210 GASTEROPODA OF THE INFERIOR OOLITE. 
more like those of other species from the Inferior Oolite. The number of spirals 
is four. It probably represents apical conditions merely. 
145. Nerina, cf. rLucantuLA, D’Orbigny, 1850. Plate XIV, fig. 12. 
1850. Nurinma evecanruna, D’Orb. Prodrome, i, p. 298. 
1852. — —- — Terr. Jurass, vol. ii, p. 88, pl. celiii, figs. 
5 and 6. 
Description.—Spiral angle about 12°, length 22 mm. The number of whorls 
about fourteen, narrow, flat, and increasing by steps; the posterior margin of each 
whorl is occupied by a prominent belt, the suture lying in the depression imme- 
diately above. In the earlier whorls are two tuberculated spiral lines, the lower 
one being the stronger; these increase in number up to four, the one towards 
the centre having the largest tuberculations. Section triplicate. Rare at Great 
Ponton. 
N.B.—This concludes the list of triplicate Nerinzas. The identification of the 
species from the upper beds of the Lincolnshire Limestone at Weldon and Great 
Ponton is far from satisfactory, and yet the fossils are too imperfect in the majority 
of cases for one to venture on making many new species. ‘The forms clearly have 
Bathonian affinities, and yet are not exactly Bathonian species. The ornaments 
in two or three cases are more of the nature of tuberculations than is usual with 
species in the Inferior Oolite. 
Seorion D (QuapRIPLicaTs). 
146. Nerina cincenpa, Phillips, 1829. Plate XIV, figs. 13 a—f, 14. 
1829 and 1835. TurRRireLta cinGENDA, Sowerby. Phillips, Geol. of Yorksh. 
Coast, p. 164, pl. xi, figs. 28 and 29. 
1836. Nerinma cryeenpa, Phil. Bronn, in Neues Jahrbuch for 1836, p. 558. 
1875. - -— — Geol. of Yorksh. Coast, 3rd edition, p. 258, 
pl. xi, figs. 28 and 29. 
1884. — — — Hudleston, in Geol. Mag., dec. 3, vol. i, p. 110, 
pl. iv, figs. 3 and 4. 
Description.—Since this species exhibits a considerable amount of dimorphism, 
both the proportions and external markings are subject to some variation. 
Spiral angle (subapical) . : aie. 
Pp g 
