﻿48 
  PROCEEDIXGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  44. 
  

  

  nitely 
  one 
  way 
  or 
  the 
  other 
  many 
  more 
  Crossotas 
  from 
  various 
  locali- 
  

   ties 
  must 
  be 
  studied 
  with 
  an 
  eye 
  to 
  their 
  variation. 
  And 
  as 
  nor- 
  

   vegica 
  is 
  very 
  much 
  closer 
  to 
  hrunnea 
  than 
  is 
  either 
  of 
  the 
  two 
  new 
  

   species 
  in 
  the 
  collection, 
  the 
  wisest 
  course 
  is 
  to 
  class 
  it 
  for 
  the 
  present 
  

   as 
  a 
  variety 
  of 
  th(> 
  former. 
  

  

  The 
  two 
  new 
  species 
  agree 
  with 
  hrunnea 
  in 
  their 
  general 
  form, 
  in 
  the 
  

   structure 
  of 
  the 
  gonads, 
  in 
  the 
  arrangement 
  of 
  the 
  tentacles 
  in 
  several 
  

   rows, 
  and 
  one 
  of 
  them 
  at 
  least 
  in 
  the 
  structure 
  of 
  the 
  sensory 
  clubs; 
  

   but 
  the 
  gonads 
  in 
  both 
  are 
  borne 
  at 
  or 
  below 
  the 
  mid-level 
  of 
  the 
  bell 
  

   in 
  the 
  adult 
  instead 
  of 
  near 
  the 
  apex, 
  while 
  one 
  has 
  a 
  gelatinous 
  

   peduncle. 
  The 
  presence 
  of 
  a 
  peduncle 
  is 
  so 
  important 
  a 
  character 
  

   that 
  it 
  might 
  be 
  made 
  the 
  basis 
  of 
  a 
  new 
  genus. 
  But 
  it 
  seems 
  to 
  me 
  

   that 
  to 
  do 
  so 
  would 
  tend 
  to 
  obscure 
  the 
  obvious 
  affinity 
  of 
  the 
  

   medusa 
  in 
  question 
  to 
  the 
  other 
  species 
  of 
  Crossota, 
  and 
  that 
  it 
  is 
  there- 
  

   fore 
  wiser 
  to 
  refer 
  it 
  to 
  that 
  genus. 
  Pigmentation, 
  too, 
  helps 
  to 
  sepa- 
  

   rate 
  one 
  of 
  them 
  in 
  which 
  it 
  is 
  restricted 
  to 
  the 
  manubrium. 
  

  

  The 
  four 
  members 
  of 
  Crossota 
  may 
  be 
  summarized 
  as 
  follows: 
  

  

  A. 
  No 
  peduncle. 
  

  

  1. 
  Gonads 
  hanging 
  from 
  canals 
  close 
  to 
  apex. 
  Subumbrella 
  pigmented. 
  

  

  a. 
  Gonads 
  appear 
  first 
  when 
  bell 
  is 
  about 
  16 
  mm. 
  in 
  diameter 
  hrunnea. 
  

  

  h. 
  Gonads 
  visible 
  in 
  specimens 
  only 
  80 
  mm. 
  in 
  diameter 
  

  

  hrunnea, 
  var. 
  norvegica. 
  

  

  2. 
  Gonads 
  hanging 
  from 
  radial 
  canals 
  at 
  about 
  the 
  mid-level 
  of 
  bell. 
  Manubrium 
  

  

  heavily 
  pigmented, 
  but 
  subumbrella 
  unpigmented 
  alba, 
  new 
  species. 
  

  

  B. 
  Manubrium 
  situated 
  on 
  a 
  gelatinous 
  peduncle; 
  gonads 
  at 
  or 
  below 
  mid 
  -level 
  of 
  

  

  bell; 
  subumbrella 
  pigmented 
  pedunculata, 
  new 
  species. 
  

  

  CROSSOTA 
  BRUNNEA 
  Vanhoffen, 
  var. 
  NORVEGICA 
  Vanhbffen. 
  

  

  Crossota 
  norvegica 
  Vanhoffen, 
  19026, 
  p. 
  75. 
  — 
  Mayer, 
  1910, 
  p. 
  390, 
  hg. 
  249. 
  

   Crossota 
  hrunnea 
  (part) 
  Bigelow, 
  1909a, 
  p. 
  135. 
  

  

  Station 
  4758, 
  300-0 
  fathoms; 
  5 
  good 
  specimens. 
  

  

  Station 
  4759, 
  300-0 
  fathoms; 
  7 
  fragmentary 
  specimens. 
  

  

  Station 
  4760, 
  300-0 
  fathoms; 
  12 
  specimens. 
  

  

  Station 
  4763, 
  300-0 
  fathoms; 
  23 
  specimens. 
  

  

  Station 
  4764, 
  1,130-0 
  fathoms; 
  3 
  specimens. 
  

  

  Station 
  4766, 
  300-0 
  fathoms; 
  38 
  specimens. 
  

  

  Station 
  4767, 
  300-0 
  fathoms; 
  15 
  specimens. 
  

  

  Station 
  4793, 
  300-0 
  fathoms; 
  33 
  specimens. 
  

  

  Station 
  4797, 
  300-0 
  fathoms; 
  1 
  specimen. 
  

  

  Station 
  4800, 
  300-0 
  fathoms; 
  18 
  specimens. 
  

  

  The 
  specimens 
  range 
  from 
  4 
  mm. 
  to 
  22 
  mm. 
  in 
  diameter, 
  and 
  as 
  a 
  

   whole 
  they 
  are 
  in 
  a 
  fair 
  condition, 
  while 
  one, 
  18 
  mm. 
  in 
  diameter, 
  is 
  

   more 
  nearly 
  perfect 
  than 
  anj^ 
  example 
  of 
  Crossota 
  previously 
  recorded. 
  

   They 
  are 
  thimble-shaped, 
  with 
  a 
  deep 
  bell 
  and 
  with 
  the 
  exumbrella 
  

   marked 
  by 
  a 
  large 
  number 
  of 
  shallow 
  meridional 
  fuiTOWs 
  just 
  as 
  in 
  

   Vanhoffen's 
  material, 
  and 
  I 
  can 
  definitely 
  announce 
  that 
  the 
  adult 
  

   Crossota 
  has 
  sense 
  clubs. 
  Vanhoffen 
  has 
  already 
  described 
  them 
  in 
  a 
  

  

  