DOLIUM. 



MOLLUSCA. 



51 



internally striate, the stri<E terminating a little way from the 

 edge ; beak straight, short, truncated, and expanded into a 

 wide canal in front. 

 Found at Plumsted. 



13. B. PROi'iNQUUM — The Kindred Buccinum, pi. XXXII. 

 fig. 31, 32. 



Buccinum propinquum. Sowerby, Min. Conch. V. p. 121, 

 pi. 477, fig. 2. Fleming, Brit. An. p. 345. 



Shell oblong-ovate, acute, with six rapidly decreasing 

 deeply divided volutions, ending in a sharp apex, covered 

 with numerous strong longitudinal ribs, and crossed by many 

 transverse deep sulci, giving the whole surface a tuberculated 

 appearance ; the upper sulci very broad, producing a sub- 

 coronated aspect on the upper margin of the volutions ; 

 aperture nearly circular ; columella smooth, and broadly 

 reflected in the front above, and narrowed below ; outer lip 

 even on the edge ; length six-eighths of an inch ; breadth 

 more than three-eighths. 



Found in the Suffolk Crag. 



14. B. Leathesii. — Loathes' Buccinum, pi. XXXII. 

 fig. 28. 



Buccinum sulcatum. Sowerbj-, Min. Conch. V. p. 122, 

 pi. 477, fig. 4. 



Shell oblong-ovate, consisting of five, slightly defined, 

 nearly flat volutions, terminating in an obtuse apex ; covered 

 with strong, wide-set, transverse, striae ; aperture elongated, 

 somewhat narrowed above ; outer lip plain on the margin, 

 and toothed internally ; length six-eighths of an inch ; breadth 

 not three-eighths. 



Found in the Suffolk Crag. 



15. B. LABiosuM. — The Gross-lipped Buccinum, pl.XXXII. 

 fig. 37, 38. 



Buccinum labiosum. Sowerby, Min. Conch. V. p. 122. 

 pi. 477, fig. 3. Fleming, Brit. An. p. 345. 



Shell oblong-ovate, consisting of seven volutions ; spire 

 tapering rapidly, and terminating in an acute apex ; sides of 

 the volutions somewhat flattened, and slightly separated ; 

 covered with fine transverse sulci, from ten to twelve on 

 each volution, in some instances more ; aperture oblong- 

 ovate, slightly narrowed above ; pillar lip broadly reflected 

 on the columella above, and contracting as it descends : outer 

 lip smooth and thin ; length six-eighths of an inch. 



Found in the Suffolk Crag. 



16. B. ELEGANs, — The Elegant Buccinum, pi. XXXII. 

 fig. 35, 36. 



Buccinum elegans. Sowerby, Min. Conch. V. p. 121, 

 pi. 477, fig. 1. 



Shell subconic, acuminated, consisting of seven ventricose, 

 deeply defined volutions, and terminating in an acute apex ; 

 with longitudinal, rounded, prominent ribs, and crossed by nine 

 or ten sharp, distant, elevated strise ; aperture slightly ovate ; 

 jiillar lip smooth ; outer lip toothed within. 



Found in the Suffolk Crag. 



17- B. spiNosuM. — The Spined Buccinum, pi. XXXII. 

 fig. 24, 25. 



Buccinum spinosum. Sowerby, Min. Conch. \'. p. 128, 

 pi. 566, fig. 3, 6. 



Shell conical, elongated, subturreted ; each volution 

 invested by a sharp spiral furrow, above which is a con- 

 tinuous series of large, blunt, tubercular spines, with a row 

 of smaller ones at the base ; aperture semiovate ; columella 

 smooth ; beak somewhat produced. 



Found in the Carboniferous or Mountain Limestone of 

 Torquay and Newton Bushel, Devonshire. 



18. B. UNiLiNEATUM The One-Lined Buccinum, 



pi. XXXn. fig. 8, 9. 



Buccinum unilinealum. Sowerby, Min. Conch. V. p. 140, 

 pi. 486, fig. 5, 6. 



Shell elongated, consisting of six volutions, with straight 

 sides, and gradually tapering to a rather obtuse apex ; each 

 volution with a single linear furrow close to its upper edge ; 

 body rather ventricose ; the whole covered with very fine 

 spiral strife ; aperture obliquely elongated, narrow, and 

 straitened at both extremities ; beak short ; columella smooth ; 

 outer lip tiiin ; length not three-eighths of an inch ; breadth 

 half its length. 



Found in the Limestone at Ancliff. 



19. B. PARALLELE — The Parallel Buccinum, pi. XXXII. 

 fig. 30. 



Buccinum parallele. Phillips, Geo. of York. II. p. 229, 

 pi. 16, fig. 8. 



Volutions slightly inflated, and well defined by the suture, 

 spirally striated, their upper portions plane, the lower por- 

 tions convex with many equal spiral furrows. 



Found in the Mountain Limestone at Bolland, Queen's 

 County, Ireland. 



Genus X.U.—V>OlA\}U.—D'Argenville. 



Shell suboval, extremely ventricose, thin, sometimes 

 subglobose, frequently transversely costated, or sul- 

 cated ; spire short ; aperture very large, provided with a 

 short reflected canal ; outer lip generally thin, in some 

 instances a little thickened, reflected and crenated at 

 the margin ; external surface generally covered with a 

 thin, horny epidermis. 



1. D. NODOSUM. — The Nodulous Doliuni, pi. XXXIII. 

 fig. 9, 10. 



Dolium nodosum. Sowerby, Min. Conch. \. p. 34, 

 pi. 426 and 427. A cast of a species of Dolium, Mantell, 

 Geo. Sussex, p. 196. 



Shell ovate, ventricose ; spire depressed, consisting of three 

 volutions, and having spiral-rounded belts, crossed by a few 

 wide-set, longitudinal strice, ending in a flattened apex ; 

 whole shell provided with numerous transverse rows of large 

 and somewhat flattened knobs, with intervening sulci. 



Discovered in the Chalk at Clayton Pit. by Kicliard 

 Weeks, Esq. 



Genus XIII.— PURPURA.— yjV(^M/eVe. 



Shell generally ovate or oblong ; spire short, mostly 

 grooved, granose, or tuberculate, or externally spinose ; 

 aperture generally largely dilated and ovate ; margin of 

 the outer lip usually sharp, and frequently tootiied 

 within, near the edge ; emarginate at the base, where it 

 is notched, ami ending in a short canal ; columella gene- 

 rally depressed, often internally acute at the edge, and 

 terminating below in a sharp point ; operculum horny, 

 provided with a lateral nucleus, thinner on the margin 

 next the columella. 



