120 NEW YORK STATE MUSEUM 



Squamaster et al. of the order Streptophiurae. It differs from 

 them in the strong development of the marginal disk plates, the 

 presence of the pipe-bowl-shaped crests, which are not observed 

 in any other genus of the Auluroidea, and further in the large size 

 and development of the adambulacrals which almost come in con- 

 tact on the abactinal side. The fringe of fine spines along the 

 distal extremity is also found in Squamaster and Hallaster, and 

 many other Streptophiurae. 



