PTEROPODA. 189 



interior and the exterior, with the thickness of the shell, is shown in the 

 small circular figure. The specimen, figure 3, is an extremely elongated 

 tubular body in compact limestone; but its surface characters are entirely 

 obliterated by weathering. In a single small block of shaly limestone there 

 are three similar forms — one of which shows obscure transverse markings 

 (plate XXXII A, figure 3). 



At a locality of the higher beds of the limestone in Erie county, some 

 tubular bodies which I refer to this species are very abundant. The shell 

 is thick and converted into spathic calcite (figure* 4, plate XXXII A). 



Formation and localities. The typical specimens occur in the higher cherty 

 beds of the Upper Helderberg limestone at James ville in Ontario county. The 

 species also occurs to the south of Columbia in Herkimer county, and at 

 Eastman's quarry in the south part of Oneida county ; and is abundant in the 

 limestone at Clarence Hollow in Erie county, N. Y. 



Coleolus? Mohri, n. sp. 



PLATE XXXII A, FIG. 5. 



Form cylindro-conical, elongated, curved and very gradually attenuate from the 



larger extremity. 

 Surface transversely striated. 



The length of the fragment under examination, which is curved and imperfect 

 at both extremities, is about three and a half inches. Diameter at the larger 

 extremity about half an inch, and at the smaller extremity one-quarter of an 

 inch. The shell has been comparatively thick, and is converted into crystalline, 

 calcareous matter. 



The surface has been marked by somewhat regular transverse stria), which, 

 as preserved in the impression of the exterior, have been sometimes crowded 

 into fascicles of unequal strength. In the impression of one side of the shell, 

 there is no evidence of an interruption of the striae, or of any longitudinal striae. 



This tubular fossil is referred to the genus Coleolus with much hesitation, 



