62 Review of the New York Geological Reports. 
Those on the following plate have been selected by Vanuxem 
both as common and exclusive species of the group. 
Vanuxem's Report. 37.) 
ig. 1. Orthocera constrictum. 2. Cypricardites recurra. 3. Avicula flabella. 
4. Orbicula grandis. 
The following are given by Hall as the prevailing forms in 
different parts of the group. 
Hall’s Report. (78.) 
oblonga. 5. N. lineata. 6. Tellina? ovata, 7. Nucula bellatula, 
. Modiol 
ellerophon patulus.. Microdon bellastriata, 3. Cucullea opima. 4. Nucula 
a 
truncata. 9 4 concentrica, 
ul: 
8. Cypricardia 
