﻿82 
  ME. 
  F. 
  R. 
  COWPER 
  REED 
  ON 
  THE 
  [Feb. 
  1 
  89 
  7, 
  

  

  to 
  allow 
  of 
  one's 
  feeling 
  sure 
  of 
  its 
  affinities. 
  Murchison's 
  species 
  

   Lucina 
  ? 
  Hisingeri, 
  1 
  from 
  Gotland, 
  also 
  bears 
  comparison 
  with 
  our 
  

   form. 
  

  

  Modiolopsis 
  ?, 
  sp. 
  

  

  Harkness 
  recorded 
  Modiolopsis 
  Nerei 
  (Miinster) 
  from 
  Keisley. 
  2 
  

   There 
  is 
  a 
  specimen 
  in 
  the 
  Woodwardian 
  Museum 
  with 
  that 
  name 
  

   attached 
  to 
  it, 
  but 
  it 
  is 
  a 
  mere 
  fragment, 
  and, 
  in 
  addition 
  to 
  feeling 
  

   sure 
  that 
  this 
  identification 
  is 
  erroneous, 
  I 
  have 
  grave 
  doubts 
  even 
  

   about 
  the 
  genus 
  to 
  which 
  it 
  should 
  be 
  referred. 
  The 
  anterior 
  

   portion 
  of 
  a 
  left 
  (?) 
  valve, 
  probably 
  of 
  a 
  circular 
  shape 
  when 
  perfect, 
  

   with 
  a 
  small 
  inconspicuous 
  beak 
  some 
  distance 
  from 
  the 
  anterior 
  (?) 
  

   border 
  of 
  the 
  shell, 
  with 
  the 
  surface 
  ornamented 
  with 
  concentric 
  

   striae 
  — 
  these 
  are 
  all 
  the 
  characters 
  visible, 
  and 
  they 
  are 
  quite 
  

   inadequate 
  for 
  identification. 
  

  

  ECHINODERMATA. 
  

   Cystidea. 
  

  

  Sphjeronites 
  piriformis 
  (Forbes). 
  

  

  Forbes 
  describes 
  this 
  species 
  as 
  Caryocystites 
  pyriformis 
  3 
  from 
  

   the 
  Chair 
  of 
  Kildare, 
  but 
  none 
  of 
  his 
  specimens 
  showed 
  the 
  ar- 
  

   rangement 
  of 
  the. 
  plates. 
  Our 
  specimen, 
  though 
  imperfect, 
  shows 
  

   distinctly 
  five 
  tiers 
  of 
  large 
  pentagonal 
  or 
  hexagonal 
  plates 
  some- 
  

   what 
  irregularly 
  arranged, 
  but 
  it 
  is 
  too 
  incomplete 
  to 
  allow 
  of 
  any 
  

   certainty 
  as 
  to 
  the 
  number 
  or 
  position 
  of 
  the 
  plates 
  in 
  each 
  tier. 
  

   There 
  are, 
  however, 
  five 
  basal 
  plates 
  to 
  be 
  made 
  out, 
  and 
  these 
  with 
  

   three 
  lateral 
  tiers 
  and 
  the 
  summit-plates 
  compose 
  the 
  test. 
  The 
  

   length 
  of 
  our 
  specimen 
  is 
  about 
  18 
  millim. 
  

  

  The 
  species 
  has 
  also 
  been 
  recorded 
  from 
  Rhiwlas. 
  4 
  

  

  Crinoidea. 
  

  

  Only 
  portions 
  of 
  the 
  stems 
  of 
  various 
  crinoids 
  5 
  have 
  so 
  far 
  been 
  

   found 
  in 
  the 
  Keisley 
  Limestone. 
  Consequently, 
  it 
  is 
  impossible 
  with 
  

   this 
  unsatisfactory 
  material 
  to 
  determine 
  the 
  genera 
  and 
  species 
  ; 
  

   as 
  there 
  are, 
  however, 
  several 
  well-marked 
  types 
  of 
  stems 
  which 
  

  

  1 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  iii. 
  (1847) 
  p. 
  24, 
  woodcut; 
  F. 
  Romer, 
  

   < 
  Leth. 
  Errat.,' 
  p. 
  87, 
  pi. 
  vi. 
  fig. 
  7, 
  & 
  p. 
  101, 
  pi. 
  viii. 
  fig. 
  2 
  (Palajont. 
  Abhandl. 
  

   ii. 
  1885). 
  

  

  2 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xxi. 
  (1865) 
  p. 
  249. 
  

  

  3 
  Mem. 
  Geol. 
  Surv. 
  vol. 
  ii. 
  pt. 
  ii. 
  (1848) 
  p. 
  515, 
  pi. 
  xxi. 
  fig. 
  1. 
  

   * 
  Ibid. 
  vol. 
  iii. 
  2nd 
  ed. 
  (1881) 
  p. 
  476. 
  

  

  5 
  Holm 
  mentions 
  crinoidal 
  remains 
  from 
  the 
  Zep&gtta-Limestone, 
  Sver. 
  

   Geol. 
  Undersokn., 
  ser. 
  c, 
  no. 
  115, 
  pp. 
  14, 
  15 
  (Stockholm, 
  1890). 
  

  

  