170 Review of the New York Geological Reports. 
of this group. Supposing it to be a new species he has given it 
the name of Pinnopsis, from its resemblance to the recent genus 
Pinna. Fig. 8. P. ornatus is distinguished from the preceding 
by the number of ribs. It is a question, however, how far this 
distinction would hold good if a great number of individuals 
d 
Hall's Report, p. 24. 106.) 
Fig. 1. Avicula speciosa. 2. ee aes 3. Beller nsus? 
4. Orthoceras aciculum. 5. Clymenia? complanata. 6. Geniat ites ee 
The species Delthyris levis, Cardium? vetustum, Orthis ten- 
uistriata, Lucina? striata, Nucula lineolata, Astarte subtectilis, 
Bellerophon striatus, Goniatites bicostatus, G. sinuosus, occut 
in the central and higher part of the group. D. levis is found 
only in the vicinity of Cayuga and Seneca lakes. It is the only 
species of the genus Delthyris observed in the fourth ree 
destitute of ribs. C. vetustum occurs in the soft green sh 
one of the above fossils have come under our obebretaibll in 
the ‘western states. Indeed the shale and sandstone above the 
western black slate has as yet yielded but very few fossils. 
