﻿54 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  44. 
  

  

  not 
  clear, 
  however, 
  whether 
  there 
  was 
  a 
  regular 
  alternation 
  in 
  this 
  

   respect, 
  such 
  as 
  is 
  so 
  evident 
  in 
  ellinorae. 
  All 
  of 
  the 
  tentacles 
  are 
  

   broken 
  off. 
  

  

  Sensory 
  clubs. 
  — 
  The 
  sense 
  clubs 
  closely 
  resemble 
  those 
  of 
  Ilalicreas. 
  

   They, 
  like 
  the 
  tentacles, 
  are 
  grouped, 
  lying 
  in 
  the 
  perradial 
  regions 
  in 
  

   the 
  space 
  between 
  the 
  two 
  tentacle 
  groups 
  wliicJi 
  flank 
  each 
  radial 
  

   canal, 
  three 
  in 
  each 
  group 
  (Hartlaub 
  shows 
  four). 
  Each 
  club 
  con- 
  

   sists 
  of 
  an 
  cctodormic 
  sheath, 
  and 
  a 
  clear 
  entodcrmic 
  core 
  (pi. 
  4, 
  fig. 
  4), 
  

   but 
  the 
  boundaries 
  and 
  nuclei 
  of 
  the 
  entodermic 
  cells 
  which 
  were 
  

   visible 
  in 
  the 
  clubs 
  of 
  Halicreas 
  (1909a, 
  pi. 
  33, 
  fig. 
  8) 
  could 
  not 
  be 
  

   made 
  out 
  here, 
  and 
  none 
  of 
  them 
  now 
  contain 
  otoliths. 
  

  

  Color. 
  — 
  In 
  formalin 
  the 
  manubrium 
  and 
  canals 
  are 
  pale 
  reddish- 
  

   brown. 
  

  

  Family 
  GERYONIDAE 
  Eschscholtz, 
  1829. 
  

  

  Genus 
  "LIRIOPE 
  Lesson, 
  1843. 
  

  

  The 
  "species" 
  of 
  Liriope, 
  like 
  those 
  of 
  most 
  other 
  oceanic 
  medusae 
  

   common 
  enough 
  to 
  find 
  theu' 
  way 
  often 
  into 
  literatm-e, 
  have 
  long 
  been 
  

   a 
  fertile 
  field 
  for 
  discussion. 
  Various 
  characters 
  have 
  been 
  used 
  as 
  the 
  

   basis 
  for 
  specific 
  separation, 
  but 
  as 
  a 
  historical 
  siu'vey 
  would 
  be 
  out- 
  

   side 
  the 
  field 
  of 
  the 
  present 
  paper, 
  it 
  will 
  suffice 
  to 
  say 
  that 
  the 
  only 
  

   one 
  which 
  has 
  stood 
  the 
  test 
  of 
  time 
  is 
  the 
  shape 
  of 
  the 
  gonads; 
  and 
  

   even 
  this 
  one 
  must 
  be 
  used 
  with 
  due 
  regard 
  to 
  the 
  changes 
  in 
  form 
  

   assumed 
  by 
  these 
  organs 
  durmg 
  their 
  growth. 
  

  

  Ah 
  the 
  Liriopes 
  in 
  the 
  present 
  coUection 
  belong 
  to 
  the 
  type 
  with 
  

   triangular 
  gonads 
  which 
  I 
  have 
  caUed 
  tetrapJiylla, 
  but 
  for 
  which 
  

   Maas 
  (1909) 
  uses 
  the 
  name 
  rosacea 
  (he 
  applies 
  tetrapJiylla 
  to 
  a 
  form 
  

   with 
  rounded 
  or 
  oval 
  gonads 
  close 
  to 
  the 
  ring 
  canal, 
  which, 
  as 
  he 
  

   points 
  out, 
  is 
  the 
  same 
  as 
  the 
  eastern 
  Pacific 
  form 
  ^\-ith 
  similar 
  

   features, 
  which 
  I 
  left 
  unnamed). 
  

  

  In 
  the 
  eastern 
  Pacific 
  coUection 
  I 
  found 
  a 
  growth 
  series 
  connecting 
  

   specimens 
  with 
  triangular 
  gonads 
  with 
  the 
  large 
  specimens 
  in 
  which 
  

   the 
  gonads 
  are 
  pentagonal 
  (compacta, 
  Maas) 
  , 
  and 
  as 
  there 
  is 
  a 
  contin- 
  

   uous 
  series 
  of 
  stages 
  in 
  growth 
  from 
  the 
  triangular 
  to 
  the 
  pentagonal 
  

   form, 
  correlated 
  with 
  a 
  general 
  increase 
  in 
  bodily 
  size, 
  it 
  is 
  fauiy 
  

   demonstrated 
  that 
  the 
  latter 
  is 
  an 
  older 
  stage 
  of 
  the 
  former. 
  Maas, 
  

   too, 
  in 
  his 
  most 
  recent 
  communication 
  on 
  the 
  Indo-Pacific 
  Liriopes 
  

   (1909), 
  no 
  longer 
  distmguishes 
  sharply 
  between 
  the 
  two, 
  if 
  I 
  read 
  

   him 
  aright. 
  

  

  The 
  Liriope 
  with 
  triangular 
  gonads 
  is 
  recorded 
  from 
  the 
  Atlantic 
  by 
  

   Vanhoffen, 
  Maas, 
  and 
  Mayer; 
  and 
  I 
  myself 
  have 
  studied 
  numerous 
  

   specimens 
  of 
  this 
  type 
  from 
  the 
  West 
  Indies, 
  so 
  it 
  is 
  evidently 
  at 
  

   home 
  in 
  the 
  warm 
  waters 
  of 
  all 
  three 
  great 
  oceans, 
  though, 
  according 
  

   to 
  ^laas, 
  it 
  is 
  not 
  yet 
  known 
  from 
  the 
  Mediterranean. 
  As 
  Van- 
  

   hoffen 
  pointed 
  out 
  (1902&), 
  this 
  triangular-gonad 
  form 
  merges 
  into 
  

  

  