﻿100 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  shortly 
  bifurcates; 
  and 
  close 
  to 
  the 
  margin 
  there 
  is 
  some 
  further 
  

   branching. 
  In 
  a 
  specimen 
  of 
  20 
  mm. 
  the 
  per- 
  and 
  interradials 
  still 
  

   start 
  as 
  a 
  single 
  trunk; 
  but 
  the 
  peripheral 
  branching 
  and 
  anasto- 
  

   mosis 
  is 
  already 
  much 
  more 
  extensive, 
  and 
  the 
  outer 
  third 
  of 
  the 
  

   adradials 
  is 
  now 
  involved 
  in 
  it 
  (pi. 
  5, 
  fig. 
  4), 
  and 
  the 
  margins 
  of 
  all 
  

   the 
  canals 
  are 
  jagged. 
  By 
  the 
  time 
  a 
  diameter 
  of 
  32 
  mm. 
  is 
  reached 
  

   there 
  is 
  a 
  marked 
  advance 
  in 
  the 
  complexity 
  of 
  the 
  branching. 
  

  

  Mouth 
  parts. 
  — 
  Unfortunately 
  the 
  mouth 
  parts 
  are 
  damaged 
  in 
  all 
  

   the 
  specimens 
  ; 
  but 
  so 
  far 
  as 
  can 
  be 
  seen 
  they 
  are 
  of 
  the 
  usual 
  Aurelia 
  

   type. 
  In 
  one 
  example 
  of 
  about 
  100 
  mm. 
  two 
  of 
  the 
  mouth-arms 
  are 
  

   intact; 
  they 
  are 
  slightly 
  longer 
  than 
  the 
  bell 
  radius. 
  

  

  Margin. 
  — 
  The 
  velarium 
  is 
  much 
  broader 
  than 
  in 
  aurita, 
  and 
  the 
  

   oldest 
  of 
  the 
  intertentacular 
  lobes 
  longer 
  and 
  pointed, 
  but 
  there 
  are 
  

   all 
  stages 
  in 
  the 
  development 
  of 
  the 
  latter 
  and 
  of 
  the 
  tentacles. 
  As 
  

   in 
  aurita 
  (p. 
  98), 
  the 
  tentacles 
  arise 
  some 
  distance 
  above 
  the 
  margin, 
  

   the 
  lobes 
  not 
  being 
  discontinuous, 
  but 
  connected 
  with 
  one 
  another 
  

   below 
  the 
  tentacles. 
  

  

  The 
  rhopalia 
  (pi. 
  5, 
  figs. 
  2, 
  3) 
  resemble 
  those 
  of 
  A. 
  aurita 
  in 
  general, 
  

   there 
  being 
  a 
  broad, 
  shallow, 
  radially 
  corrugated 
  exumbral 
  pit 
  above 
  

   the 
  sense 
  club, 
  and 
  below 
  it 
  a 
  narrow, 
  tubular 
  one 
  opening 
  into 
  the 
  

   notch 
  at 
  the 
  bottom 
  of 
  which 
  the 
  latter 
  is 
  situated. 
  The 
  club 
  itself 
  

   stands 
  in 
  an 
  obUque 
  position, 
  neither 
  horizontal, 
  as 
  is 
  usual 
  in 
  aurita, 
  

   nor 
  vertical, 
  as 
  in 
  the 
  form 
  described 
  by 
  Browne 
  (1905) 
  as 
  solida. 
  

  

  The 
  most 
  striking 
  feature 
  of 
  the 
  margin 
  is 
  that 
  velarium, 
  margin, 
  

   and 
  lappets 
  are 
  heavily 
  pigmented. 
  In 
  the 
  preserved 
  specimens 
  they 
  

   are 
  amber-brown, 
  and 
  one 
  of 
  Mertens's 
  figures 
  from 
  life 
  (Brandt, 
  1838) 
  

   shows 
  this 
  same 
  color, 
  but 
  in 
  his 
  other 
  figure 
  they 
  are 
  deep 
  sepia- 
  

   brown. 
  The 
  color 
  is 
  as 
  dense 
  in 
  our 
  specimen 
  of 
  30 
  mm. 
  as 
  it 
  is 
  in 
  

   the 
  larger 
  ones; 
  but 
  in 
  the 
  specimen 
  of 
  60 
  mm. 
  observed 
  by 
  Mertens 
  

   (Brandt, 
  1838, 
  A. 
  hyalina) 
  there 
  was 
  no 
  pigment. 
  

  

  Suborder 
  RHI20ST0MATA. 
  

   Genus 
  MASTIGIAS 
  L. 
  Agassiz, 
  1862. 
  

   MASTIGIAS 
  PAPUA 
  (Lesson) 
  L. 
  Agassiz. 
  

   Cephea 
  papua 
  Lesson, 
  1826, 
  p. 
  122, 
  pi. 
  11, 
  figs. 
  2, 
  3. 
  

  

  (For 
  synonymy, 
  see 
  Mayer, 
  1910, 
  p. 
  678.) 
  

  

  Nagasaki, 
  Japan, 
  surface, 
  August 
  8; 
  3 
  specimens, 
  20-35 
  mm. 
  in 
  

   diameter. 
  

  

  These 
  specimens 
  are 
  apparently 
  identical 
  with 
  the 
  Japanese 
  material 
  

   described 
  by 
  Kishinouye 
  (1895) 
  as 
  M. 
  pliysophora, 
  except 
  that 
  like 
  

   the 
  Japanese 
  specimens 
  studied 
  by 
  Maas 
  (1909) 
  they 
  have 
  lost 
  all 
  color 
  

   in 
  the 
  preservative. 
  As 
  Maas 
  (1903, 
  1909) 
  has 
  shown, 
  physophora 
  is 
  

   at 
  most 
  a 
  variety 
  of 
  papua, 
  with 
  which 
  Mayer 
  (1910) 
  has 
  unequiv- 
  

   ocally 
  united 
  it. 
  I 
  believe 
  the 
  latter 
  is 
  correct. 
  

  

  