244 
GASTEROPODA OP THE INFERIOR OOLITE. 
181. PsEUDOMELANiA SIMPLEX, MoTTis and Lijcett, 1851. Plate XIX, fig. 4. 
1851. Chemnitzia simplex, Morris and Lycett. Great Ool. Moll., p. 49, pi. vii, 
fig. 15. 
Bibliography, ^c. — The authors observe “ that the fine example figured is from 
the hard weathers tone of Bisley Common,” i. e. presumably from the Great 
Oolite. Yet in the Jermyn Street Museum, where Morris and Lycett’s types are 
kept, there is no specimen from the Great Oolite, although there is one large 
specimen placed with the Inferior Oolite Collection. At present, therefore, I am 
without any direct evidence that Ps. simplex occurs in the Great Oolite. 
Description. — Since nearly all the specimens seen by me have suffered from 
compression, no dimensions are given. Large specimens attain a length of 
nearly 200 mm. The shell is turrited in the anterior whorls ; the whorls are 
smooth, and, except those near the apex, are convex, almost globose, with deeply 
impressed sutures ; aperture oval and oblique, with a considerable columellar 
callus. 
Relations and Distribution. — The considerable convexity of the anterior whorls 
seems to separate this species from all varieties of the lineata-procera group. 
The aperture also is more oval, showing less of the posterior angle. It is rarely 
found except as a megalomorph, and is by no means uncommon in the Oolite 
Marl at Notgrove Station. The exact locality of the specimen figured is 
unknown, but it is possibly from the Upper Pisolite of the Nailsworth district. 
A fragment of a Pseudomelania from the “ Oolite Marl,” Nailsworth, is figured 
(PI. XIX, fig. 16). Spiral angle, 25°; height of body- whorl to entire shell, 
45 : 100; length, 16 mm. The whorls are elongate, being nearly as wide as high, i 
smooth, convex, clearly separated by a suture, which has no canaliculation or 
ledge. Body-whorl slightly ventricose, aperture ovate-elongate. This might 
possibly represent an immature stage of Ps. simplex, but is more likely to 
belong to the “ Bulimoid ” group of Pseudomelania. 
182. Pseudomelania l.evigata, Morris and Lycett, 1851. Plate XXI, fig. 6. j 
1851. Eulima L.3EVIGATA, Morris and Lycett. Great Ool. Moll., p. 114, pi. xv, i 
fig. 4. ' 
1882. — — — Hudleston, Geol. Mag., dec. 2, | 
vol. ix, p. 245, pi. vi, figs. 7 ^ 
and ? 8. 
cf. also 1863. Evlima ? l.2EVigata, Lyc. Suppl., p. 13, pi. xxxi, fig. 3. ' 
