CANADIAN FOSSILS. 85 



I have placed E. Bigsbyi in the order Asteriadae, because its 

 structure appears to me to be more like that of the Star-fishes than 

 that of the Cystidefe. None of the Cystidese have ambulacra whose 

 pores penetrate through the covering of the body, and therefore all 

 such genera as Edrioaster, Agelacrinites and Hemicystites, belong to a 

 very different division of the Echinodermata. "When v^e knov^ more 

 of their structure it is probable that they will be arranged as a 

 sub-order, for which the name Edrioasferida v^ould be appropriate, 

 as it would suggest their sessile condition on the one hand, and on 

 the other their affinity to the Asteriadse. 



