﻿Mr. 
  J. 
  W. 
  Fewkes 
  on 
  a 
  new 
  Athorybia. 
  209 
  

  

  the 
  peduncle 
  forms 
  a 
  sacculus. 
  The 
  sacculus, 
  s, 
  ordinarily 
  

   forming 
  a 
  bell-shaped 
  covering 
  enveloping 
  a 
  structure 
  known 
  

   as 
  the 
  involucrum, 
  is 
  in 
  our 
  new 
  Californian 
  Athorybia 
  very 
  

   much 
  modified 
  and 
  reduced 
  in 
  size. 
  It 
  is 
  a 
  globular 
  or 
  hemi- 
  

   spherical 
  enlargement 
  which 
  shows 
  the 
  " 
  spongy 
  " 
  cellular 
  

   walls 
  which 
  have 
  been 
  described 
  in 
  the 
  knobs 
  of 
  the 
  genus 
  

   JRkizophysa. 
  On 
  one 
  side 
  this 
  hemispherical 
  sacculus 
  is 
  

   enlarged 
  or 
  extended 
  into 
  a 
  conical 
  projection, 
  recalling 
  the 
  

   beak-like 
  processes 
  of 
  certain 
  of 
  the 
  knobs 
  of 
  the 
  genus 
  Rkizo- 
  

   physa. 
  This 
  portion 
  of 
  the 
  knob 
  likewise 
  shows 
  the 
  charac- 
  

   teristic 
  " 
  spongy 
  " 
  cellular 
  contents. 
  The 
  apex 
  is 
  tipped 
  by 
  

   a 
  conspicuous 
  pigment-spot. 
  

  

  The 
  involucrum, 
  «', 
  takes 
  a 
  single 
  turn, 
  and 
  is 
  seldom 
  

   covered 
  by 
  the 
  sacculus. 
  It 
  is 
  densely 
  pigmented 
  and 
  appa- 
  

   rently 
  formed 
  of 
  well-developed 
  nematocysts. 
  

  

  There 
  is 
  a 
  single 
  terminal 
  median 
  vesicle, 
  tv, 
  and 
  two 
  ter- 
  

   minal 
  filaments, 
  tf. 
  These 
  structures 
  have 
  a 
  close 
  likeness 
  to 
  

   the 
  same 
  bodies 
  in 
  other 
  Physophores, 
  and 
  seem 
  more 
  like 
  

   immature 
  than 
  fully 
  developed 
  knobs. 
  

  

  The 
  size 
  of 
  the 
  whole 
  body, 
  including 
  its 
  length 
  without 
  

   tentacles 
  from 
  the 
  apex 
  of 
  the 
  float 
  to 
  the 
  open 
  end 
  of 
  the 
  

   polypite, 
  is 
  one 
  eighth 
  of 
  an 
  inch. 
  The 
  diameter 
  from 
  one 
  

   tip 
  of 
  the 
  expanded 
  hydrophyllia 
  to 
  that 
  of 
  the 
  opposite 
  has 
  

   the 
  same 
  or 
  approximately 
  the 
  same 
  measurement. 
  The 
  

   animal 
  was 
  taken 
  in 
  the 
  Santa 
  Barbara 
  Channel, 
  off 
  the 
  coast 
  

   of 
  Southern 
  California. 
  

  

  The 
  question 
  naturally 
  arises, 
  Is 
  not 
  this 
  the 
  young 
  of 
  

   some 
  long-stemmed 
  Physophore, 
  like 
  Agalma, 
  as 
  yet 
  unre- 
  

   corded 
  from 
  the 
  Californian 
  waters 
  of 
  the 
  Pacific 
  ? 
  There 
  is 
  

   nothing 
  to 
  prevent 
  our 
  answering 
  this 
  question 
  in 
  the 
  affirma- 
  

   tive, 
  since 
  we 
  know 
  that 
  several 
  genera 
  pass 
  through 
  a 
  similar 
  

   form 
  in 
  the 
  course 
  of 
  their 
  development 
  *. 
  Still 
  the 
  animal 
  

   which 
  we 
  have 
  represented 
  in 
  our 
  Plate, 
  even 
  if 
  a 
  larval 
  form 
  

   of 
  some 
  long-stemmed 
  Physophore, 
  is 
  in 
  certain 
  respects 
  

   different 
  from 
  any 
  larva 
  which 
  has 
  yet 
  been 
  described. 
  

  

  The 
  sexual 
  bodies 
  lie 
  around 
  the 
  bases 
  of 
  the 
  polypites, 
  

   but 
  they 
  are 
  very 
  little 
  developed, 
  a 
  fact 
  which 
  certainly 
  looks 
  

   as 
  if 
  the 
  animal 
  is 
  a 
  larval 
  form. 
  Still, 
  even 
  if 
  they 
  were 
  

   well 
  developed, 
  that 
  fact 
  alone 
  does 
  not 
  indicate 
  that 
  the 
  

   animal 
  is 
  mature, 
  for 
  among 
  the 
  Physophores 
  examples 
  

   might 
  be 
  instanced 
  in 
  which 
  a 
  genus 
  matures 
  its 
  sexual 
  

   products 
  before 
  its 
  adult 
  form 
  is 
  reached. 
  

  

  * 
  In 
  my 
  studies 
  on 
  the 
  Pacific 
  coast 
  I 
  have 
  never 
  taken 
  a 
  long-stemmed 
  

   Pkysuphore 
  of 
  any 
  kind, 
  and 
  I 
  am 
  not 
  aware 
  that 
  others 
  have 
  recorded 
  

   them 
  from 
  the 
  locality 
  where 
  my 
  studies 
  were 
  made. 
  

  

  