48 



MOLLUSCA. 



M 



ITRA, 



* Shells smooth and unarmed. 



9. V. Lambebti.— Lambert's Volute, pi. XXX. fig. 22, 23. 



Voluta Lamberti. Sowerby, Min. Conch. II. p. 65, 

 pi. 129. Voluta of Harwich. Parkinson, Org. Hem. III. 

 p. 26, pi. 5, fig. 13. A Cast. Hist. Lap. Fig. p. 112, pi. 33, 

 fig. 3. Appendix to Dale's Hist, of Harwicli, p. 289, pi. 10, 

 fig. 14. 31itia Lamberti. Fleming, Brit. An. p. 333. 



Shell fusiform, elongated, smooth, tapering to both extre- 

 mities ; spire short, consisting of five gradually tapering 

 volutions, which terminate in a blunted papillose apex ; aper- 

 ture about two-thirds the length of the shell, elongated, 

 straitened and acute above, widening gradually to the 

 centre, and contracting beneath, terminating in an oblique, 

 subtruncafed base ; columella provided witli three or four 

 plaits; outer lip sharp in the edge, and with a slight sinus 

 where it unites with the body above. 



Found in the Crag Marl at Holywell, Bawdsey Cliff, and 

 Aldborough, Suffolk. 



SECTION 11. SHELLS MEDIUM SIZED, WITH SMOOTH PAPILLA. 



* Musicalis. 



10. V. NODOSA.'— The Nodulous Volute, pi. XXXI. 

 fig. 1 and 5. 



Voluta nodosa. Sowerby, Min. Conch. IV. p. 135, pi. 399, 

 fig. 2. Fleming, Brit. An. p. 333. 



Shell ovate ; spire conical, produced, nearly equal in length 

 to the body, consisting of five tumid volutions, tapering to 

 an acute apex, the lower one broad and hollow ; volutions 

 well defined, and crowned with two rows of nodulous spines ; 

 bodj' with irregular, obtuse, longitudinal ribs ; the whole 

 shell crossed by numerous and deep sulci ; aperture oblong, 

 wide in the centre, and narrowed to each extremity ; columella 

 with three plaits ; outer lip striated within. 



Found in the London Clay at Barton Cliff. 



11. V. AMBiGUA. — The Ambiguous Volute, pi. XXXI. 

 fig. 8 and 11. 



Voluta ambigua. Sowerby, Min. Conch. IV. p. 135, 

 pi. 399, fig. 1. Fleming, Brit. An. p. 332. Strombus 

 ambiffuus. Brander, Hant. fig. 69. 



Shell ovate-oblong ; spire short, rough to the touch, con- 

 sisting of five volutions, which are hollowed above, and ending 

 in a pointed apex ; the whole shell covered with irregular, 

 longitudinal ribs, which are angular above, crossed by nume- 

 rous, transverse, undulous furrows ; aperture elongated, 

 nearly the entire length of the body, wide in the centre, and 

 narrowed towards each extremity ; columella with three 

 plaits ; outer lip rising from the body above, plaited within, 

 and granulated on the edge. 



Found in the London Clay at Barton Cliff. 



SECTION III. MlTRE-SHAPED, PAPILLA ACUTE. 



12. V. Magorum. — The Magicians' Volute, pi. XXXL 

 fig. 16, 17. 



Voluta Magorum. Brocohi, Conch. Foss. Sub. II. p. 307, 

 pi. 4, fig. 2.? Sowerby, Min. Concii. IIL p. 164, pi. 290, 

 fig. 3. Fleming, Brit. An. p. 332. • 



Ovate, fusiform ; spire conical, two-thirds the length of the 

 body, consisting of five volutions, terminating in a somewhat 

 obtuse apex, with about twelve narrow ribs ; the whole shell 

 covered with fine, obscure, transverse striie, which become 

 more conspicuous towards the base ; aperture oblong ovate, 

 rounded above ; columella provided with numerous plaits, 

 which extend to the top of the pillar lip, the lower ones large, 

 with an obtuse termination, while the upper ones are small, 

 and irregularly interrupted ; outer lip smooth ; beak short, 

 slightly curved. 



Found in the London Clay at Barton Cliff. 



13. V. costata. — The Ribbed Volute, pi. XXXL 

 fig. 21, 22. 



Voluta costata. Brander, Hant. fig. 45. Sowerby, Min. 

 Conch. III. p. 163, pi. 290, fig. 1, 2, and 4. Fleming, Brit. 

 An. p. 332. 



Shell ovate, fusiform ; spire conical, consisting of six or 

 seven volutions, which terminate in an acute apex ; with about 

 nine longitudinal, broad, obtuse ribs, which are most promi- 

 nent at their upper ends ; crossed by numerous, wide, indis- 

 tinct stria?, which are nearly obsolete about the middle of the 

 body ; columella with three plaits, the lower one larger than 

 the others ; pillar lip strongly reflected on the body ; outer 

 lip smooth, slightly thickened by a rib ; aperture obloug- 

 ovate, rounded above. 



Found in the London Clay at Barton Cliff. 



Genus IX. — MITRA. — Lamarck. 



Shell turreted or subfusiform, with an acute spire, 

 which, for the most part, is longer than the aperture, 

 which is elongated, longitudinal, and notched at the 

 base, and terminating in a very short canal ; columella 

 plaited, the plaits are sharp at the edge, generally 

 parallel and transverse, with the lower ones smaller than 

 the others ; outer lip usually somewhat acute at the 

 edge, but in some instances a little thickened, crenu- 

 lated, and even provided with a blunt tooth at the upper 

 part within ; external surface in the recent state gene- 

 rally covered by a thin, horny epidermis. 



1. M. scABRA. — The Rough Mitre, pi. XXXL fig. 20 

 and 25. 



Mitra Scabra. Sowerby, Min. Conch. IV. p. 142. 

 Fleming, Biit. An. p. 334. Buccinum scabricidum. Brander, 

 Hant. fig. 20. 



Ovate, fusiform; spire nearly equal to the body in length, and 

 consisting of five or six volutions, the two upper ones smooth ; 

 the whole surface crossed by numerous, close, sharp, elevated, 

 transverse, rough strioe, and intersected by many longitudinal, 

 irregularly elevated, undulating lines of growth ; aperture 

 fusiform ; columella with four nearly uniform plaits, with two 

 more slender, and nearly obsolete ones above them, which, 

 however, are frequently wanting ; outer lip irregularly 

 thickened, with a blunt tooth-like process on the margin 

 near its centre. 



Found plentifully in the London Qay at Barton Cliff. 



