156 



Cincinnati Society of Natural History. 



Sometimes it seems to be slightly curved. All the specimens 

 are casts and very smooth. We are not sure that it is a 

 Hyolithes, but if it is not it is quite anomalous, and deserves 

 a specific name. Fragments of trilobites occur in the same 

 association, but they are beautifully preserved, the tubercles 

 on Calymene never appearing better; while this species is 

 like HyoIitJies versaillescnsis, with which it is associated, and 

 it would seem, therefore, impossible that it should represent 

 the broken spines of trilobites. 



It is quite common in the upper part of the Hudson River 

 Group, at Versailles, Indiana, associated with Palcroconcha 

 faberi, Cyclora pulcella, Hyolithes versaillcsensis, and other 

 small fossils. It is in the collections of both authors. 



Agelacrinus faberi S. A. Miller. 



Plate 8, Fig. 24, natural size ; Fig. 25, magnified two diameters. 



This species is founded upon a single specimen, that is very 

 much broken up and attached to the valve of an Orthis occi- 

 dentalis. It is about the size of an average Agelacrinus cin- 

 cinnatiensis. The body is circular, depressed planoconvex, 

 and composed of numerous squamiform plates that imbricate 

 inward from the periphery toward the center. The larger 

 plates occur in the rim that surrounds the extremities of the 

 arms. The arms are much broken up in our specimen, but 

 there seem to be four sinistral and one dextral, composed of 

 interlocking plates, as is usual in this genus. The surface of 

 all the plates is densely and beautifully tuberculated. 



This species is distinguished from all others, in rocks of the 

 same age, by the tuberculated plates. It is also distinguished 

 from Agelacrinus cincinnatiensis and A. pileus by the absence 

 of the great number of small plates that form the periphery 

 in those species, and also by having the larger plates of the 

 body, in the rim, that surrounds the ends of the rays. 



Found by Mr. C. h. Faber, in whose honor the specific 

 name is proposed, in the extreme upper part of the Hudson 

 River Group, about half way between Osgood and Versailles, 

 Indiana, and now in his collection. 



