222 
PALAEONTOLOGY OF NEW-YORK. 
89. 1. ORMOCERAS TENUIFILUM'? 
Pl. LVIII. Figs. 2 a, b, c. 
Reference Onnoceras tenuifilum, Plates XV & XVI of this volume. 
The specimen fig. 2 a is a part of a siphuncle, with a small portion of the shell adhering. 
The edges of the annulations are somewhat irregular and more sharply angular than is 
usual in this species, but otherwise it presents no important differences. 
The specimen fig. 2 b, and section 2 c, is a fragment worn down on one side somewhat 
obliquely, showing the siphuncle in the lower part of the figure, which is precisely similar 
to those previously figured. 
These specimens have been given to me, the one by Gen. Spinner, of Mohawk, and 
the other by Dr. Budd, of Turin, Lewis county, as coming from the Trenton limestone. 
It is possible, that in the Mohawk valley, where the Orthoceratite limestone of the Black 
river is not clearly recognized, some of its fossils may be found in the base of the Trenton 
limestone. This is the only explanation I am able to offer at present, if the specimens are 
really from the localities given ; for among many hundreds examined from the central and 
higher part of the Trenton limestone, I have never observed a fragment of the Ormoceras. 
These specimens are figured in this place, though I do not regard them as characteristic 
of the Trenton limestone. 
287. 1. CONULARIA TRENTONENSIS.* 
Pl. LVIII. Figs. 1 a, b, c, d, e,f. 
Compare Conuhiria quadrisulcata. Miller. Sowerby, Min. Conchology, Vol. iii, pag. 107, tab. 260. 
— — Dalman, Vet. Acad. Handlingar, 1824, tab. 4, fig. 3. 
— — Hisinger, Leth. Suecica, 1837, pag. 30, tab. 10, fig. 5. 
— — Sowerby in Sil. Researches, pag. 626, pl. 12, fig. 22. 
— Sowerbii. Defrance, Diet, des Sci. naturelles. 
— — Blainville, 1828, Malacologie, pag. 377, tab. 14, fig. 2 b, c, d, e. 
— — Troost, 1840, Fifth Geol. Rep. Tennessee. 
— — Verneuil, 1845, Pal. Russ, and Ural Mountains, pag. 348, pl. 24, fig. 5 a, b. 
Pyramidal, obtusely quadrangular ; angles sulcate ; sides somewhat rounded ; a slightly 
impressed line along the centre of each side, from the apex to the base; surface marked 
by sharp obliquely transverse ridges, which, extending from each angle of the shell towards 
the mouth, meet those from the opposite angle in the centre of each side, producing a 
slightly impressed line, along which the ridges are less prominent; longitudinally marked 
by finer striae, which are slightly convergent towards the angles, and divergent from the 
centre of each side (these striae are most prominent in the depressions between the trans¬ 
verse ridges ) ; septa transverse, very convex, smooth ; sijihuncle excentric. 
* The Genus Conularia is usually placed under the Family Pteropoda. This species is provided with septa which 
are perforate as in Orthoceras, and, on this account, I have allowed those described to remain under Cephalopoda. 
