l60 NEW YORK STATE MUSEUM 



Genus lecanocrinus Hall 



[Ety.: Af/Avrj, basin; y.plvov^ 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. Y. 

 2:199, pi. 45) 



Distinguishing characters. Subglobose calyx; three large infra- 

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



^ 



f :'-r>% 



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. 



