1895. ] NEW YORK ACADEMY OF SCIENCES. 83 
This zone is especially characterized by abundant specimens 
of Leperditia fabulites and glabelle of Illenus crassicauda. 
Crinoid fragments a. Orthoceras. 
Avicula Trentonensis ce. Cyrtoceras tenuistriatus. + 
Cypricardites obtusus ventricosus ¢. Asaphus platycephalus. ¢ 
Raphistoma Americana c. Conularia small sp. 
Zygospira recurvirostra C. ' — Rhynchotrema ineequlvalvis. 7 
Rafinesquina alternata. Tsochilina small sp. 
Strophomena filitexta* c. Bathyurus extans. 
Stictopora c. Orthis ct. pectinella subequata. 
Nueula levata. Bellerophon sp. 
Tellinomsya nasuta. —— smail sp. 
Holopea small sp. Protaria vetusta. 
Murehisonia. Modiolopsis. 
Following this about fifteen feet of strata are probably cov- 
ered, before succeeding beds are reached on the opposite side of 
the field, in a small lime quarry adjacent to an old kiln on the 
west side of the roadway, and extending up the side hill be- 
hind it. 
9. More or less irregular and fractured layers, two inches to 
one foot thick, partly crystalline and partly shaly, dark gray, 
breaking in layers, densely packed with Orthis (Dalmanella) 
testudinaria, with some Plectambonites sericea and scattered 
fragments of Asaphus platycephalus, Bellerophon bilobatus and 
Calymene SCLC AO NE erga eee aie em nen severe cate 32 feet. 
10. Very compact, black, thin bedded, shaly limestone, with 
crystalline bands, shown in the quarry and for 22 feet up the 
hill, the remainder of the hill being overgrown. It contains 
few fossils, principally Rafinesquina alternata, also Orthis tes- 
tudinaria and Prasopora lycoperdon. 
Upon the south side of the same hill, however, about one- 
* Strophomena (Leptena) filitexta as figured by Hall, Pal. N. Y., Vol. I., p. 111, PI. 
XXXI.B., figs. 3 a-fand as found in the Lake Champlain valley isa broad, very slightly 
concave species. Winchell and Schuchert, however, in* Pal. Minn. III., pt. 1, pp. 385- 
388, make the Trenton limestone forms of this species synonomous with Strophomena 
incurvata Shepherd (Producta incurvata Shep. A. J. S. XXXIV., 144, figs. 1 and 2 
1838) and indicate for it quite as. strongly convex a character and outline as in our 
Black River specimens in this zone. We place it provisionally under this latter name. 
Except for its strong convexity and almost semi-circular margin, the specimens agree 
with VS. filitexta in the character of both external and internal ornamentation. 
+ Cyrtoceras corniculum Hall (Geol. Rep. Wis. 1862, pp. 41 and 441) proved to be a 
preoccupied name, and Hall therefore proposed to substitute for it the specific name 
tenuistriatum. in S. A. Milller’s Am. Pal. Foss. First Ed. p. 243. The species is newly 
figured under the latter name by Whitfield in Mem. Am. WTUIEES ING Ble ea JAN B.co Pe 
tA hypostome found in this material measures 2!4 x 134 inches, which, in propor- 
tion to one figured in Pal. N. Y., I., Pl. 62, indicates an Asaphus havi ing a length of 
fifteen inches! 
2 The specimens from this zone correspond to Hall’s figures of Atrypa increbescens. 
Pal. N. Y., I.; Pl. 33, fig. 18 e and fig. 13 k. The former figure according to Winchell 
and Schuchert, Pal. Minn. III., pt. ah p. 459, is R. inequivalvis Castelnau, while the 
latter is R. capax Conard. As our specimens most closely resemble figs. 15, 16 and 18 
on plate 34 of the Pal. Minn. cited, I place them under Castelnau’s specific name. 
| Rathbone brook is the original locality of this species according to VANUXEM (Geol. 
3d district, p. 55) as well as Trocholites ammonius Conrad. 
