222 PALJEONTOLOGY OF NEW-YORK. 



89. 1. ORMOCERAS TENUIFILUM? 



Pl. LVIII. Fig3. 2 a, b, c. 

 Reference Ormoccras 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. 



Tlie specimen fig. 2 6, 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 tlie 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 Conularia quad/milcala, Miller. Sowerby, Min. Concliology, Vol. iii, pag. 107, tab. 250. 



— — D.iLMAN, Vet. Acad. Haiidlingar, 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. 



— Suiverbii. Defrance, Diet, des Sci. naturelles. 



— — Bl.\inville, 182S, Malacologie, pag. 377, tab. 14, fig. 2 b, c, d, e. 



— — Troost, 1840, Fifth Geol. Rep. Tennessee. 



— — Verneuil, 1843, Pal. Russ. ar,d 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 

 (he mouth, meet those from the opposite angle in the centre of cacli side, producing a 

 sligiiliy impressed line, along which the ridges arc less prominent; longitudinally marked 

 by finer strise, which are slightly convergent towards the angles, and divergent from the 

 centre of each side ( tliese strite are most prominent in the depressions between the trans- 

 verse ridges ) ; septa transverse, very convex, smooth ; siphuncle 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. 



