NAPLES FAUNA IN WESTERN NEW YORK, PART 2 337 



CALLONEMA Hall. I 879 



Callonema filosum sp. nov. 



Plate 18, fig. 5 



Shell small, with spire tapering abruptly from a broad base. Whorls 

 four to five, convex, but the earlier ones are rounder on their exposed sur- 

 faces than the last, which presents an even, slightly rounded slope from 

 suture to base. The shell is broadest across the base, which is depressed 

 or flattened, making a low rounded angle about the periphery. The surface 

 markings consist of regular, sharp, subequal and continuous oblique lines 

 concentric with the aperture. These are elevated, rounded, separated by 

 grooves of less width and are present on all except the earliest whorls. 

 There is no intersecting ornament and no trace of slit band. The specific 

 characters are quite in harmony with the species already ascribed to the 

 ^genus Callonema, though these are from the fauna of the Onondaga lime- 

 stone. Direct comparison may be made with the shell described by Hol- 

 zapfel as Holopella decheni 1 from Martenberg, Westphalia. 



Dimensions. The single specimen observed has a hight and basal 

 diameter of 5 mm. 



Habitat. Genesee province ; Chautauqua subprovince. In the soft 

 shales at Smith's Mills, Chautauqua co. 



diaphorostoma Fischer. 1887 

 Diaphorostoma (Naticopsis) rotundatum sp. nov. 



Plate 19, fig 11-13 



Shell very rotund and highly convex, subspherical ovoid. Spire small, 

 consisting . of three whorls, and so greatly depressed as to be but very 

 slightly raised above the upper plane of the final whorl ; greatly overlapped, 

 probably for fully two thirds their hight. Suture not impressed. Whorls 

 very rapidly expanding both in hight and width. Aperture attaining almost 

 the full hight of the shell. The body whorl is slightly flattened above, 

 slopes rapidly outward and attains its greatest diameter at about one third 



2 Die Goniatitenkalke von Adorf in Waldeck, p. 25, pi. 5, fig. 3. 



