454 GASTEROPODA OF THE INFERIOR OOLITE. 



396. RiMULA CLATHRATA, Soivevbij, 1826. Plate XLI, figs. 15 «, 15 h. 



1826. Emakginula clatheata, Sowerhy. Min. Conch., pi. dxix, fig. 1. 



1851. EiMULA CLATHRATA, Sowerbi/. Morris and Lycett, Gt. Ool. Moll., pt. i, p. 86, 



pi. viii, fig. 1. 

 1854. _ _ _ Morris, Cat., p. 276, from G. O. only. 



1885. — — — Cossmann, Etage Bathonien, p. 3i2, pi. vi, 



figs. 31—33. 



Bibliography , ^c. — Essentially a Great Oolite species, tbe type being from 

 Ancliff, rare at Mincliinliampton ; stated by Cossmann to be tolerably abundant 

 at Epernay. Quoted by Lycett from the Inferior Oolite, Leckhampton. I have 

 not seen satisfactory specimens myself from that locality. On the other hand, the 

 Lincolnshire Limestone, which contains so many Bathonian forms, has yielded 

 quite a series of fossils at Stoke Lodge, which may fairly be ranked under 

 B. dathrata, though somewhat more angular in outline than the Ancliff shells. 

 Description (Inf. Ool. variety) 



Length of base " 



Width 



Height j [ . . 5 mm. 



Shell capuliform with a perfectly oval base and curved apex, which projects 

 considerably beyond the posterior margin. The convex dorsal area is somewhat 

 flattened on each side of the very conspicuous midrib, which is separated from the 

 ribs of either flank by a considerable space. From eight to ten strong longitu- 

 dinal ribs on each side ornament the surface, and these are strongly decussated by 

 transverse ribs producing nodes at the points of intersection : subsidiary longi- 

 tudinal ribs may also be noted. The midrib is thick, and the lower edge of the 

 perforation at a considerable distance from the anterior margin. 



Relations and Distribution. — The size, the somewhat rounded back, and 

 especially the regularly nodose ornamentation, may serve to distinguish this from 

 any other species of Bimula in the Inferior Oolite. My specimens are all from 

 Stoke Lodge. 



r . .6 mm. 



approximate I . . 4*5 mm. 



397. RiMULA RUGOSA, sp. uov. Plate XLI, figs. 16 a, 16 b. 



Descrijjtion : 



Length 



Width 



Height 



4 mm. 



approximate -! ... 2"5 mm. 



[ ... 275 mm. 



Shell small, conical, elevated ; base oval, apex strongly curved posteriorly, 

 sides compressed. The midrib and the two diverging lateral ribs on the anterior 



