364 GASTEROPODA OF THE INFERIOR OOLITE. 
299. DetpuinuLa (Turso) Bucxmanni, Morris and Lycett, 1851, Inferior Oolite 
variety. Plate XXX, fig. 11. 
1851. Denpainuta Buckmannt, Morris and Lycett. Great Ool. Moll., pt. 1, 
p. 71, pl. v, fig. 8. 
1884. Turso Buckmannt, Morris and Lycett. Cossmann, Etage Bath., p. 265, 
pl. vii, fig. 50. 
Bibliography, §c.—The authors speak of D. Buckmanni as occurring in the beds 
of coarse planking on Minchinhampton Common, though it must be rare, as I have 
never seen any specimens from the Great Oolite except the three in the Jermyn 
Street Museum, one of which is the type. In none of these are there strong indica- 
tions of an umbilicus. Quoted by Cossmann from two localities in the Bathonian 
of France. 
Specimens from the Inferior Oolite show a considerable umbilicus. The 
following relates exclusively to Inferior Oolite specimens, which may possibly 
represent a distinct species. 
Description : 
Height : ; : ; 2 10mm: 
Width ; : : : = Lismm: 
Spiral angle . ; : 5 lle 
Shell turbinate, moderately thick, more or less umbilicated ; the spire, which is 
pointed and conical, occupies about two-fifths of the total height. Number of 
whorls five; the two apical ones smooth, the next two are carinated anteriorly, 
and ornamented with a pair of tuberculated spirals, the points of which are joined 
by thick radial costz ; sutures moderately wide. 
The body-whorl is large, angular, and bicarinate; base full. The primary 
ornaments consist of a tuberculated spiral on the posterior margin, and one on 
each of the carine, these being decussated by a system of thick radial costa, which 
extend from the posterior margin of the whorls across the intercarinal hollow, and 
right across the base to the margin of the funnel-shaped umbilicus; fine spiral 
strize, especially conspicuous in the intercarinal hollow, constitute a secondary 
ornamentation. The aperture is circular, with but little callus on the inner lip. 
The radial costs are sometimes continued over the margin of the umbilicus, which 
varies as to size, being much encroached upon in some of the older shells. 
Relations and Distribution.—If this is really the same as the Great Oolite 
species, the range of D. Buckmanni is considerable. In the Inferior Oolite it has 
only been found, so far as I know, in the Oolite-Marl of the Nailsworth district, 
whence specimens are occasionally obtained. 
