164 GASTEROPODA OF THE INFERIOR OOLITE. 
88. CERITHIUM LATISULCATUM, sp. nov. Plate IX, fig. 12. 
Description : 
Length : : : «2mm: 
Width : . 3°75 mm. 
Length of body-whorl to entire aha 2 281100: 
Spiral angle about : = 205 
Shell elongate, subconical, turrited ; anes 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 costee, 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, C. limeforme, 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 limxforme-group, though we can scarcely regard 
C. latisulcatum as belonging to that group. 
Rare in the Lincolnshire Limestone at Weldon and Wackerly. 
89. CrRITHIUM PISOLITICUM, sp. nov. Plate IX, figs. 13 a, 13 4. 
Description : 
Length . : : . 8mm. 
Width : 5 : 2) al: Zoom 
Spiral angle (about) : oe ho? 
Shell small, slender, turrited ; spiral atialo 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 
