66 Review of the New York Geological Reports. 
fossil.entirely relied on, and the rock is known as the ‘Selenurus 
The other trilobite is scarcely less characteristic. In 
many places in the third district, and in Seneca County im the 
fourth district, the Strophomena lineata of Conran is the typical 
fossil, but it rarely occurs at any point west of the last named lo- 
cality.”’* 
Some of the most abundant fossils of Western New York, fig- 
ured in Hauu’s report, are given below. 
Hall's Report, p. 171. 
Delthyris. duodenaria, H. 6. Plewrorhyncus trigonalis, H. 
5. 
Fig. 1. Atrypa scitula, H. 2. Paracyelas elliptica, (like Cyclas.). 3. Strophomena acutiradiata, HW. 4. 
Strophomena crenistria, H. 
* Hall’s report, p. 170. 
