MOLLUSCA. 



Sowerby, Min. Conch. I. p. 17, pi. 4. 

 331. 



46 



Cyprcea oinformis. 

 Fleming, Brit. An. p. 



Shell ovifoi-ra, tumid, smooth, shining, and slightly mar- 

 ginate ; most inflated at about a third of its length from the 

 apical end, and afterwards tapering slightly to a short, rather 

 broad, canaliculate beak; spire small, concealed; aperture 

 longitudinal, narrow at the broadest extremity, widening 

 considerably towards the beak, and dentated ou both of the 

 inflected lips. 



Found in the London Clay at Highgate Hill. 



2. C. AVELLANA. — The Filbert Cypraaa, pi. XXX. 



fig. 36, 37. 



Cypraa avellana. Sowerby, Min. Conch. IV. p. 107, 

 pi. 378, fig. 3. Fleming, Brit. An. p. 331. 



Shell obovate, or neai-ly spheroidal, with strong, numerous, 

 wide-set, elevated transverse striae, extending from the 

 inflected margin of one lip to that of the other, and only 

 partially interrupted by a shallow longitudinal groove ; aper- 

 ture contracted and somewhat curved at both extremities. 



The strias are sometimes longer and shorter, terminating 

 before they reach the inner margins of the lips, and the inter- 

 vening spaces are flattened. 



Found in the Sufiblk Crag, by the Rev. G. R. Leathes. 



3. C. cocciNELLOiDES. — The Coccinella Cyprsea, pi. XXX. 

 fig. 28, 29. 



Cyyrwa coccinelloides. Sowerby, Min. Conch. IV. p. 107, 

 pi. 378, fig. 1. Fleming, Brit. An. p. 331. 



Shell ovate, somewhat spheroidal, with numerous acute 

 transverse stri.e ; aperture slightly arcuated, and not con- 

 tracted in the centre ; outer lip convex. 



Found in the Suffolk Crag. 



4. C. RETUSA.— The Blunted Cyprsea, pi. XXX. fig. 38, 39. 

 CyprcBa retusa. Sowerby, Min. Conch. IV. fig. 107, 



pi. 378, fig. 2. Fleming, Brit. An. p. 331. 



Shell obovate, subspliEeroidal, with somewhat distant, ele- 

 vated strias ; aperture slightly curved at its narrow extremity. 



This species will at once be distinguished from the C. 

 coccinelloides by its few and remote striae, and its nearly 

 spherical form. 



Found in the Sufiblk Crag. 



Genus \1. — 0\\]'LA. — Briiguiere. 



Shell turgid, attenuated at both extremities ; margins 

 convolute ; aperture longitudinal, narrow at its upper 

 part, and generally more widened below ; effuse at both 

 ends ; the left margin destitute of teeth. 



1. O. Leathesi. — Leathes's Ovula, pi. XXX. fig. 32, 33. 



Ovtila Leathesi. Sowerby, Min. Conch. V. p. 124, pi. 478. 

 Calpurna Leathesi. Fleming, Brit. An. p. 331. 



Shell smooth, eliptical, elongated, ventricose in the centre, 

 and tapering and contracted to each extremity ; columella 

 with a large plait, and with a thick testaceous glazing; outer 

 lip very thick and smooth ; opposed to the lower part of 

 the lip the bodj' is somewhat flattened. 



Found in the Crag at Walton, by the Rev. G. R. Leathes. 



VoLCTA. 



Family II.— COLUMELLARIA. 



Destitute of a canal at the base of the aperture, but 

 having a subdorsal more or less distinct notch, with folds 

 or plaits on the columella. 



Genus VII.— VOLVARIA.— Za?«a/-c^. 



Shell cylindrical, convolute ; the spire hardly pro- 

 truding above the body, and appearing as if forced into 

 the superior part of the shell, where it terminates in an 

 obtuse salient point ; aperture narrow, extending nearly 

 the whole length of the shell, somewhat wider below 

 than above, and truncate at the base ; columella with 

 three or four oblique folds at the base. 



1. V. acutiuscula The Acute Volvaria, pi. XXX. 



fig. 30, 31. 



Volvaria acutiuscula. Sowerby, Gen. of Shells, Gen. 

 Volvaria, fig. 3. Min. Conch. V. p. 142, pi. 487. Fleming, 

 Brit. An. p. 333. 



Shell almost cylindrical, slightly contracted towards both 

 ends ; spire concealed, crossed by numerous, transverse, 

 square-punctured striae ; plaits upon the columella variable in 

 number and dimensions, generally four or five ; aperture 

 widened at both extremities, and somewhat straitened in 

 the centre ; outer lip a little thickened, and projecting above 

 the apes, and giving the spire the appearance of being con- 

 cealed within a small pit. 



Found in the London Clay at Barton Cliff. 



Genus V III.— WOl.\JT \.—LinncEus. 



Shell ovate, more or less ventricose ; apex papillose : 

 destitute of a canal ; emarginate or notched at the base ; 

 columella plicated, the lower folds larger and more 

 oblique than the others ; destitute of a columellar 

 laminae. 



SECTION I. — papilla LARGE, SMOOTH, AND CORONATED. 



1. V. LucTATOR. — The Wrestler Volute, pi. XXXI. 

 fig. 9. 10. 



Voliitn Liictafor. Sowerby, Min. Conch. II. p. 29, pi. 115, 

 fig. I. Fleming, Brit. An. p. 332. Valuta musicalis. Lamarck, 

 Env. de Paris, p. 26. Stromhus luctator. Brander, Hant. 

 fig. 64. 



Shell acutely ovate : spire short, conical, with the volutions 

 concealed above ; crowned with tubercular spines, which 

 diminish rapidly as they ascend ; body with longitudinal ribs, 

 corresponding in number to the tubercles ; these terminate at 

 the base, where they become indistinct ; the whole are crossed 

 by numerous transverse, somewhat undulous, linear, sulci ; 

 deepest towards the base ; the whole body and spire covered 



