Review of the New York Geological Reports. 363 



1. Isotelus gigas. 2. Strophomena deltoidea. 3. Favosites 

 Lycoperdon. 



The same or very analogous species as figures 1, 2, and per- 

 haps 3, occur in the lower part of the blue limestone formation 

 of the West. 



Plate 100, fig. 2. Calymene senaria. 6. Ceraurus pleurexan- 

 themus. 7. Trinucleus tessellatus 7 



Fig. 2, closely resembles the Dudley trilobite, Calymene Blu- 

 menbachii, but supposed to be distinct from it and described by 

 Mr. Conrad under the name of C. senaria; it is one of the most 

 abundant fossils of this rock. Bucklers and post-abdomens of it 



