68 Review of the New York Geological Reports. 
the same species as one which is abundant both in the Caradoc 
formation of England, and the Hudson River group of New York. 
The Ludlow formation of England, affords a species which 
Morcuison informs us, cannot be distinguished from that of the 
Caradoc. ‘The blue limestone of Cincinnati contains a tentaculi- 
tes, but the specimens on hand are not sufficiently distinct to enable 
one to decide on specific identity. Dr. Cuarp has found a tenta- 
eulites in-the water limestone, but he supposes it to be a new species. 
The figures given by Vanuxem as most abundant in the cor- 
niferous limestone in his district, are the following : 
2. Cyrtoceras undulatus, Vanuxem. 3. Strophomena undulata. 
6 and 7. Ichthyodorulite. 8. Strophomena lineata, Conran. 
Vanuxem’s Report. 
5. Atrypa prisca. 
Fig. 1. Odontocephalus selenurus, Conran. 
4. Orthis lentiformis. 
