EXPLANATION OF PLATE XVII. 

 (All illustrations contributed by Dr. W. B. Clark.) 



HEMIASTER KUMMELI Clark n. sp., p. 303 



1-3. Dorsal, lateral and ventral views of the type specimen. 

 Woodbury clay; Lorillard, (102}. 



HEMIASTER WELLERI Clark n. sp., p. 302 



4-6. Dorsal, lateral and ventral views of the type specimen. 



Merchanti'ille clay-marl; near Jatncsburg, (141}. 



