GEOLOGY OF THE FOURTH DISTRICT. 



ORGANIC REMAINS OF THE CORNIFEROUS LIMESTONE. 



No. 37. — No. G9, page 174. 



Fig. 1. Ichthyodorulite. Undetermined. Victor, Ontario county. 



No. 38. — No. 70, page 175. 

 Fig. 1. Odontocephalus selenurus, Conrad. (Asaphus selenurus, Eaton. Calymene odonto- 



cephala. Green.) 

 Fig. 2. Cyrtoceras undulatum, Vanuxem (Geol Report). 

 Fig. 3. Slropkomena undulata, V. (Geol. Report). 

 Fig. 4. Orthis lentiformis, V. (Geol. Report). 

 Fig. 5. Atrypa prisca. 



Figs. 6 and 7, Ichthyodorulite, and section of the same. 

 Fig. 8. Strophomena lineata, Conrad (Annual Reports). 



The fossils of this illustration, with the exception of 3, 5 and 8, are not as abundant in this 

 rock in the Fourth District, as those preceding. 



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