﻿l60 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Genus 
  lecanocrinus 
  Hall 
  

  

  [Ety. 
  : 
  XeyAvri, 
  basin; 
  y.pivov^ 
  lily] 
  

  

  (1852. 
  Pal 
  N. 
  Y. 
  2:199) 
  

  

  This 
  genus 
  differs 
  from 
  Ichthyocrinus 
  only 
  in 
  having 
  a 
  

   rhomboidal 
  anal 
  plate 
  separating 
  the 
  two 
  posterior 
  radials, 
  and 
  fol- 
  

   lowed 
  by 
  a 
  somewhat 
  larger 
  anal 
  interradial. 
  

  

  Lecanocrinus 
  macropetalus 
  Hall 
  (Fig. 
  55) 
  (1852. 
  Pal. 
  N. 
  F. 
  

   2:199, 
  pi. 
  45) 
  

  

  Distinguishing 
  characters. 
  Subglobose 
  calyx; 
  three 
  large 
  infra- 
  

   basals^ 
  the 
  two 
  larger 
  truncated 
  on 
  top; 
  larger 
  basals, 
  two 
  pen- 
  

  

  im 
  

  

  -•A 
  

  

  

  Fig. 
  55 
  Lecanocrinus 
  macropetalus 
  with 
  analysis 
  of 
  calyx 
  

  

  tagonal, 
  one 
  hexagonal 
  and 
  two 
  heptagonal; 
  subquadrangular 
  anal 
  

   plate 
  following 
  on 
  heptagonal 
  basals 
  and 
  succeeded 
  by 
  large 
  inter- 
  

   radial 
  plate; 
  large 
  radials, 
  two 
  pentagonal 
  and 
  three 
  with 
  a 
  short 
  

   sixth 
  side; 
  costals 
  2x5, 
  short, 
  succeeded 
  by 
  distichals 
  and 
  palmars 
  

   similar 
  to 
  Ichthyocrinus 
  laevis; 
  slender 
  stem 
  ; 
  smooth, 
  

   thick 
  joints 
  alternating 
  at 
  irregular 
  intervals 
  with 
  thin 
  ones, 
  and 
  

   having 
  slightly 
  rounded 
  edges 
  and 
  a 
  round 
  canal. 
  

  

  Found 
  in 
  the 
  Rochester 
  shale 
  at 
  Lockport 
  (Hall). 
  May 
  also 
  

   occur 
  at 
  Niagara. 
  

  

  