456 GASTEROPODA OF THE INFERIOR OOLITE. 



which the middle one is the most prominent ; there are also slight traces of 

 smaller costee upon the flattened sides of the shell ; the height exceeds the length 

 of the aperture ; rare." 



This diagnosis agrees with the specimen in the Jermyn Street Museum, 

 although, according to my measurements, the height does not quite equal the 

 length of the base. 



Relations and Distribution, — The relative height and compression may serve to 

 distinguish this from any other species of Biinala, though it is evidently related 

 to the species erroneously identified by Morris and Lycett (' Great Oolite Moll.,' pt. i, 

 p. 87, pi. viii, fig. 3), with Bimula {Emarginula) i?Zoiu', Deslongchamps. The form 

 figured by Morris and Lycett has been referred with a query to B. Deslongchampsi, 

 Cossmann (' £t. Bath.,' p. 342, pi. xii, figs. 83 — 34). Bimula alta,as, a species, is 

 based on a single good specimen from Leckhampton. 



400. RiMULA ooLiTiOA, sp. uov. Not figured. 



This name I propose for the forms in the Inferior Oolite which several British 

 authors have referred, under the generic title of Bimula, to Emarginula Blotii, 

 Deslongchamps.^ 



Descri'ption. — Shell small, strongly tricarinate, sides much compressed and 

 flattened, and ornamented by seven or eight curved costge of considerable 

 prominence. The two intercarinal grooves are narrow, and show no trace of an 

 intermediate rib. Transverse scalate ornament pervades the shell. Other 

 indications clearly those of a Bimula and not of an Emarginula. 



Belations and Distribution. — Differs from B. tricarinata, Sow., in its narrow, 

 compressed, and elongated form : not so elevated as B. alta, which also possesses 

 somewhat different lateral ornamentation ; resembles the Great Oolite species 



^ Thu8 we find the following identifications : 



1851. EiMTJLA Blotii, Deslongchamps. Morris and Lycett, Gt. Ool. Moll., pt. i, 



p. 87, where it is stated to occur in 



the shelly roestone at Leckhampton. 



1854. — — — Morris, Cat., p. 275, both in G. O. and 



LO. 

 1875, — 'Qlottii {s,\c), Deslongchamps. Judd, Geology of Eutland, p. 282, 



as a fossil of the Inf. Ool. in the 

 Midlands (Etheridge). 

 1892. — Blotii, Beslongchatnps. Hudleston and Wilson, Cat., p. 116, 



both in G. O. and I. 0. This view 

 was based on the identifications of 

 the authors previously quoted. 



