﻿No. 
  1967. 
  A 
  XEW 
  SPECIES 
  OP 
  ACTINIAX—McMURRICH. 
  553 
  

  

  ance 
  of 
  a 
  rounded 
  lobe. 
  Throughout 
  the 
  portion 
  of 
  the 
  pennon 
  

   medial 
  to 
  the 
  point 
  of 
  attachment 
  of 
  the 
  mesentery, 
  the 
  lamellae, 
  

   though 
  branching 
  to 
  a 
  greater 
  or 
  less 
  extent, 
  have 
  a 
  pahsade 
  arrange- 
  

   ment, 
  gradually 
  diminishing 
  in 
  height, 
  however, 
  to 
  a 
  point 
  about 
  

   midway 
  between 
  the 
  attachment 
  of 
  the 
  mesentery 
  and 
  the 
  medial 
  

   edge 
  of 
  the 
  pennon, 
  beyond 
  which 
  point 
  they 
  again 
  rapidly 
  increase 
  

   in 
  height; 
  there 
  is 
  thus 
  a 
  marked 
  separation 
  between 
  a 
  medial 
  and 
  

   a 
  more 
  lateral 
  group 
  of 
  lamellae. 
  

  

  There 
  are 
  about 
  16 
  well 
  developed 
  lamellae 
  in 
  the 
  medial 
  set 
  and 
  

   about 
  9 
  in 
  the 
  more 
  lateral 
  one, 
  while 
  the 
  basal 
  lamella 
  bears 
  about 
  

   14 
  secondary 
  ones, 
  the 
  total 
  number 
  being, 
  therefore, 
  about 
  39 
  or 
  

   40. 
  A 
  shght 
  thickening 
  of 
  the 
  endoderm 
  over 
  the 
  medial 
  edge 
  of 
  

   pennon 
  is 
  noticeable, 
  but 
  it 
  is 
  less 
  pronounced 
  than 
  in 
  many 
  other 
  

   species. 
  

  

  The 
  parietal 
  muscles 
  are 
  very 
  well 
  developed, 
  consisting 
  of 
  about 
  

   8 
  more 
  or 
  less 
  branched 
  lamellae 
  on 
  either 
  side 
  of 
  the 
  main 
  axis, 
  their 
  

   relative 
  breadths 
  being 
  such 
  as 
  to 
  give 
  the 
  cross 
  section 
  of 
  the 
  entire 
  

   muscle 
  a 
  more 
  or 
  less 
  hemispherical 
  or 
  rounded 
  conical 
  outhne. 
  

  

  