Clarkeaster perspinosus nov. 

 Page 30 



(See pi. 5 and 6) 



Abactinal or dorsal view of type specimen (holotype), showing 

 only the basal portions of the large spines. Natural size. 



Actinal or ventral view of paratype. Natural size. 



Devonian : Chemung beds. Avoca, Steuben county, N. Y. 



The photographs are made from gutta-percha squeezes, the molds 

 of which are in the New York State Museum. 



162 



