86 MOLLUSCA FROM THE GREAT OOLITE. 
Locality. This little conical shell ranks with the rarest productions of the Great 
Oolite ; the white stone of Eastcombs and Bussage have furnished the only known English 
specimens: Langrune, France. 
Rimvna, Defrance, 1827. 
Rimvtaria, Defrance. 1827. 
Steno, Brown. 1847. 
Shell conical, base entirely open, oval; apex curved more or less posteriorly ; surface 
near the anterior border with a fissure, or oval foramen, usually placed upon a prominent 
longitudinal rib; the fissure does not reach the margin. 
RIMULA TRICARINATA, Sow., sp. Plate VIII, fig. 2, 2a—c. 
EMARGINULA TRICABINATA, Sow. 1826. Min. Con., t. 519, fig. 2. 
— Brown. 1847.  Illust. Foss. Conch., p. 104, t. xlviii, 
figs. 14, 14*. 
—_— — Bronn. 1848. Index Paleont., p. 457. 
— _— D’ Orb. 1850. Prod. Paléont., p. 303. 
R. Testa parvd, conicd ; apice postice curvato, costis tribus magnis anticis, aliis minoribus 
posticis, lineis interstitialibus, transversis numerosis. 
Shell small, conical ; apex curved posteriorly, with three large diverging, anterior ribs ; 
other smaller ribs occupy the sides and posterior part of the shell; the interstitial spaces 
have numerous tranverse lines. 
In this species, as in the 2. Blotiz, the fissure is of a lengthened oval figure, and is cut 
out of the middle and more elevated rib. Having examined the original specimen figured 
in the Mineral Conchology, we are enabled to assign it to the present genus without 
hesitation; in two of the specimens on the same tablet, an imperfection at the anterior 
extremity of the mesial rib gave them somewhat the aspect of an Hmarginula, and may have 
been the reason, probably, for assigning both this and &. clathrata with that genus. 
Locality. Ancliff: two specimens have, likewise, been found at Minchinhampton. 
RimvuLa cLaTHRatA, Sow., sp. Plate VIII, fig. 1, la—e. 
EMARGINULA CLATHRATA, Sow. 1826. Min. Con., t. 519, fig. 1. 
? — Gotprussit, Roémer. 1836. Nordd. Oolith., t. 19, fig. 23. 
? —_ — Goldfuss. 1845. Petref., t. 167, fig. 15. 
StpHo cLaTHRatA, Brown. 1847.  Illust. Foss. Conch., p. 103, t. 48, figs. 1, 2. 
Rimuta = — Morris. 1843. Catalogue of British Fossils, p. 160. 
— a Bronn. 1848. Index Paleont., p. 1088. 
_ - D’ Orb. 1849. Prod. Paléont., p. 303. 
