488 GASTEROPODA OF THE INFERIOR OOLITE. 
each successive whorl. The body-whorl occupies one third of the total height, 
and is somewhat bicarinate. All the whorls, including the body-whorl, are 
slightly convex and very smooth. The aperture is quadrate, with a short thick 
columella, and wide anterior notch. A fold on the inner and outer walls of each 
whorl. 
Relations and Distribution.—This species belongs to the biplicate section of 
Nerinella (see p. 198, and Pl. XIII, figs. 1 and 2, of this Monograph). It is much 
broader than either of the two unnamed forms there described. Consequently the 
shape of the whorl in section is much more squat. 
There are two specimens in my Collection from the Lincolnshire Limestone of 
Weldon, and others which seem to connect with the narrower forms. 
447, Nermvma (Pryematis) cf. cr1ncenpa, Phillips. Plate XLIV, figs. 8, 8a, 8d. 
Specimens of an elongate Nerinza, not unlike N. cingenda, occur somewhat 
plentifully in the Lincolnshire Limestone at Stoke Lodge. In this case the 
internal section is that of a Ptygmatis with five folds. The specimens greatly 
resemble a variety provisionally named “ pseudocingenda” (see p. 212, Pl. XIV, 
fig. 15, of this Monograph). Bearing in mind that sections of Dogger specimens 
of Nerinea cingenda are liable to mislead, the Stoke Lodge fossils may possibly 
represent the true internal structure of this species. 
Genus—Patupina, Lamarck, 1812. 
Shell turbinated with vound whorls, thin; aperture circular, slightly angular 
behind, peristome continuous, entire ; operculum horny, concentric. 
Conchologists have expressed a doubt whether Paludina extends as far back 
as the Jurassic. Yet Paludina occurs abundantly in the Upper Purbecks. 
Neither can we doubt that Paludina scotica, Tate (‘ Quart. Journ. Geol. Soe.,’ 
vol. xxix, p. 349, pl. xii, fig. 3), from the Infra-Oxfordian beds of Loch Staffin, 
is correctly referred to that genus. 
448. Patupina LANGTONENSIS, sp. nov. Plate XLIV, figs. la, 10. 
Description : 
Height (full size) 5 : : . 30mm, 
Body-whorl to total height : : 5. 60a: 100: 
Spiral angle . : yiGas 
Shell smooth, turbinate, often rather ane in ae and with a considerable 
