164 GASTEROPODA OF THE INFERIOR OOLITE. 



88. Cerithium latisdlcatum, sp. nov. Plate IX, fig. 12. 



Description : 



Length . . . .11 mm. 



Width .... 375 mm. 



Length of body- whorl to entire shell . 28 : 100. 



Spiral angle about . . . 20°. 



Shell elongate, subcorneal, turrited ; spiral angle moderately convex. Number 

 of whorls ten to twelve, flat, subangular, and separated by a wide suture. In the 

 subapical whorls the tubercles coalesce so as to produce short axial costse, which 

 preponderate over the obscure spiral lines. In the anterior whorls four spirals 

 are distinguished, of which the two uppermost are the most strongly tuberculated, 

 the third is faint, and the fourth spiral is so prominent as to impart an angular 

 shape to the whorls of the spire. 



The body-whorl is barely one-third the entire length of the shell, and in 

 shape and ornament similar to the whorls of the spire. Base rather full and 

 finely striated. Aperture nearly quadrate, with a deep anterior canal. 



Relations and Distribution. — Distinguished from C. Beanii, G. limgeforme, and 

 their numerous varieties by the less curved spiral angle, by the great width of 

 suture, by the angular shape of the whorls, and by the relative shortness of the 

 body- whorl. In the matter of ornamentation, however, there is a certain general 

 resemblance to the shells of the limseforme-grouip, though we can scarcely regard 

 C. latisulcatum as belonging to that group. 



Rare in the Lincolnshire Limestone at Weldon and Wackerly. 



89. Cerithium pisoliticum, sp. nov. Plate IX, figs. 13 a, 13 b. 



Description : 



Length . . . .8 mm. 



Width .... 175 mm. 



Spiral angle (about) . . .10°. 



Shell small, slender, turrited ; spiral angle nearly regular, apex but slightly 

 obtuse. Number of whorls about twelve ; apical whorls smooth ; third whorl 

 slightly costated ; subapical whorls flat, not very closely defined by the suture, and 

 ornamented by three granular spirals. The anterior whorls are turrited, and the 

 spirals are four or five in number, and each row is studded with a series of circular 

 tubercles, which are largest on the upper row. A slight failure in the third spiral 



