GEOLOGY OF THE FOURTH DISTRICT. 
ORGANIC REMAINS OF THE CORNIFEROUS LIMESTONE. 
No. 37. —No. 69, 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. Strophomena 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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