JSfEW Species of Grinoidea and other Fossils. 217 



LiCHENOCRINUS CRATERIFORMIS U. Sp. 



Plate 7, fig. 7. 

 Body small, distinctly subpentagonal, subdiscoid, witli an elevated 

 margin and strongly depressed center ; composed of medium-sized 

 polygonal plates. Proboscis minute, central. 



This species differs from the preceding in its more elevated margin, 

 and in the absence of the live prominences of the disc ; the proboscis 

 is much smaller in proportion to the size of the body, and the whole 

 is composed of a smaller number of larger sized plates. 



Forination and locality. In shales of the Hudson-river group ; 

 Oxford, Ohio. 



Genus— CYCLOCYSTOIDES Billings di Salter. 



In the descriptions of fossils accompanying the Report on the Lake 

 Superior Land District,"^ I noticed, without designating by name, a 

 peculiar crinoidean or cystidean body, of which the specimen pre- 

 served showed simply a circular range of small plates, joining each 

 other by their lateral faces. jN'o further notice of this or other simi- 

 lar bodies was given till the publication of the Third Decade of the 

 Organic Remains of Canada, in 1858, where Messrs. Salter and Bil- 

 lings have described two similar forms under the generic name 

 Cyclocystoides, as follows : 



" Generic characters. Discoid, surfaces formed of an integument 

 composed of numerous small granular plates, which appear to be 

 radiately arranged ; margin entirely surrounded by thick subquad- 

 rate plates, each of which presents upon its outer half, two deep 

 obtusely oval excavations. These, in perfect specimens, are covered 

 over by minute polygonal plates, thus forming a tubular channel 

 around the whole animal. This channel appears to have been con- 

 nected with the interior by small pores, penetrating through the 

 marginal plates, there being one pore leading from each of the exca- 

 vations. The margin or (perhaps) disc was also connected with a 

 long tube, like the proboscis of some of the Crinoids, formed of many 

 small polygonal plates." [Can. Org. Rem., Decade iii, p. 86. 1858.] 



A specimen of this genus from the Trenton limestone of Saratoga 

 county differs from any described, and in some respects does not 

 correspond with the generic description given above. The specimen 

 is not quite circular, but is subovate and obscurely pentagonal, with 

 twenty-six submarginal plates, outside of which are two ranges of 

 plates, and surrounding these is a granulose or subreticulate border. 

 The portion outside of the circle of large plates appears to be entire, 



♦ Foster &, Whitney's Report on the Lake Superior Land District, p. 209, pi. xsv, fig. 4 a-c. 1851. 



