TRENTON LIMESTONE. 19% 
Fig. 8 a. Fragments of two specimens connected by the dotted lines. The annulations are represented 
as too broad. 
Fig. 8 6, Section showing the position of the siphuncle. 
Position and locality. This species is only known to me as occurring in the higher 
crystalline portion of the limestone at Watertown, Jefferson county. (State Collection.) 
260. 13. ORTHOCERAS TEXTILE (n. sp.). 
Pu. XLIII. Figs. 1 a, b. 
General figure cylindrical, very gradually tapering, marked by prominent transverse or 
slightly arching annulations, which are distant about one third the diameter of the shell 3 
entire surface marked by fine longitudinal and transverse striz, which are closely arranged, 
the series being equidistant from each other, giving the surface the appearance of a woven 
texture ; septa rather deeply concave, distant about one third of the diameter ; section 
circular ; siphuncle? 
This fossil bears some resemblance to O. calamitewm, as figured by Portiock (Geol. Rep. 
Londonderry, pag. 365, pl. 25, fig. 1 a, 6); but our specimens never present any ‘‘strong 
longitudinal threads or stripes’? passing over the annulations, the striae being uniform in 
this respect. It also differs essentially from O. tubicinella of SowerBy, which we find in our 
Hamilton group. 
Fig. 1 a. A fragment of the natural size. 
Fig. 1 6. A portion of the surface enlarged, to show the strie. 
Position and locality. In the lower concretionary beds of the Trenton limestone at 
Watertown. 
261. 14. ORTHOCERAS BILINEATUM (n. sp.). 
Pu. XLIII. Figs. 2 a, 5, ¢, d. 
Compare Orthoceras calamiteum, Munster, 1839, heft i, pag. 36, pl. 17, fig. 5; Ip. 1840, heft ii, p. 102. 
= — D’ArcuiAc & DE VERNEUIL, 1842, Trans. Geol. Soc. London, 2d series, Vol. vi, 
— — Portiock, Geol. Rep. Londonderry, 1843, pag. 365, pl. 25, fig. 1. [p. 346. 
— — Vernevit, Pal. Russia and the Ural Mountains, 1845, pag. 353, pl. 25, fig. 5. 
General form cylindrical, gradually tapering, marked by slightly arched or undulating 
rounded annulations distant about two fifths the diameter; surface marked by longitudinal 
sharp elevated lines, which alternate with finer lines in equal number ; transversely marked 
by fine scarcely visible stria, which are interrupted by the longitudinal lines; section 
circular ; siphuncle excentric. 
The two series of longitudinal lines, one being more than twice the elevation of the 
other, are distinguishing features of this fossil. The annulations are more arched on the back 
