GEOLOGY OF THE FOURTH DISTRICT. 
ORGANIC REMAINS OF THE CORNIFEROUS LIMESTONE. 
No. 35.—No. G7, page 171. 
Fig. 1 . Atrypa scitula, H. Williamsville, Erie county. 
Fig. 2. Paracyclas eUiptica , FI. Shell very closely resembling a Cyclas. Le Roy, Genesee 
county. 
Fig. 3. Strophomena acutiradiata, II. Near Buffalo. 
Fig. 4. Strophomana crenistria, H. Vienna, Ontario county. 
Fig. 5. Pelthyris duodenaria, H. Five miles east of Buffalo. 
Figs. 6 and 6 a. Pleurorluyncus trigonalis, H. Williamsville. 
No. 36 — No. 68, page 172. 
Fig. 1 . Pterinea? cardiifonnis, H. Clarence Hollow. 
Fig. 2. Tentaculites scalaris, Schlotheim (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. 
Fig. 4. Euomphalus? rotundus, H. Clarence FIollow. 
Fig. 5. Calymene crassimarginata, FI. A common and widely distributed fossil of this lime¬ 
stone. Williamsville. 
Fig. 6. Acroculia erecta, IF. Williamsville. 
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