324 GASTEROPODA OF THE INFERIOR OOLITE. 
The ornaments are somewhat similar to those of 8S. pisoliticwm, but the 
proportions differ considerably, as this is a truly conical shell. It occurs in the 
Freestones of Leckhampton, and seems to be very rare. 
258. SoLarIUM SUBVARICOSUM, sp. nov. Plate XXVI, figs. 11, 12. 
Description : 
Diameter (large size) . : 2 . 13mm. 
Height ‘ : 5 . 10mm. 
Spiral angle . : pom 
Shell conical, moderately depressed, deaply but not widely umbilicated. The 
form is that of a true cone with a somewhat flattened apex; nucleus oblique. 
Number of whorls six, increasing under a regular angle, and rather concave; 
sutures distinct. The upper margin of each whorl has a circlet of fine, closely- 
set granulations, whilst the corresponding ornament at the base of each whorl 
consists of a circlet of stout tuberculations set widely apart. The interspaces are 
markedly rugose ; axial lines inclined from left to right, and decussated by very. 
fine spirals. 
The body-whorl occupies somewhat more than half the height of the shell, 
and is markedly concave, with a blunt carinated margin studded with broad 
tubercles ; the base is nearly flat, being only slightly raised towards the edge of 
the umbilicus, where the ends of the curved axial wrinkles are gathered into a 
ring of tubercles. The base is decussated throughout by a system of fine spiral 
and growth lines. Aperture subquadrate or trapezoidal. 
Relations and Distribution.—This very typical species of Solariwm is obviously 
related to S. varicosum, Morris and Lycett. It differs from the Great Oolite 
species inasmuch as the whorls are concave rather than angular. The umbilicus 
also in the Inferior Oolite shell is larger and more tuberculated at the margin, 
and the base less flat. It is also closely related to Solariwm formosum, Terq. and 
Jourd., and to 9. serpentinwm, Terq. and Jourd., both from the Bathonian of 
Les Clapes. The Inferior Oolite species is less depressed. 
The smaller specimen (fig. 11) is from the Parkinsoni-zone of Aston cutting ; 
the larger specimen (fig. 12) probably from the Inferior Oolite of the Yeovil 
district, but the exact locality is doubtful. Six specimens are known to me. 
Those from the Parkinsoni-zone of Aston cutting differ somewhat from the 
shells of the Dorset-Somerset district. 
