if FORMATIONS OF ORDOVICIAN AGE. 43 
Camarella inornata n. sp. 
Rhynchotrema inequivalvis (Castel.). 
Rhinidictya sp. undet. 
Ctenodonta nasuta (Hall). 
Cyrtodonta? sp. undet. 
Hormotoma salteri Uly. 
Orthoceras sp. undet. 
Bumastus trentonensis (/imm.). 
. Arges tuberculatus n. sp. 
. Calymene senaria Con. 
. Leperditia fabulites (Con.). 
16. Leperditella ornata. n. sp. 
1%. Eurychilina oculifera n. sp. 
“2 SD Or 
Bee Re 
mR WH OO H 
18. Hurychilina jerseyensis ni. sp. 
19. Beyrichia sp. undet. 
Leperditia fabulites is by far the most abundant species in this 
fauna, a characteristic which stamps it as belonging to the Black River 
horizon; but the presence of such species as Streptelasma corniculum 
and Rhynchotrema inequivalvis suggests that it occurs near the sum- 
mit of the beds referable to that horizon. 
From the higher beds at the same locality the following fauna was 
secured : 
1. Prasopora simulatrix Uly. 
2. Monotrypa sp. undet. 
3. Rhinidietya sp. undet. 
4. Callopora sp. undet. 
5. Crania sp. undet. ; 
6. Rafinesquina alternata (Kimm.). 
7%. Plectambonites sericeus (Sow.). 
8. Strophomena wncurvata (Shep.). 
9. Platystrophia biforata (Schl.). 
10. Dalmanella testudinaria (Dal.). 
11. Scenidium anthonensis Sard. 
12. Parastrophia hemiplicata (Wall). 
13. Zygospira recurvirostris (Hall). 
i 14. Orthoceras sp. undet. 
15. Isotelus gigas De Kay. 
16. Bumastus trentonensis (mm.). 
17. Proetus latimarginatus n. sp. 
