CERITHINELLA. 187 
exhibiting short, thick coste. Beyond this point the ornaments vary considerably 
within certain limits. The upper spiral belt becomes a complex zone made up of 
several spiral lines more or less undulating, which decussate with a system of 
numerous short nodular coste; about three spiral lines without any decussation 
occupy the lower and more constricted portion of the whorl, which is terminated 
by a nodular spiral belt, representing the lower of the two belts in the earlier 
whorls. The above description only applies to very fully developed specimens. 
Body-whorl short, concave, and similarly ornamented; base depressed and 
somewhat excavated, marked with strong spiral lines. Aperture small, sub- 
oblong, and somewhat constricted anteriorly. Anterior angle strongly marked, 
but with scarcely any canal. A slight incrustation of the inner lip. 
Varieties.—With the above I associate provisionally two varieties, one of which 
(fig. 2) occurs in the “ Dew-bed” of Bradford Abbas. The proportions are 
nearly the same, except that the body-whorl is somewhat shorter relatively. The 
shell itself is more turrited and the whorls rather more angular; the ornaments 
also are less rich, the number of spirals especially being fewer. Altogether it is a 
less well-developed variety. I propose to distinguish this as var. drosera. The 
specimen is unique. 
The other variety (fig. 3) is from the neighbourhood of Beaminster, and 
occurs, no doubt, on one of the lower horizons. The whorls are not angular, and 
are separated by a very wide and shallow sutural sulcus. There is no turriting in 
the sense of the succeeding whorls projecting beyond the preceding ones. The 
ornaments are less elaborate ; the short costz in the posterior part of each whorl 
are simpler, and have a decided twist from left to right. The specimen, which is 
unique, exhibits an almost imperceptible fold in the outer lp, as in Nerina. 
This I propose to distinguish as var. melitta. 
Relations and Distribution.—But little more can be said at present on the 
score of affinities. These beautiful shells are very scarce and never perfect. 
Excluding the two varieties already named, the Sowerbyi-bed of North Dorset 
alone has yielded these fossils. 
117. Cerirainetia Bropigi, sp. nov. Plate XII, figs. 4 a, 4 0. 
Description : 
Length about ; : : . 30mm. 
Width 3 ; : : 9 = GSE: 
Spiral angle about P : : Rone (le 
Shell subcylindrical; whorls numerous, angular, varying from subconvex to 
