﻿250 
  

  

  ]\Ir. 
  F. 
  A. 
  Bather 
  on 
  

  

  Sycocrinus 
  anapept 
  imenus. 
  What 
  that 
  form 
  really 
  is, 
  we 
  

   now 
  eiujiiirc. 
  

  

  Sycocrinus 
  anapeptamemis. 
  

  

  Tablet 
  369 
  in 
  the 
  Austin 
  Collection 
  slioukl, 
  according 
  to 
  

   the 
  MS. 
  list, 
  bear 
  three 
  specimens 
  of 
  this 
  species, 
  from 
  the 
  

   Carboniferous 
  Limestone 
  of 
  Settle, 
  Yorkshire. 
  One 
  of 
  these 
  

   specimens 
  has 
  disappeared, 
  as 
  had 
  ah'eady 
  been 
  noted 
  on 
  the 
  

   copy 
  of 
  the 
  list 
  made 
  by 
  a 
  former 
  curator 
  of 
  the 
  museum. 
  

   One 
  of 
  the 
  two 
  remaining 
  specimens 
  proves 
  to 
  be 
  only 
  some 
  

   ])lates 
  of 
  a 
  Pakechinus 
  with 
  no 
  tiace 
  of 
  any 
  crinoid. 
  The 
  

   third 
  specimen 
  is 
  not 
  the 
  one 
  drawn 
  by 
  T. 
  Austin, 
  jun. 
  (our 
  

   PI. 
  X. 
  figs. 
  2-2 
  d), 
  but 
  is 
  of 
  the 
  same 
  general 
  character 
  

   and 
  agrees 
  with 
  the 
  published 
  definition. 
  There 
  is 
  no 
  

   reason 
  for 
  doubting 
  that 
  this 
  extant 
  specimen 
  was 
  among 
  those 
  

   before 
  the 
  Austins 
  when 
  tliey 
  drew 
  up 
  their 
  first 
  account 
  of 
  

   the 
  genus, 
  and 
  I 
  therefore 
  select 
  it 
  as 
  the 
  holotype 
  of 
  the 
  

   species. 
  

  

  IBB 
  

  

  Analysis 
  of 
  the 
  cup 
  of 
  Si/coc7-inns 
  annpeptamenus, 
  lecto-liolotype. 
  Sutul'e- 
  

   liiies 
  iuft^rred 
  from 
  marliiiigs 
  on 
  the 
  internal 
  cast 
  alone, 
  or 
  outlines 
  

   otherwise 
  restored, 
  are 
  in 
  dotted 
  line. 
  The 
  missing 
  portion 
  of 
  

   1. 
  post. 
  R 
  was 
  broken 
  ofl' 
  in 
  removing- 
  the 
  thick 
  gum 
  and 
  matrix 
  

   from 
  the 
  specimen 
  ; 
  the 
  outline 
  is 
  fully 
  warranted. 
  X 
  3 
  diam. 
  

  

  The 
  specimen 
  (PI. 
  X. 
  figs. 
  \ 
  a-\ 
  c) 
  corisists 
  of 
  a 
  theca 
  

   devoid 
  of 
  all 
  plates 
  above 
  tiie 
  radials 
  and 
  somewhat 
  broken, 
  

   but 
  tlie 
  disposition 
  of 
  all 
  the 
  cup-plates 
  can 
  be 
  determined 
  

   (teXt-fig.). 
  The 
  theca 
  is 
  asymmetrical, 
  there 
  being 
  a 
  general 
  

   lessening 
  in 
  height, 
  in 
  all 
  circlets, 
  from 
  the 
  1. 
  post, 
  radius 
  to 
  

   the 
  r. 
  anti 
  interradius. 
  

  

  The 
  height 
  of 
  the 
  theca 
  from 
  the 
  stem-facet 
  to 
  the 
  summit 
  

   of 
  I. 
  post. 
  R., 
  is 
  9-7 
  mm. 
  ; 
  to 
  the 
  summit 
  of 
  the 
  r. 
  ant. 
  inter- 
  

   radial 
  suture, 
  7-1 
  mm. 
  Diameter 
  : 
  autero-posterior, 
  G'4 
  mm. 
  ; 
  

   transverse, 
  about 
  the 
  same. 
  

  

  