1889, 
  46° 
  26' 
  N. 
  

   124° 
  26' 
  W. 
  (just 
  north 
  of 
  the 
  mouth 
  of 
  the 
  Columbia 
  River), 
  50-0 
  

   fathoms; 
  4 
  specimens, 
  respectively 
  14, 
  19, 
  24, 
  and 
  25 
  mm. 
  in 
  diam- 
  

   eter. 
  

  

  Type.—€&t. 
  No. 
  31057, 
  U. 
  S. 
  N. 
  M. 
  

  

  Those 
  specimens, 
  from 
  the 
  collection 
  of 
  the 
  United 
  States 
  National 
  

   ^fuseum, 
  had 
  been 
  in 
  alcohol 
  for 
  over 
  20 
  years 
  when 
  they 
  came 
  mto 
  

   my 
  hands, 
  and 
  they 
  are 
  not 
  in 
  good 
  condition. 
  But 
  fortunately 
  they 
  

   show 
  their 
  more 
  important 
  anatomical 
  features 
  clearly. 
  

  

  In 
  general 
  form, 
  and 
  in 
  the 
  extent 
  of 
  their 
  pigmentation, 
  they 
  

   resemble 
  C. 
  hrunnea 
  so 
  closeh^ 
  that 
  I 
  had 
  no 
  doubt 
  I 
  was 
  dealing 
  with 
  

   that 
  species 
  until 
  I 
  observed 
  the 
  location 
  of 
  the 
  gonads 
  and 
  the 
  pe- 
  

   duncle 
  on 
  which 
  the 
  manubrium 
  is 
  borne. 
  The 
  exumbrella, 
  as 
  in 
  

   hrunnea, 
  is 
  ribbed 
  wdth 
  numerous 
  fine 
  meridional 
  furrows, 
  while 
  both 
  

   subumbrella 
  and 
  velum 
  are 
  very 
  muscular. 
  

  

  Manubrium. 
  — 
  In 
  the 
  two 
  specimens 
  in 
  which 
  it 
  is 
  intact 
  the 
  

   manubrium 
  is 
  flask-shaped, 
  situated 
  at 
  the 
  end 
  of 
  a 
  short 
  cyUn- 
  

   drical 
  neck. 
  On 
  dissection 
  it 
  proved 
  that 
  the 
  neck 
  is 
  a 
  solid 
  gelati- 
  

   nous 
  peduncle, 
  though 
  it 
  is 
  not 
  readily 
  identifiable 
  as 
  such 
  from 
  a 
  

   surface 
  view, 
  because 
  it, 
  like 
  the 
  rest 
  of 
  the 
  subumbrella, 
  is 
  densely 
  

   pigmented. 
  On 
  sectioning 
  the 
  digestive 
  apparatus 
  lengthwise 
  it 
  is 
  

   evident 
  that 
  the 
  peduncle, 
  about 
  5 
  mm. 
  long, 
  is 
  C3'hndrical, 
  and 
  

   the 
  eight 
  radial 
  canals 
  can 
  be 
  followed 
  lengthwise 
  over 
  it, 
  just 
  as 
  

   in 
  Aglantha. 
  The 
  manubrium 
  itself 
  is 
  much 
  contracted, 
  but, 
  so 
  far 
  

   as 
  can 
  be 
  seen, 
  it 
  resembles 
  the 
  corresponding 
  organ 
  in 
  C. 
  brunnea. 
  

  

  Gonads. 
  — 
  The 
  gonads 
  are 
  sausage-shaped, 
  attached 
  by 
  the 
  upper 
  

   end 
  only, 
  and 
  hanging 
  free 
  in 
  the 
  bell 
  cavity, 
  as 
  in 
  other 
  Crossotas. 
  

   In 
  the 
  smallest 
  specimen 
  (14 
  mm.) 
  they 
  are 
  attached 
  to 
  the 
  canals 
  

   about 
  one-third 
  of 
  the 
  meridional 
  distance 
  below 
  the 
  apex; 
  in 
  the 
  

   19 
  mm. 
  specimen 
  they 
  are 
  at 
  about 
  the 
  mid-level 
  of 
  the 
  subum- 
  

   brella 
  (pi. 
  3, 
  fig. 
  13); 
  and 
  in 
  the 
  25 
  mm. 
  specimen 
  they 
  are 
  about 
  

   one-third 
  of 
  the 
  meridional 
  distance 
  above 
  the 
  margin. 
  Apparently, 
  

   then, 
  the 
  gonads 
  become 
  progressively 
  lower 
  and 
  lower 
  with 
  the 
  

   growth 
  of 
  the 
  bell. 
  

  

  Tentacles. 
  — 
  The 
  tentacles 
  are 
  very 
  closely 
  crowded 
  together, 
  in 
  

   three 
  or 
  four 
  irregular 
  rows, 
  the 
  oldest 
  and 
  largest 
  being 
  farthest 
  

   from 
  the 
  margin, 
  just 
  as 
  in 
  C. 
  brunnea. 
  In 
  the 
  smallest 
  specimen 
  

   there 
  are 
  about 
  75 
  to 
  the 
  octant; 
  in 
  the 
  19 
  mm. 
  one, 
  upward 
  of 
  80. 
  

   In 
  the 
  lai-gest 
  they 
  are 
  too 
  much 
  damaged 
  to 
  count. 
  In 
  all 
  of 
  the 
  

   specimens 
  there 
  are 
  a 
  few 
  very 
  young 
  ones, 
  on 
  the 
  margin. 
  No 
  

   sense-clubs 
  could 
  be 
  detected. 
  

  

  Color. 
  — 
  The 
  color 
  is 
  not 
  very 
  well 
  preserved, 
  but 
  it 
  apparently 
  

   was 
  of 
  much 
  the 
  same 
  reddish-brown 
  as 
  in 
  C. 
  brunnea, 
  and 
  the 
  

  

  