EXPLANATION OF PLATE 11. 

 Dactyloidites bulbosus. 



Page 160. 



Fig. 1. A small specimen, showing the six rays marked by concentric lines 



at their distul extremities. 

 Fig. 2. A larger specimen in which the bulbous expansions are distinctly 



stalked. Roofing slate, Middle Granville, N. Y. 



