NATURAL SCIENCES OF PHILADELPHIA. 409 



curved ; cardinal teeth single, quite distinct ; lateral teeth not much elongated, 

 strong. 



Long. 6-16 ; lat. 6-16 ; diam. 4-16 inches. 



Hab. N. America, in the region of Lake Superior. 



(Cabinet. Agassiz and Prime.) 



The triangular and very tumid form of this species is quite singular ; it 

 differs from the Sph. Vermontanumin being more tumid, fuller, in having 

 larger beaks and in being much less broad at the base. The young shell is 

 more elongated and less tumid than the adult. A rare species. 



14. Sph. f 1 a v u m, Prime. 



Cgclasjlava, Prime, Bost. Proc, iv. 155, 1851. 



Animal not observed. 



Shell transversely rounded, compressed, equilateral, delicate, margins gene- 

 rally rounded, the posterior a little distended ; beaks central, not full, more 

 or less depressed ; valves very slight, interior whitish ; sulcations pretty deep, 

 regular ; epidermis light, of a greenish yellow color ; cardinal teeth small, 

 in the shape of the letter V reversed ; lateral teeth elongated. 



Long. 7-liJ ; lat. 5-16 ; diam. 3-16 inches. 



Hab. N. America, at the Sault St. Marie, Lake Superior. 



(Cabinet. Agassiz, Jay and Prime.) 



This is a very slight and delicate species, quite distinct from any others but 

 the Sph. patella, to which it bears some general resemblance from its shape ; 

 it is, however, more compressed, less high, and the exterior of the valves is 

 very different, as they are nearly smooth in Dr. Gould's shell. Found not 

 unplentifully in the one locality. 



(To be continued.) 



Descriptions of New Palaeozoic Fossils from Kentucky and Indiana. 



BY SIDNEY S. LYON. 



ECHINODERMATA. 



CRINOIDEA. 



Genus CYATHOCRINUS Miller, 1821. 



Cyathockixus levicolus, n. s. Plate iv., fig. 1. 



Calyx subcorneal, truncate at its junction with the column, from which it 

 expands upward. The pieces composing the calyx are smooth, united in a 

 distinct groove. Basal pieces 5, pentangular, equal in size, slightly concave at 

 the junction with the column. Subradials 5, four of which are of the same 

 size, hexagonal in form, the fifth is a little larger than the others ; it is trun- 

 cated at its summit, thus receiving an additional side. Radial pieces 5, simi- 

 lar in form, septagonal, grooved on their upper margin at their junction with 

 the second primary radial pieces. These being absent in our specimen, their 

 form is iinknown. One anal piece is present, it is small, resting upon the 

 right oblique upper margin of the largest piece forming the first circle above 

 the basal pieces. One or more have fallen out, the space is quadrangular, a 

 little higher than wide, having the same width and placed immediately above 

 the truncated summit of the largest piece forming the subradial circle. Co- 

 lumnar facet large, opening large and nearly round. 



Dimensions. 

 Height of calyx, from column to summit of first radials, -19-100 inch. 



Diameter of base at its junction with column '16-100 " 



Diameter of calyx at summit of first radials "20-100 " 



1861.] 



