﻿106 
  TwEJs 
  TV-EIGHTH 
  REPORT 
  OX 
  THE 
  STATE 
  MUSEUM. 
  

  

  CORALS 
  AXD 
  BEYOZOA. 
  

   STREPTELASMA 
  Hall. 
  

   Streptelasma 
  radicals. 
  

  

  Plate 
  5, 
  Figs. 
  1-4. 
  

  

  Streptelasma 
  (Aulacophyllum 
  ?) 
  radicans 
  Hall,. 
  Doc. 
  Edit. 
  28th. 
  Rep. 
  St. 
  Mub. 
  

   Nat. 
  Hist. 
  Explanation 
  of 
  pi. 
  5, 
  figs. 
  1-4. 
  1876. 
  

  

  Corallum 
  simple 
  turbinate, 
  usually 
  irregular 
  in 
  its 
  growth 
  

   below, 
  or 
  truncate, 
  from 
  attachment 
  to 
  other 
  bodies 
  ; 
  some- 
  

   times 
  with 
  radiciform 
  extensions, 
  often 
  curved 
  near 
  the 
  base 
  ; 
  

   calyx 
  circular, 
  deep 
  ; 
  dissepiments 
  strong 
  ; 
  a 
  section 
  shows 
  

   twenty 
  to 
  twenty-two 
  extending 
  half-way 
  to 
  the 
  center, 
  with 
  

   an 
  equal 
  number 
  of 
  short 
  intermediate 
  ones. 
  A 
  single 
  speci- 
  

   men 
  cut 
  longitudinally 
  shows 
  no 
  horizontal 
  diaphragms, 
  and 
  

   the 
  inner 
  margin 
  of 
  the 
  rays 
  are 
  crenulate. 
  

  

  Exterior 
  strongly 
  marked 
  by 
  the 
  radiating 
  ridges 
  of 
  the 
  dis- 
  

   sepiments, 
  and 
  usually 
  pretty 
  regularly 
  enlarging 
  from 
  the 
  

   base, 
  though 
  sometimes 
  showing 
  irregularities 
  due 
  to 
  contrac- 
  

   tion 
  and 
  expansion 
  of 
  growth. 
  Height 
  of 
  specimens 
  from 
  25 
  

   to 
  40 
  mm. 
  

  

  This 
  species 
  is 
  of 
  common 
  occurrence 
  in 
  the 
  Waldron 
  

   locality. 
  

  

  Streptelasma 
  (Duncanella) 
  borealis. 
  

  

  Plate 
  5, 
  Figs. 
  7, 
  8. 
  

  

  Duncanella 
  borealis 
  Nicholson. 
  Aim. 
  and 
  Mag. 
  Nat. 
  Hist., 
  4th 
  series, 
  vol. 
  

   xiii. 
  1874. 
  

  

  Streptelasma 
  minima 
  Hall. 
  Doc. 
  Edit. 
  28th 
  Rep. 
  St. 
  Mus. 
  Nat. 
  Hist. 
  Explana- 
  

   tion 
  of 
  pi. 
  5. 
  1876. 
  

  

  Corallum 
  simple 
  elongate-obconical 
  ; 
  calyx 
  deep, 
  circular, 
  

   scarcely 
  expanding 
  at 
  the 
  margins 
  beyond 
  the 
  general 
  en- 
  

   largement 
  of 
  growth 
  ; 
  rays, 
  coarse 
  and 
  strong 
  ; 
  epitheca 
  

   strongly 
  marked 
  by 
  vertical 
  strife 
  indicating 
  the 
  rays, 
  and 
  

   usually 
  by 
  distinct 
  striae 
  of 
  growth 
  which 
  sometimes 
  obscure 
  

  

  