GASTEROPODA. 59 
NeERITOPSIS STRIATA, Plate XI, figs. 13, 13a. 
NV. Testa ovata; spird elata; anfractibus tribus, conveais; anfractu ultimo costis nume- 
rosissimis crebris cincto, costis subundulatis; aperturd ampld, ovata. 
Shell ovate ; spire elevated ; whorls (3) convex ; the last whorl encircled with numerous 
and closely-arranged costa, which slightly undulate ; aperture large and ovate. 
The costz are narrow, but slightly elevated, the interstitial spaces being so narrow as 
to appear like strize; hence, in badly-preserved specimens, the coste can scarcely be dis- 
cerned ; the spire is small, moderately prominent, and has its surface distinctly sculptured 
in good examples: the specimen figured is rather beneath the average size. 
Locality. Minchinhampton Common, where it occurs somewhat rarely in the soft, 
shelly oolite which underlies the planking. 
Neritopsis suLcosa. Plate XI, fig. 12. 
? Nurivta suLcosa, Archiac. 1843. Mém. Soe. Géol. Fr., vol. v, tab. 28, fig. 8. (Non Brocchi.) 
NV. Testa ovati ; spird parvd; anfractibus tribus vel quaternis, converts, sulco lato 
spirali superne instructis; anfractu ultimo permagno, cingulis inequalibus, numerosis, 
et magnis ornato, 
Shell ovate; spire small; whorls (3 or 4) convex, with a wide, encircling sulcus upon 
their upper portions; the last whorl very large, with numerous, unequal, and large 
encircling bands. 
The encircling ribs extend only upon the last volution, their inequality and large size 
give to the surface ‘a rugose aspect; the sulcus upon the upper part of the last whorl is 
without coste ; the specimen figured is of the largest dimensions. 
Locality. Minchinhampton Common, where it occurs somewhat rarely in the shelly 
beds of coarse planking. 
Pinzouus, G. B. Sowerby, 1823. 
“Shell conical, with a subcentral upright vertex; base concave, with a thin margin 
and tumid centre ; aperture small, within the margin of the base, sublateral, semilunar, its 
outer lip prominent, the inner one crenulated ; spire internal, very short.” —Sowerdy. 
