﻿456 
  KEV. 
  G. 
  E. 
  WHIDBOKNE 
  DESCRIPTION 
  OF 
  THE 
  [Aug. 
  1 
  897, 
  

  

  Ch. 
  sorclida 
  (Sowerby) 
  1 
  will, 
  I 
  expect, 
  probably 
  prove 
  to 
  be 
  a 
  

   synonym 
  of 
  Ch. 
  sarcinulata. 
  

  

  Ch. 
  tenuicostata, 
  QEhlert, 
  2 
  seems 
  distinguished 
  by 
  its 
  much 
  more 
  

   erect 
  spines. 
  

  

  Crinoid-remains. 
  

  

  Locality. 
  Oakhampton. 
  

  

  Fragmentary 
  grouped 
  stems 
  occasionally 
  occur. 
  In 
  one 
  specimen 
  

   are 
  seen 
  several 
  minute 
  rootlets 
  of 
  five 
  or 
  six 
  joints 
  grouped 
  round 
  

   these 
  stems, 
  but 
  they 
  are 
  too 
  vague 
  to 
  give 
  definite 
  character. 
  

  

  Crinoid-segm 
  en 
  t 
  . 
  

  

  Locality. 
  Treborough. 
  Limestone 
  above 
  the 
  slate-quarry. 
  

  

  A 
  single 
  segment 
  is 
  in 
  a 
  good 
  state 
  of 
  preservation. 
  It 
  is 
  circular, 
  

   rather 
  short, 
  with 
  a 
  periphery 
  formed 
  by 
  the 
  revolution 
  of 
  a 
  vertical 
  

   semicircle. 
  The 
  articulating 
  surface 
  is 
  concave, 
  bounded 
  by 
  an 
  

   impressed 
  circular 
  line, 
  within 
  which 
  are 
  33 
  impressed 
  radii 
  about 
  

   the 
  central 
  channel, 
  which 
  appears 
  to 
  be 
  in 
  the 
  form 
  of 
  a 
  four- 
  

   pointed 
  star. 
  

  

  Sponge-spicule. 
  

  

  Locality. 
  Treborough. 
  Limestone. 
  

  

  Size. 
  Fragment, 
  2 
  cm. 
  

  

  A 
  minute 
  fossil, 
  apparently 
  a 
  spicule, 
  is 
  on 
  the 
  same 
  slab 
  as 
  the 
  

   above-named 
  crinoid-segment. 
  It 
  consists 
  of 
  six 
  rods 
  in 
  one 
  plane, 
  

   meeting 
  in 
  a 
  focus 
  from 
  which 
  a 
  seventh 
  rod 
  rises 
  perpendicularly. 
  

  

  ClADOCHONTTS 
  ? 
  (PI. 
  XXXIII. 
  fig. 
  8.) 
  

  

  Locality. 
  Treborough. 
  

  

  Size. 
  30 
  or 
  40 
  mm. 
  

  

  Two 
  specimens 
  of 
  free-branching 
  organisms 
  of 
  small 
  size 
  appear 
  

   to 
  me 
  to 
  belong 
  to 
  this 
  genus, 
  but, 
  being 
  in 
  their 
  state 
  of 
  preserva- 
  

   tion, 
  little 
  more 
  than 
  elongated 
  cylinders 
  or 
  cones, 
  which 
  seem 
  at 
  

   intervals 
  to 
  thicken 
  and 
  divaricate 
  into 
  two 
  or 
  more 
  branches 
  the 
  

   length 
  of 
  which 
  cannot 
  be 
  traced, 
  it 
  is 
  impossible 
  to 
  decide 
  their 
  

   nature. 
  They 
  seem 
  less 
  regular 
  than 
  most 
  species 
  of 
  Cladochonus, 
  

   but 
  they 
  may 
  be 
  compared 
  with 
  C. 
  Schliiteri, 
  Holzapfel, 
  3 
  which 
  

   appears 
  to 
  present 
  a 
  similar 
  irregularity. 
  

  

  Petraia 
  sp. 
  (PI. 
  XXXIII. 
  figs. 
  6,6a& 
  7.) 
  

  

  Locality. 
  Treborough. 
  Four 
  specimens. 
  

  

  Size. 
  About 
  20 
  mm. 
  high, 
  15 
  mm. 
  wide. 
  

  

  Description. 
  Cup 
  irregularly 
  conical, 
  small, 
  rather 
  elongate. 
  

   Septa 
  19 
  or 
  20, 
  thin, 
  smooth. 
  No 
  tabulae 
  or 
  developments. 
  One 
  

  

  1 
  1840. 
  Sowerby, 
  Trans. 
  Geol. 
  Soc., 
  ser. 
  2, 
  vol. 
  v. 
  pt. 
  iii. 
  pi. 
  liii. 
  fig. 
  5. 
  

  

  2 
  1883. 
  OEhlert, 
  Bull. 
  Soc. 
  geol. 
  France, 
  ser. 
  3, 
  vol. 
  xi. 
  p. 
  515 
  & 
  pi. 
  xiv. 
  fig. 
  2. 
  

  

  3 
  1895. 
  Holzapfel, 
  Abh. 
  k. 
  Preuss. 
  geol. 
  Landesanst., 
  n. 
  s., 
  pt. 
  xvi. 
  p. 
  305 
  & 
  

   pi. 
  xvi. 
  figs. 
  1, 
  2, 
  4, 
  5, 
  7. 
  

  

  