﻿14 
  PBOCEEDIXGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  there 
  any 
  distinct 
  basal 
  bulbs. 
  The 
  number 
  of 
  interradials 
  increases 
  

   irregularly 
  with 
  growth. 
  In 
  the 
  smallest 
  specimen, 
  10 
  by 
  11 
  mm., 
  

   there 
  are 
  6, 
  7, 
  9, 
  and 
  6 
  interradials 
  in 
  the 
  four 
  quadrants; 
  in 
  a 
  large 
  

   one, 
  14 
  by 
  18 
  mm., 
  there 
  are 
  10, 
  10, 
  9, 
  9; 
  and 
  in 
  a 
  still 
  larger 
  one, 
  17 
  

   by 
  18 
  mm., 
  10, 
  9, 
  9, 
  10. 
  Ten 
  was 
  the 
  largest 
  number 
  counted 
  in 
  any 
  

   quadrant. 
  

  

  The 
  interradial 
  tentacles 
  are 
  especially 
  interesting 
  because 
  cross 
  

   sections 
  of 
  them 
  show 
  that 
  the 
  stouter 
  ones 
  have 
  a 
  large 
  lumen, 
  

   whereas 
  in 
  smaller 
  ones, 
  either 
  younger 
  or 
  more 
  contracted, 
  the 
  lumen 
  

   is 
  obscured, 
  so 
  that 
  they 
  are 
  apparently 
  sohd, 
  though 
  there 
  is 
  no 
  

   definite 
  core 
  of 
  chordate 
  cells, 
  such 
  as 
  is 
  to 
  be 
  seen 
  in 
  Protiara 
  formosa 
  

   (Mayer, 
  1910, 
  pi. 
  13, 
  fig. 
  2). 
  

  

  Color. 
  — 
  The 
  density 
  of 
  the 
  pigment 
  has 
  been 
  noted 
  above. 
  The 
  

   entire 
  subumbrella, 
  and 
  those 
  parts 
  of 
  the 
  manubrium 
  which 
  lack 
  

   sexual 
  products, 
  are 
  of 
  a 
  very 
  deep 
  claret 
  red, 
  so 
  nearly 
  opaque 
  as 
  to 
  

   look 
  black 
  when 
  held 
  against 
  the 
  light, 
  over 
  which 
  the 
  radial 
  canals 
  

   show 
  as 
  pale 
  bands. 
  The 
  tentacles 
  and 
  velum 
  are 
  of 
  a 
  very 
  pale 
  

   brownish-red, 
  and 
  the 
  coloration, 
  as 
  well 
  as 
  the 
  data 
  of 
  capture, 
  shows 
  

   that 
  the 
  species 
  belongs 
  to 
  the 
  mesoplankton. 
  

  

  Genus 
  PANDEA 
  Lesson, 
  1848. 
  

  

  Mayer 
  (1910) 
  adnfits 
  five 
  species 
  to 
  this 
  genus: 
  conica 
  Lesson, 
  

   violacea 
  Agassiz 
  and 
  Mayer, 
  saltatoria 
  (Sars) 
  Lesson, 
  minima 
  Lenden- 
  

   feld, 
  and 
  maasi 
  Mayer 
  (= 
  Tiara, 
  sp., 
  Maas, 
  19046, 
  p. 
  13, 
  pi. 
  2, 
  fig. 
  11). 
  

   But 
  saltatoria 
  is 
  probably 
  an 
  Aglantha, 
  maasi 
  a 
  Sarsia 
  (S.Jlammea), 
  

   while 
  minima 
  was 
  founded 
  on 
  a 
  young 
  stage. 
  Vanhoffen 
  (1911) 
  has 
  

   united 
  conica 
  and 
  violacea 
  on 
  the 
  supposition 
  that 
  the 
  latter 
  is 
  the 
  

   young 
  of 
  the 
  former. 
  But 
  Mayer 
  (1910) 
  has 
  studied 
  large 
  series 
  of 
  

   violacea, 
  both 
  from 
  the 
  Tortugas 
  and 
  from 
  the 
  Mediterranean, 
  finding 
  

   that 
  the 
  structure 
  of 
  the 
  gonads 
  separates 
  them 
  at 
  all 
  stages. 
  

  

  The 
  collection 
  contains 
  a 
  large 
  species 
  from 
  the 
  intermediate 
  depths, 
  

   referable 
  to 
  Pandea, 
  and 
  resembling 
  conica 
  in 
  the 
  structure 
  of 
  the 
  

   gonads, 
  but 
  readily 
  distinguished 
  from 
  the 
  latter 
  by 
  size, 
  dark 
  red 
  

   color, 
  and 
  other 
  characters 
  noted 
  below. 
  

  

  PANDEA 
  RUBRA, 
  new 
  species. 
  

   Plate 
  2, 
  figs. 
  1-7. 
  

  

  Type— 
  Csit, 
  No. 
  31052, 
  U.S.N.M. 
  

   Station 
  4758, 
  300-0 
  fathoms; 
  1 
  specimen. 
  

  

  Station 
  4760, 
  300-0 
  fathoms; 
  1 
  specimen 
  and 
  fragments 
  of 
  two 
  

   others. 
  

  

  Station 
  4797, 
  300-0 
  fathoms; 
  1 
  specimen. 
  Type. 
  

  

  Station 
  4800, 
  221-0 
  fathoms; 
  2 
  specimens, 
  1 
  very 
  fragmentary. 
  

  

  