NERITOPSIS. 341 
restricted in this country to the Parkinsoni-zone of Burton Bradstock, where it 
occasionally attains a large size. 
273. Nerrrorsis Putters, d’Orbigny, 1850. Inferior Oolite variety, Plate XXVII, 
hess tila, Ios lie: 
1850. Nertropsts Purira, d’Orbigny. Prod., i, p. 247. 
1852. — — — Terr. Jur., vol. ii, p. 222, pl. cece, figs. 5—7. 
Cf. also — Basocensis, d’Orb. Hudleston, Geol. Mag., dec. 3, vol. i, 
p- 800, pl. ix, fig. 11 (Dogger variety). 
The Dogger specimen above referred to was described by me as an intermediate 
form, and it belongs to the variety figured on the accompanying plate (XXVII, 
11), which is the prevailing form in the Concavus-bed at Bradford Abbas, where it 
sometimes attains a width of nearly 40 mm. It has the flattened shoulder and 
spiral ornamentation of Neritopsis Philea, and is devoid of the thick radial costa 
so characteristic of N. Bajocensis. The “rampe postérieur,” however, is scarcely 
developed in this variety, and the ornamentation generally is finer. Occasionally 
a specimen which corresponds almost exactly with d’Orbigny’s figure and 
description may be found in the Concavus-bed. To these the name N. Philea may 
be applied without hesitation. If it is desirable to recognise the variety I would 
suggest Neritopsis Philea, var. Abbas. 
274. Neriropsts varicosa, Morris and Lycett, 1851. Plate XXVIII, figs. 1a, 16, 1c. 
1851. Nerirorsis varicosa, Morris and Lycett. Great Ool. Moll., pt. i, p. 106, 
pl. xi, figs. 20, 20a; pl. xiii, 
fig. 5. 
1854. — — — Morris, Cat., p. 265. 
Description : 
Height of a full-sized specimen 5 . 135 mm. 
Width ‘ ; : . 16°5 mm. 
The following is the diagnosis by the authors :—‘‘ Shell neritiform, ovately 
oblong; varices large, longitudinal (about ten in a volution), more or less elevated, 
decussated, with numerous regular, elevated, and transverse (spiral) lines; the 
lines are impressed with extremely fine and dense perpendicular strie; the 
aperture round.” 
Relations and Distribution.—This species is related to N. Bajocensis, from 
4h 
