﻿50 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  44 
  

  

  While 
  neither 
  is 
  perfect, 
  the 
  type 
  having 
  lost 
  the 
  musculature 
  over 
  

   most 
  of 
  the 
  subumbrclla, 
  the 
  two 
  together 
  give 
  a 
  good 
  idea 
  of 
  the 
  

   species. 
  The 
  exumbreha 
  is 
  furrowed 
  by 
  a 
  large 
  number 
  of 
  shallow 
  

   meridional 
  grooves, 
  just 
  as 
  it 
  is 
  in 
  C. 
  hrunnea; 
  indeed, 
  this 
  seemingly 
  

   trivial 
  feature 
  is 
  characteristic 
  of 
  the 
  whole 
  genus. 
  The 
  entire 
  sub- 
  

   umbrella, 
  as 
  shown 
  by 
  the 
  specimen 
  from 
  station 
  5050, 
  is 
  clothed 
  wdth 
  

   a 
  powerful 
  musculature 
  of 
  circular 
  fibers, 
  and 
  the 
  rather 
  broad 
  velum 
  

   is 
  also 
  very 
  muscular. 
  

  

  The 
  manubrium 
  in 
  the 
  type 
  is 
  about 
  9 
  mm. 
  long 
  by 
  1.5 
  mm. 
  broad, 
  

   cylindrical, 
  sessile 
  on 
  the 
  subumbrella 
  (that 
  is, 
  without 
  peduncle), 
  

   and 
  the 
  mouth 
  is 
  surrounded 
  by 
  four 
  pomted 
  lips 
  (pi. 
  3, 
  fig. 
  9). 
  Di- 
  

   gestive 
  and 
  labial 
  portions 
  are 
  sharply 
  defined 
  by 
  the 
  fact 
  that 
  the 
  

   pigmentation 
  is 
  limited 
  to 
  the 
  former. 
  In 
  the 
  other 
  specimen 
  the 
  

   manubrium 
  is 
  much 
  contracted 
  (pi. 
  3, 
  fig. 
  11). 
  

  

  The 
  eight 
  sausage-shaped 
  gonads, 
  which 
  hang 
  free 
  in 
  the 
  bell 
  

   cavity, 
  being 
  attached 
  only 
  at 
  one 
  end, 
  are 
  situated 
  on 
  the 
  radial 
  

   canals 
  only 
  about 
  one- 
  third 
  of 
  the 
  meridional 
  distance 
  above 
  the 
  mar- 
  

   gm 
  (pi. 
  3, 
  figs. 
  9, 
  11) 
  and 
  fortunately 
  they 
  are 
  so 
  well 
  preserved 
  that 
  

   there 
  is 
  no 
  doubt 
  about 
  their 
  form 
  and 
  location. 
  

  

  Marginal 
  organs. 
  — 
  Most 
  of 
  the 
  tentacles 
  are 
  broken 
  short 
  off 
  in 
  

   both 
  specimens, 
  but 
  their 
  stumps 
  are 
  well 
  preserved 
  in 
  both, 
  and 
  the}' 
  

   are 
  especially 
  clear 
  in 
  the 
  type, 
  which 
  is 
  not 
  contracted 
  at 
  all. 
  The 
  

   tentacles 
  are 
  arranged 
  in 
  three 
  irregular 
  rows 
  (pi. 
  3, 
  fig. 
  10) 
  as 
  in 
  C. 
  

   hrunnea, 
  the 
  oldest 
  being 
  farthest 
  from, 
  the 
  youngest 
  closest 
  to, 
  the 
  

   margin, 
  and 
  each 
  tentacle 
  root, 
  of 
  course, 
  connects 
  \\ath 
  the 
  circular 
  

   canal. 
  In 
  the 
  type 
  there 
  are 
  large 
  stumps 
  opposite 
  five 
  of 
  the 
  radial 
  

   canals, 
  but 
  none 
  to 
  correspond 
  with 
  the 
  other 
  three. 
  The 
  number 
  

   of 
  tentacles 
  per 
  octant 
  is 
  23, 
  24, 
  24, 
  17, 
  22, 
  25, 
  20, 
  24, 
  a 
  total 
  of 
  179, 
  

   that 
  is, 
  only 
  about 
  one-third 
  as 
  many 
  as 
  in 
  C. 
  hrunnea 
  of 
  about 
  the 
  

   same 
  size. 
  The 
  few 
  tentacles 
  which 
  are 
  not 
  broken 
  off 
  are 
  soft 
  and 
  

   so 
  much 
  damaged 
  that 
  there 
  is 
  nothing 
  to 
  say 
  about 
  them 
  except 
  that 
  

   they 
  evidently 
  do 
  not 
  have 
  any 
  distal 
  spine-like 
  portion. 
  

  

  The 
  sense 
  clubs 
  (pi, 
  3, 
  fig. 
  12) 
  are 
  small, 
  and 
  each 
  contains 
  a 
  single 
  

   termmal 
  concretion. 
  They 
  were 
  seen 
  in 
  l)oth 
  specimens, 
  but 
  evi- 
  

   dently 
  most 
  of 
  them 
  had 
  been 
  lost, 
  so 
  all 
  I 
  can 
  say 
  as 
  to 
  their 
  number 
  

   is 
  that 
  the}'' 
  were 
  apparently 
  not 
  more 
  than 
  half 
  as 
  numerous 
  as 
  the 
  

   tentacles. 
  

  

  Color. 
  — 
  The 
  digestive 
  portion 
  of 
  the 
  manubrium 
  is 
  chocolate- 
  

   browTi, 
  so 
  densely 
  pigmented 
  that 
  it 
  is 
  almost 
  black. 
  So 
  far 
  as 
  can 
  be 
  

   seen 
  from 
  surface 
  views 
  (I 
  did 
  not 
  wish 
  to 
  section 
  either 
  of 
  the 
  speci- 
  

   mens) 
  the 
  pigmentation 
  is 
  purely 
  entodermic. 
  The 
  lips 
  are 
  not 
  pig- 
  

   mented. 
  Except 
  for 
  the 
  manubrium, 
  the 
  animal 
  is 
  colorless, 
  though 
  

   the 
  subumbral 
  musculature 
  is 
  higlily 
  iridescent. 
  

  

  