48* PALEONTOLOGY OF NEW-YORK. 



The transverse ridges are usually from six to eight in the space of three 

 lines; but they are often, for short distances, much more closely 

 crowded. The pustules are less than half as distant from each other as 

 the space between the ridges. 



The specimen figured on Plate cxi is an impression of the exterior of the shell. 

 Another fragment, of four inches in length on one of the angles, has been seen, and 

 one or two smaller fragments of other individuals. It is, however, comparatively a 



rare fossil. 



PLATE CXI. 

 Fig. 1. A fragment preserving the impression of parts of two sides : the extreme length of 

 one side, which is imperfect both above and below, is five inches. 



PLATE LXX A. 

 Fig. 3 a, 6. A figure from a cast made in tlie mould of the shell represented on Plate cxi, 

 and the same enlarged. 



Geological position and locality. In the Oriskany sandstone : Schoharie and the 



Helderberg. 



Coiiulai'ia ? 



I have seen, in the collection of Mr. Whitfield, a small fragment, the apex of a 

 species of Conularia from the Oriskany sandstone : the surface is partially exfoliated; 

 the transverse ridges are thin and sharp, scarcely preserving the granulose crest. It 

 resembles the C. huntiana of the Lower Helderberg limestones. 



CEPHALOPODA. 



A single species of Orthoceras has been found in the Oriskany sandstone, 

 and, with this exception, I am not aware of the occurrence of any ce- 

 phalopodous shells ; none having been observed in my collections from 

 New- York, Maryland or Virginia. 



Orthoceras arenosuiii ( n. s.). 



Shell cylindrical, gradually tapering, abruptly annulated ; annulations 

 distant about one-third the diameter of the shell. Surface unknown. 

 The specimen is a fragment several inches in length, attached to a mass of the 



sandstone containing several characteristic fossils of the rock. 



Geological position and locality. In the Oriskany sandstone : Schoharie. 



