ON SOME PELMATOZOA FROM CHAZY LIMESTONE OF NEW YORK I3I 



One brachial shows in 1. post. R, but it bears the same orna- 

 mentation. The species is easily recognized by single plates, there 

 being no others that can be confused with it. The fused infra- 

 basals and the absence of a median line up the brachials make the 

 generic reference somewhat doubtful. Each radial has a somewhat 

 raised mound just above the middle and if these are connected with 

 lines convex toward the angles of the inner pentagon, they will 

 outline a raised basal portion and partly outline five depressed in- 

 terradial areas. The species is described here to call attention to 

 an example of fused infrabasals in a member of the Rhodocrinidae 

 and to the internal visceral ridge of the anal interradius. The fused 

 condition of the infrabasals was apparently due to the extreme 

 thinness of the plates. Homoplasy then should perhaps lead us 

 to expect a similar condition of things in Blastoidocrinus and in 

 other species not yet examined. 



I wish in closing to thank many of my students and others who 

 have taken an interest in this decomposed material and have given 

 me valuable help in assorting the same, and I wish also to thank 

 Dr John M. Clarke for the loan of literature connected with the 

 subject and for numerous other courtesies. 



