PLATE TIL 



LiCHENOCRiNUS Dyeri Hall, 1866. 



Page 216. 

 Fig. 1. A specimen of natural size, preserving a portion of the column to the length 



of four inches. 

 Fig. 3. A body with a portion of the column attached, enlarged to three diameters. 

 Fig. 3. Summit of specimen, as it lies attached to the surface of a shell, enlarged 



to four diameters. 

 Fig. 4. Enlarged view of a specimen attached to the shell of Orthis testudinaria, 



the marginal portion showing the interior striae, probably from the action 



of weathering. 

 Fig. 5. The interior of the crinoidal body, as exposed from the weathering and 



removal of the exterior plates, a few of which remain on the lower left 



hand margin of the figure ; enlarged to three diameters. 

 Fig. 6. The lower or attached surface, drawn from a detached specimen, enlarged 



to three diameters. 



LiCHENOCRiNUS CRATERIFORMIS LLoll, 1866. 

 Page 217. 

 Fig. 7. The exposed side of an attached specimen, enlarged to three diameters. It 

 is probable that the larger size of plates and other features of distinction 

 noticed, may be only of varietal importance. 



Pholidops Trentonensis Llall^lQQQ. 



Page 221. 

 Fig. 8. Exterior of the valves, showing the form and lines of growth. The speci- 

 men is somewhat crushed. Enlarged to four diameters. 



Pholidops svbtrvncatus LLall, 1847. 



Page 221. 

 Fig. 9. Exterior view of specimen, enlarged to four diameters. 



Pholidops Cincinnatensis n. sp. 



Fig. 10. A minute oval-ovate shell, differing from the P. suhtruncatus in being regu- 

 larly curved in front. It corresponds very nearly in form with the P. 

 squamiformis of the Niagara group of New York. Enlarged to four 

 diameters. 



Crania Trentonensis Hall, 1866. 



Page 219. 

 Figs. 11, 12. Upper side and profile view of a dorsal valve, showing the general 

 form and characters of the species, natural size. 



Crania setigera Hall, 1866. 



Page 220. 

 Figs. 13, 14. Upper and profile views of a dorsal valve, the specimen enlarged two 

 diameters. 



