GEOLOGY OF THE FOURTH DISTRICT. 



ORGANIC REMAINS OF THE CORNIFEROUS LIMESTONE. 



No. 35.— No. 67, page 171. 

 Fig. 1. Atrypa scitula, II. Williamsville, Eric county. 

 Fig. 2. Paracyclas elliptica, H. Shell very closely resembling a Cyclas. Le Roy, Genesee 



county. 

 Fig. 3. Strophomena acutiradiata, H. Near Buffalo. 

 Fig. 4. Strophomana crenistria, H. Vienna, Ontario county. 

 Fig. 5. Delthyris duodenaria, H. Five miles east of Buffalo. 

 Figs. 6 and 6 a. Plcurorhyncus trigonalis, H. Williamsville. 



No. 3G — No. 68, page 172. 



Fig. 1. Pterinea? cardiiformis,Y{. Clarence Hollow. 



Fig. 2. Tentaculites scalaris, Schlotiieim (Silurian Researches, p. 643, pi. 19, f. 16). 



Fig. 3. Orthonychia . A new genus, from its resemblance to a claw or talon. There 



are several other species. Williamsville. 



Fif. 4. Euomphalus? rotundus, H. Clarence Hollow. 



Fig. 5. Calymene crassimarginata, H. A common and widely distributed fossil of this lime- 

 stone. Williamsville. 



Fig. 6. Acroculia erecta, H. Williamsville. 



31 



