﻿228 
  Prof. 
  Carl 
  Chun 
  on 
  the 
  

  

  days 
  in 
  glasses. 
  Moreover, 
  no 
  convolutions 
  can 
  be 
  recog- 
  

   nized 
  in 
  it, 
  although 
  it 
  is 
  difficult 
  to 
  get 
  a 
  view 
  of 
  it 
  on 
  

   account 
  of 
  the 
  closely 
  packed 
  groups 
  with 
  their 
  orange- 
  

   coloured 
  cnidaria. 
  I 
  shall 
  have 
  to 
  call 
  attention 
  to 
  a 
  similar 
  

   conversion 
  of 
  the 
  stem 
  into 
  a 
  disciform 
  plate 
  in 
  a 
  Diphyid. 
  

   The 
  genus 
  Halopyramis 
  certainly 
  stands 
  near 
  the 
  genus 
  

   Cymba, 
  under 
  which, 
  however, 
  Esehscholtz 
  certainly 
  united 
  

   creatures 
  of 
  very 
  different 
  kinds. 
  It 
  is 
  possible 
  that 
  Cymba 
  

   enneagonum 
  [Enneagonum 
  hyalinum, 
  Quoy 
  et 
  Gaimard*), 
  

   which 
  has 
  been 
  so 
  frequently 
  determined 
  erroneously, 
  is 
  

   related 
  to, 
  if 
  not 
  identical 
  with, 
  Halopyramis 
  adamant 
  ina. 
  

   Quoy 
  and 
  Gaimard 
  certainly 
  ascribe 
  to 
  it 
  a 
  small 
  inferior 
  

   calyx, 
  and 
  therefore 
  afterwards 
  referred 
  it 
  to 
  Diphyes 
  ; 
  but 
  it 
  

   is 
  conceivable 
  that 
  here 
  we 
  have 
  a 
  confusion 
  with 
  a 
  genital 
  

   nectocalyx 
  of 
  a 
  Eudoxia 
  already 
  far 
  advanced 
  in 
  develop- 
  

   ment. 
  

  

  Halopyramis 
  is 
  perfectly 
  transparent 
  ; 
  in 
  large 
  specimens 
  

   the 
  eight 
  angles 
  and 
  the 
  umbiellar 
  margin 
  of 
  the 
  calyx 
  are 
  of 
  

   a 
  yellowish 
  colour 
  ; 
  sometimes 
  yellowish 
  spots 
  also 
  appear 
  on 
  

   the 
  subumbrella. 
  The 
  oval 
  oil-drops, 
  as 
  well 
  as 
  those 
  in 
  the 
  

   hydrophyllium 
  of 
  the 
  Cuboides, 
  have 
  an 
  orange 
  lustre. 
  The 
  

   polypes 
  shimmer 
  emerald-green 
  beneath 
  the 
  urticating-pad. 
  

  

  Cuboides 
  adamantina 
  represents 
  one 
  of 
  the 
  largest 
  and 
  most 
  

   splendid 
  Eudoxise. 
  The 
  cuboidal 
  hydrophyllium 
  with 
  its 
  

   aliform 
  ly 
  produced 
  edges 
  and 
  concave 
  lateral 
  surfaces 
  attains 
  

   a 
  size 
  of 
  10 
  millim., 
  and 
  the 
  older 
  gonocalyces 
  are 
  of 
  the 
  same 
  

   length. 
  On 
  the 
  yellowish 
  oil-receptacle 
  the 
  fluid-cells 
  occur- 
  

   ring 
  on 
  the 
  ventral 
  surface 
  of 
  the 
  lateral 
  diverticula 
  may 
  be 
  

   recognized 
  by 
  the 
  naked 
  eye. 
  

  

  Cuboides 
  vitreus, 
  Huxley, 
  resembles 
  it, 
  but 
  is 
  distinguished 
  

   by 
  the 
  shorter 
  dorsal 
  surface 
  of 
  the 
  hydrophyllium 
  (which 
  is 
  

   much 
  produced 
  in 
  C. 
  adamantina). 
  Favoured 
  by 
  its 
  size 
  

   and 
  transparency 
  I 
  was 
  enabled 
  to 
  trace 
  out 
  many 
  minute 
  

   histological 
  details, 
  upon 
  which 
  I 
  will 
  not 
  enter 
  here, 
  better 
  

   than 
  in 
  any 
  other 
  Eudoxia. 
  

  

  Halopyramis 
  and 
  the 
  Cuboides 
  belonging 
  to 
  it 
  appeared 
  

   singly 
  and 
  rarely 
  during 
  January 
  and 
  February. 
  

  

  From 
  the 
  revision 
  of 
  the 
  Canarian 
  Monophyidee 
  here 
  given 
  

   it 
  appears 
  that 
  their 
  Eudoxias 
  are 
  remarkably 
  different 
  from 
  

   one 
  another. 
  They 
  belong 
  to 
  the 
  two 
  families 
  of 
  the 
  Eudox- 
  

   idae 
  and 
  Ersasidse 
  distinguished 
  by 
  Hackel, 
  with 
  the 
  sub- 
  

  

  * 
  ' 
  Voyage 
  de 
  l'Astrolabe 
  ' 
  : 
  Zool. 
  Zooph. 
  pi. 
  v. 
  tigs. 
  1-6, 
  vol. 
  iv. 
  

   p. 
  100; 
  Ann. 
  Sci. 
  Nat. 
  vol. 
  x. 
  (1827), 
  p. 
  18, 
  pi. 
  ii. 
  1). 
  tigs. 
  1-6. 
  

  

  