468 



NORTH AMERICAN INDEX FOSSILS. 



three or five, depressed, continued to or nearly to the column. 

 Siluric. 



17. J. hartley! Schuchert. (Fig. 1776.) Siluric. 



Calyx pear-shaped, strongly sculptured. (Type of genus.) 

 Manlius of West Virginia. 



XL PsEUDOCRiNiTES Pcarcc. 

 Calyx laterally compressed, circular to subquadrate, composed 

 of four cycles (basal cycle of four plates, the succeeding of five, four 



Fig. 1777. Fseudocrinites gordoni, an elongate specimen, with ambulacra drawn over 

 on anal side more than usual, and two views of the holotype. (After Schuchert.) 



and six plates) and a very small plate above these. The laterally 

 placed anal area is composed of a pyramid of seven pieces sur- 

 rounded by an incomplete circle of six to eight pieces. Pectinate 

 rhombs three, one basal and two upper. Ambulacra two, extend- 

 ing along the narrow periphery of the calyx and usually to the 

 column, and beset with biserial jointed pinnules. Siluric. 



18. P. gordoni Schuchert. (Fig. 1777.) Siluric. 



Outline circular. Ambulacra extending to the column. Each 

 ambulacrum with about 80 pinnules. 



Manlius of West Virginia. 



Fig. 1778. Fseudocrinifes clarki, three views of holotype. (After Schuchert.) 



