NIAGARA FALLS AND VICINITY jrc 



with E u c a 1 y p t o c r i n u s fragments and other crinoids, as well 

 as other fossils. 



Stephanocrinus g^emmiformis Hall (Fig. 49) (1852. Pal. N. Y. 

 2:215, pi. 48) 



Distinguishing characters. Sharply 



triangular base; rapidly enlarging 



^■'n^'^T ^^h^^ which is rotund in the middle 



and slightly contracted toward the sum- 





t? 



\ VW/^7 ^i^' Upper margin of radials scarcely 



"^r ^ depressed or excavated; granular non- 



Fig. 49 stephanocrinus gemmiformis marinate surfacc of platcs ; sligfhtlv con- 



-with analysis of calyx . ^ ■> is j 



verging coronal processes. 

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

 at Niagara. 



Order caimb^r^t^ Wachsmuth & Springer 

 Genus thysanocrinus Hall 

 [Ety. : duaavo^ , fringe; y.pvMr^^ lily] 

 (1852. Pal. N. Y. 2:188) 

 Calyx deep, with a dicyclic base. Infrabasals and basals five 

 each, the former pentagonal, the latter generally hexagonal. Radials 



'1 







\jj. ^^^ 



.K 



'^~~-%-^> 





Fig. 50 Thysanocrinus liliiformis with analysis of calyx 



five, hexagonal, laterally in contact, except at the azvgous side, where 

 they are separated by an anal plate which is succeeded bv three in- 



