﻿R. 
  E. 
  TOMES 
  ON 
  A 
  NEW 
  SPECIES 
  OE 
  CORAL. 
  

  

  95 
  

  

  7. 
  Description 
  of 
  a 
  New 
  Species 
  of 
  Coral 
  from 
  the 
  Middle 
  Lias 
  of 
  

   Oxfordshire. 
  By 
  Eobert 
  F. 
  Tomes, 
  Esq., 
  F.G.S. 
  (Eead 
  

   June 
  22, 
  188.1.) 
  

  

  Since 
  the 
  publication 
  of 
  my 
  paper 
  on 
  the 
  Fossil 
  Corals 
  of 
  the 
  Lias, 
  

   published 
  in 
  the 
  Society's 
  Journal 
  in 
  1878, 
  only 
  one 
  new 
  species 
  

   has 
  to 
  my 
  knowledge 
  been 
  obtained 
  from 
  the 
  Middle 
  Lias 
  of 
  this 
  

   country, 
  although 
  an 
  interesting 
  series 
  has 
  been 
  secured 
  from 
  the 
  

   Angulatus-be&s 
  of 
  the 
  Lower 
  Lias 
  of 
  Worcestershire. 
  I 
  refrain 
  for 
  

   the 
  present 
  from 
  remarking 
  upon 
  the 
  latter, 
  but 
  describe 
  the 
  Middle 
  

   Lias 
  species 
  as 
  follows 
  : 
  — 
  

  

  Fig. 
  1. 
  — 
  Two 
  Galices 
  of 
  Thamnastraea 
  (Synastrsea) 
  Walfordi, 
  Tomes. 
  

   (Three 
  times 
  nat. 
  size.) 
  

  

  llllltffe 
  

  

  Thamnastr^ia 
  (Synastrsea) 
  Waleordi, 
  n. 
  s. 
  

  

  The 
  corallum 
  has 
  a 
  rounded 
  depressed 
  form, 
  and 
  has 
  the 
  upper 
  

   surface 
  evenly 
  and 
  slightly 
  convex. 
  The 
  outer 
  margin 
  is 
  thin. 
  

  

  The 
  calices 
  are 
  round, 
  rather 
  superficial, 
  far 
  apart, 
  and 
  irregu- 
  

   larly 
  placed, 
  but 
  with 
  a 
  tendency 
  to 
  a 
  linear 
  arrangement, 
  either 
  in 
  

   straight 
  lines 
  or 
  curves. 
  

  

  The 
  septa 
  and 
  septal 
  costae 
  are 
  nearly 
  straight, 
  and 
  have 
  a 
  di- 
  

   stinctly 
  radiate 
  composition 
  without 
  any 
  indication 
  of 
  a 
  parallel 
  

   arrangement 
  of 
  the 
  costae. 
  

  

  The 
  union 
  of 
  the 
  costae 
  with 
  those 
  of 
  adjoining 
  calices 
  is 
  usually 
  

   at 
  an 
  angle, 
  which 
  is 
  sometimes 
  very 
  distinct, 
  and 
  probably 
  indi- 
  

   cates 
  the 
  position 
  of 
  a 
  rudimentary 
  wall. 
  

  

  The 
  septa 
  and 
  septal 
  costae 
  are 
  nearly 
  of 
  uniform 
  thickness, 
  many 
  

   of 
  them 
  anastomose 
  near 
  to 
  the 
  columella, 
  into 
  which 
  they 
  pass. 
  

   They 
  are 
  long, 
  rather 
  thin, 
  and 
  there 
  is 
  no 
  indication 
  of 
  their 
  being 
  

   perforate 
  or 
  having 
  a 
  moniliform 
  margin. 
  

  

  The 
  columella 
  is 
  small 
  and 
  composed 
  of 
  papillae. 
  

  

  The 
  synapticulae 
  are 
  rather 
  numerous, 
  distinct, 
  and 
  resemble 
  those 
  

   of 
  typical 
  Fungidae. 
  

  

  