﻿SCOLIOSTOMA. 233 



and it appears to me that this is the shape it would assume if the true mouth were 

 absent. 



2. Scoliostoma gracflb, Sandberger (?). PI. XXIII, figs. 10, 10 a. 



? 1853. Scoliostoma geacile, Sandberger. Verst. Ehein. Nassau, p. 225, pi. xxvi, 



figs. 5, 5 a. 

 1889. — Whidborne. Geol. Mag., dec. 3, vol. vi, p. 30. 



Description. — Shell small, very elongate, turriculated, many-whorled. Spire 

 of more than ten whorls, conical below, but becoming almost cylindrical towards 

 the apex. Suture apparently rather deep. Whorls narrow, about half their 

 diameter in height, but increasing in height with their proximity to the apex; 

 moderately convex, the convexity slightly increasing in the lower part of the 

 whorl ; slightly angulated along the median line. Ornamentation mammillar, 

 consisting apparently of small rounded tubercles arranged in six spiral rows, the 

 first of which is immediately below the suture, and seems more continuous than 

 the rest. Body-whorl uniform with the whorls above, and turning in suddenly to 

 form an almost flat base. Umbilicus minute and deep. Columella or inner lip 

 rounded, thickened, and expanded. 



Size. — Height of a specimen retaining the ten lower whorls 19 mm., width 

 7 mm. 



Locality. — Wolborough. A single example is in the Battersby Collection in 

 the Torquay Museum. 



Remarks. — The specimen from which the above description is taken has its 

 surface very much worn and blurred, after the characteristic manner of so many 

 of the Wolborough shells, so that it is impossible to decipher the ornamentation 

 with any degree of certainty. Its mouth, also, is a good deal injured and 

 obscured by the matrix, but it would seem to have been of a more or less rounded 

 and expanded form, with a thickened peristome. The top of the spire is so nearly 

 cylindrical as probably to indicate that several upper whorls are absent, but it 

 becomes more conical downwards, and in consequence of this the comparative 

 narrowness of the whorls increases with their distance from the apex. 



A comparison of this specimen with the figure of Scoliostoma gracile, Sand- 

 berger, leads me to the conclusion, in which Mr. Roberts supports me, that, as 

 far as the present evidence goes, they are probably to be referred to the same species. 

 There are certainly some differences between them, especially in the greater 

 narrowness of the whorls of the German shell and in its more conical form, but 



