﻿296 



GASTEROPODA OF THE INFERIOR OOLITE. 



three nearly equal, equidistant spiral girdles (in the penult usually a subordinate 

 fourth), which are evenly and regularly serrated. The appearance is almost that 

 of a coil of whipcord wound round a top. 



The body- whorl considerably exceeds half the height of the shell ; it is 

 rounded, but not ventricose. There are four principal spiral girdles similar to 

 those already described, and in the base about six spirals similarly ornamented, 

 and of nearly equal prominence, but becoming less salient towards the point of the 

 columella. 



The aperture is subcircular, flattened anteriorly with a straight .pillar lip and 

 large callus, much thickened towards the centre, so as to form a kind of tooth ; 

 outer lip crenulated. 



Relations and Distribution. — The regularity, prominence, and peculiar rope-like 

 character of the spiral ornaments clearly distinguish this from any other species in 

 the Inferior Oolite of England. Laube's species is near to it, but appears more 

 eucycloid in character. 



The figured specimens are both from Bradford Abbas, most probably from the 

 concavus -zone. It occurs also on nearly the same horizon in the neighbourhood 

 of Beaminster and at Stoford. There were three specimens without locality in 

 Dr. Wright's collection. There is also a specimen in a ragstone matrix said to 

 come from Cleeve Hill. Altogether about a dozen specimens are known to me. 



Attention is here drawn to a shell (PI. XXIII, fig. 14) which appears to be an 

 Amberleya rather than a Littorina. The following are the dimensions : — Length 

 20 mm., length of body-whorl to total height 55 : 100, spiral angle 50°. The 

 style of ornamentation is somewhat similar to that of Littorina polytimeta, but the 

 serrations are rather finer, and there are four spirals in the whorls of the spire, 

 and also the spirals in the base are more numerous. In conformity with the shape 

 of the shell the aperture is more elongate, otherwise similar, and with a similar 

 tooth-like thickening. 



This form is rare in the " Base-bed " at Lincoln. 



230. Littorina Phillipsii, Moms and Lycett, 1851. Plate XXIII, fig. 16. 



1851. Turbo Phillipsii, Morr. and Lyc. Great Ool. Moll., p. 117, pi. xv, fig. 12. 

 1884. Littoeina Phillipsii, Morr. and Lyc. Hudleston, Geol. Mag., dec. 3, 



vol. i, p. 242, pi. viii, fig. 1. 



Description : 



Length ..... 12 — 18 mm. 

 Length of body-whorl to total height . 60 : 100. 



Spiral angle .... 68°. 



