512 



NORTH AMERICAN INDEX FOSSILS. 



Differs from W. inerope in the absence of angulation of the 

 brachials and in the flatness of the arms. 

 Burlington of Illinois and Iowa. 



45. W. aequalis (Hall). (Fig. 1826.) Mississippic. 

 B extremely tumid. Arms bifurcating several times. 

 Keokuk of Indiana. 



46. W. merope (Hall). (Fig. 1828, a.) Mississippic. 

 Small, somewhat 5-angled from the prominent angulation of the 



brachials. Surface of calyx marked by somewhat nodose radiat- 

 ing ridges. Arms subangular. 

 Waverly of Ohio. 



47. W. elegans (Hall). (Fig. 1827.) Mississippic. 

 Crown elongate, pear-shaped. Arms broad, flattened and closely 



appressed. 



Burlington of Missouri and Iowa. 



XX. EuPACHYCRiNUS Mcck and Worthen. 



Dorsal cup low saucer-shaped. IB small and concealed by the 

 column. B large. IRA and RA both present, the latter very large 



Fig. 1828. a, IVoodocrinus vierope ; b, c, Eupachycrinus mooresi ; d-f, costals 

 of same with spines. (After Whitfield. ) 



and supporting a small plate of the ventral tube. Arms usually 

 10, rarely more. Mississippic-Carbonic. 



48. E. orbicularis (Hall). Mississippic. 



Calyx globular, greatly depressed. Plates smooth. 

 Keokuk of Illinois and Iowa. 



