86 TRANSACTIONS OF THE 
13. Lenticular, light gray, in portions coarsely crys- 
talline, in other portions highly fossiliferous, although 
the fossils are chiefly fragmentary, in still other por- 
tions with thin, very compact, sandy streaks. 
Orthis testudinaria a aa Modiolopsis. 
equivalvis a a. Orthoceras. 
Calymene senaria a a. 
14. Gray, rather coarsely crystalline, with included 
compact nodules. 
The latter contain Calymene senaria and Orthro- 
ceras, the former :— 
Orthis (Dalmanella) testudinariaaaa. —Nucula levata. 
Plectambonites sericea a. Lingula riciniformis. 
Ptilodictya ce. —S=— Fite 
Stictopora. Bryozoan, probably new. 
Prasopora lycoperdon, large celled var. Monticulipora. 
Orthis ( Platystrophia) biforata. Rafinesquina alternata. 
Calymene senaria. Parastrophia hemiplicata.* 
15-19. Series of compact barren layers, respectively 
2’3’; 8’ and 5/ thick alternating with shaly layers 
containing only Plectambonites sericea. 
20-23. A series of gray lenticular beds often composed 
exclusively of an agglomeration of Orthis testudinaria, 
changing abruptly to very compact, barren, heavily 
bedded black limestone, with a few very thin shaly 
partings. 
Orthis testudinaria aaa. Prasopora lycoperdon. 
Calymene senaria. Monticulipora small. 
Rafinesquina deltoidea. Crinoid columns. 
a alternata. Plectambonites sericea. 
24. A rather impure limestone with scattered frag- 
mentary fossils; black, irregular fracture, compact with 
scattered calcite crystals and in portions shaly. 
Prasopora lycoperdon small celled. a. Stenopora fibrosum. 
large celled form a. Ptytodictya. 
Asaphus platycephalus (large) ¢. Strophomena incurvata. 
Clymene senaria c. Rafinesquina alternata. 
Orthis testudinaria ¢c. ————nasuta. 
subsequata. Lingula Curta. 
Bellerophon bilobatus. Beyrichia. 
Diplograptus amplexicaule. Crinoid fragments. 
Nucula levata. Cyrtoceras. 
Tellinomya dubia. Orthoceras vertebrata. 
54? 
[pEc. 16, 
54! g/ 
63’ 
68’ 
T2! 
g/t 
g// 
4? 
9 
*The occurrence of a single specimen of Parastrophia hemiplicata in this layer pos- 
sessed considerable interest. The species is characteristic of the Black River ; occur 
ring in that formation at Watertown, N. Y., associated with Cypricardites latus Hall. 
On Lake Champlain we found it to characterize, in great abundance, a well-marked 
zone, which contaived little else. That zone marks the lowest portion of the Trenton 
for 78 miles along the lake shore. See Trans. N.Y. Acad. Sci., XXV., 20 and 23 (1895). 
