478 GASTEROPODA OF THE INFERIOR OOLITE. 
Genus—Cy.inprites, Morris and Lycett, 1851. 
* Shell smooth, sub-cylindrical, or ovate; spire small ; whorls usually flattened, 
with acute margins, the last whorl cylindrical, aperture lengthened, linear above, rounded 
and entire at the base ; columella rounded, twisted near to the base and slightly directed 
outwards ; vight lip thin, but thicker at the base.’”’—Morris anv Lycert. 
This is chiefly a genus of the Great Oolite; the number of species in the 
Inferior Oolite is limited, and their distribution very partial. Considerable 
difficulty arises from the uncertain evidence with regard to the identification of 
Lycett’s species from the Inferior Oolite of Gloucestershire. On the whole the 
species of Cylindrites may stand thus: 
Turrited . : : . Cy. turriculatus, Lycett. 
é oer Cy. attenuatus, Lycett. 
Spire consisting of a low cone c { ne D Si 
Cy. brevispira, sp. nov. 
Cy. tabulatus, Lycett. 
— var. Weldonis. 
* LOy. mammillaris, Lycett. 
Spire flat or subdepressed, with a mam- [ 
millary knob 
Spire sunken c : . Cy. cylindricus, Morris and Lycett. 
428, CYLINDRITES TURRICULATUS, Lycett, 1853. Plate XLIII, fig. 12. 
1853. CyLINDRITES TURRICULATUS, Lycett. Quart. Journ. Geol. Soc., vol. ix, 
p. 342, pl. xiv, fig. 8. 
1863. _ —_ _ Great Ool. Moll., Suppl., p. 25, 
pl. xliv, fig. 26. 
Description. —* Shell elongated, subcylindrical; spire lengthened, its apex 
acute; whorls convex, their sutures deeply excavated, the last whorl ovately 
cylindrical; aperture narrow.” Lycett’s type is not available, nor have I seen a 
specimen so large as the one figured by him. My specimen (fig. 12) has a spiral 
angle of 60°, and no more than six whorls; the spire is nearly one third of the 
total height. 
Relations and Distribution.—Probably only a small variety of Cylindrites altus, 
Morris and Lycett, from the Great Oolite, but less cylindrical, and with the 
posterior edge of the whorls less flattened. Rare in the Lincolnshire Limestone 
at Ponton and Weldon, it is the only species of Cylindrites from the Inferior 
Oolite which has a well-developed spire. 
