Terebra. 



MOLLUSCA. 



49 



'2. M. PARVA The Small Mitre, pi. XXXL fig. 24 and 27. 



3Jitra parva. Sowerby, iNIin. Concli. V. p. 37, pi. 430, 

 fig. 1. Fleming, Brit An. p. 334. 



Shell ovate, fusiform, short; spire consisting of four rather 

 tumid volutions, with their upper edges well defined by the 

 suture ; the whole shell covered by equal transverse furrows, 

 the upper one on each volution being wider than the others 

 produces a marginated appearance ; between the sulci 

 the surface is smootli and siiining ; aperture elongated, 

 somewhat straitened above ; columella with four plaits ; 

 outer lip plaited within. Lengtii, a quarter of an inch ; 

 diameter, an eighth. 



Found plentifully in the London Clay at Barton Cliff. 



3. M. PUMiLA.— The Dwarf Mitre, pi. XXXI. fig. 23 

 and 26. 



Mitra pumila. Sowerby, Min. Conch. V. p. 37, pi. 430, 

 fig. 2. Fleming, Brit. An. p. 834, 



Shell ovate, fusiform, short ; spire consisting of five some- 

 what inflated volutions well defined by the suture, crenated 

 above, and terminating in a sharp apex ; the whole shell 

 covered with pretty deep transverse sulci, which are decus- 

 sated by numerous, slightly elevated, longitudinal, equidistant 

 ribs, dividing the sulci into regular square meshes, and pro- 

 ducing a rough appearance ; aperture elongated, acute above ; 

 columella with four plaits ; outer lip plaited within. 



Found in the London Clay at Barton Clifl^ 



FAMILY in.— PURPURIFERA. 



Shell with a short canal, ascending posteriorly, or 

 with an oblique notch at the base of its aperture, 

 directed backwards. 



SUBDIVISION I. SHELLS HAVING AN OBLIQUE NOTCH 



DIRECTED BACKWARDS. 



Genus X. — TEREBRA. — Lamarck. 



Shell greatly elongated, subulate, turreted, acumina- 

 ted, usually with many volutions, which decrease 

 gradually in dimensions from the base to the apex ; 

 aperture longitudinal, generally a third shorter than the 

 spire, frequently much shorter, and notched at its 

 posterior base ; base of the columella contorted and 

 oblique, provided with a short canal; operculum cor- 

 neous, but not spiral. 



1. T. VETUSTA. — The Ancient Terebra, pi. XXXII. 

 fig. 44. 



Terebra vetusta. Phillips, Geo. of Yorkshire, I. p. 1 52, 

 pi. 9. fig. 27. 



Shell consisting of eleven or twelve gradually tapering 

 volutions, terminating in an acute apex, and divided by a 

 pretty deep suture ; whole shell with longitudinal, straight, 

 and moderately strong ribs ; aperture elongated. 



Found in the Bath Oolite at Cioughton, Yorkshire. 



2. T. MELANoiDES. — The Blackish Terebra, pi. XXXII. 

 fig. 45. 



Terebra melanoides. Phillips, Geo. of Yorkshire, I. p. 130, 

 pi. 4, fig. 13. 



Shell consisting of thirteen or fourteen abruptly tapering 

 volutions, terminating in an acute apex, with wide-set longi- 

 tudinal ribs, which reach from the upper margin to the centre 

 of each volution ; aperture straitened above and below. 



Found in the Coralline Oolite at Pickering, Yorkshire. 



3. T. GRANULATA. — The Granulated Terebra, pi. XXXIL 

 fig. 43. 



Terebra granulata. Phillips, Geo. of Yorkshire, I. p. 130, 

 pi. 7, fig. 16. 



Shell with thirteen or fourteen gradually tapering volu- 

 tions, the whole shell with strong spiral granulated strias ; 

 aperture somewhat rounded above and narrowed below ; 

 pillar lip a little reflected on the columella, and widened at 

 the base ; outer lip plain. 



Discovered in the Coralline Oolite at Pickering, York- 

 shirp. 



Genus XL— BUCCINUM.— Z-»m«>«s. 



Shell subovate, or ova to-conical, seldom elongated ; 

 subturreted ; apex a little obtuse; spire of medium 

 length, somewhat abruptly acuminate, but seldom of 

 greater length than the aperture, which is suborbicular, 

 or a little longer than wide ; notched at the base, and 

 hardly acute at its upper termination, where there is 

 sometimes a small tooth-like process, formed by the 

 thickening of the inside of the outer lip, with frequently 

 a similar tooth opposed to it at the superior part of 

 outer lip, these enclosing a small sinus ; outer lip rather 

 acute at the edge, sometimes internally and transversely 

 grooved, and,in some instances, with a dentated margin ; 

 columella smooth, sometimes a little roughened at its 

 inferior extremity ; canal generally very short and 

 straight; operculum horny and thickened. 



1. B. LAVATUM. — The Washed Bucoinum, pi. XXXII. 

 fig. 1, 2. 



Buccinum lavatum. Brander, Foss. Hant, fig. 16. Sower- 

 by, Min. Conch. V. p. 11, pi. 412, fig. 3, 4. Fleming, Brit. 

 An. p. 345. 



Oblong-ovate, consisting of six considerably acuminated 

 and convex volutions, terminating in a short apex, with many 

 prominent, longitudinal, equal, curved ribs, crossed by nume- 

 rous strong spiral striee, which feel rough to the touch ; aper- 

 ture oblong, somewhat contracted above ; outer lip striated 

 internally ; crenulated at the margin, and destitute of a 

 sinus. 



Found plentifully in the Blue Clay at Barton Cliff". 



2. B. GRANULATUM. — The Granulated Buccinum, pi. 

 XXXII. fig. 7. 



Buccinum granulatum. Sowerby, Min. Conch. 11. p. 18, 

 pi. 110, fig. 4. Nassu granulatum. Fleming, Brit. An. 

 p. 341. 



Shell oblong-ovate, consisting of five or six broad sliglitly 

 inflated volutions, tapering to an obtuse apex ; transversely 

 striated, and furnished with twenty rows of moderately ele- 

 vated tubercles, arranged in the form of longitudinal ribs, and 

 sometimes largest on the upper margin of the volutions ; 

 aperture elongated, and slightly oblique; inner lip smooth, 

 and reflected on the columella, with a tooth on its upper 

 part, situate opposite one on the outer lip, producing the 



N 



