458 GASTEROPODA OF THE INFERIOR OOLITE. 



i^amt7?/— CALYPTR^ID^. 



" Shell llm'pet-lilce, with the apex more or less spiral ; interior simple or divided 

 hy a shelly in-ocess, variously shaped, to which the adductor muscles are attached.^^ — 

 S. P. Woodward. 



Genus — Capulus, Montfort, 1810. 



^' Sliell conical, apex posterior, spirally recurved: aperture rounded ; muscular 

 impression horseshoe-shaped." — S. P. Woodwaed. 



Since Cajndns dates from Paleozoic times, we need not be surprised at finding 

 it in beds of Jurassic age. The two following species are somewhat more oval 

 than is usual in this genus. 



402. Capulus eugosus, Sowerly, 1816. Plate XLII, figs. \ a,ll),2a,2h. 



181G. Patella, eugosa, Sowerhy. Miu. Conch., pi. cxxxix, fig. 6. 



1851. _ _ _ Morris and Lycett, Gt. Ool. Moll., pt. 1, 



p. 89, pi. xii, figs. 1 a — \e (non fig. If). 

 1885. Patella (Helcion) eugosa, Sowerhy. Cossmaun, Etage Bathonien, 



p. 349, pi. xii, figs. 1—5. 

 1894. Capulus eugosus, Sowerhy. Bohm, jS'eues Jahrbucb, 1894, Bd. i, p. 201. 

 Syn. or var. Patella Tessonii, Deslonycliamjis. Mem. Soc. Linn. Norm., vol. vii, 



p. 113, pi: vii, figs. 3 and 4. 



Bibliography, c^'c. — Patella rugosa was originally described by Sowerby from 

 the Great Oolite of Minchinhampton, where it is extremely abundant, but for the 

 most part much worn, like many of the Minchinhampton shells. Hence the slight 

 spiral apex is in no case preserved in the Minchinhampton fossils. The species is 

 very much rarer in the Inferior Oolite, yet specimens from the Lincolnshire 

 Limestone, such as the one figured, do occasionally exhibit the capuliform apex 

 Such specimens had been in my Collection for some years, when Herr Bohm 

 (op. cit.) was able to demonstrate that P. rugosa is in reality a species of Capulus. 

 Description. — The figured, specimen has the following dimensions : 



Length . . . .44 mm. 



Width , . . . .34 mm. 



Height . , . . .12 mm. 



