Purpura. MOLLUSCA. BUCCINID^. 341 



six or seven, closely ribbed ; apex sharp ; aperture oval, narrow ; outer lip 

 denticulated within ; inner lip crenulated by the spiral striae at the base. 



312. N. tuhcrculata. — Outer lip simple externally ; inner lip 

 strongly marked with oblique striae. 



B. tuber. Turt. Conch. Diet. 16 Found in the sand at Exmouth, Mrs 



C, W. Luscombe. 

 " Shell taper, white, but not glossy ; spires six, rounded, and well defined 

 by the line of junction, with numerous strong longitudinal ribs, crossed by 

 fine transverse lines, giving them a tubercled appearance ; aperture oval ; the 

 outer lip thin and toothed within ; inner lip strongly marked with oblique 

 striae, and ending in a short, reflected, rather cloven canal ; length six-tenths 

 of an inch ; breadth not a third of its length." Turton. 



EXTINCT SPECIES. 



1. N. gramilata. — Shell ovate, pointed, transversely striated, and with 

 twenty rows of longitudinal tubercles ; outer lip thickened, many toothed 

 within. — Buccinum gran. Sower. Min. Conch, t. ex. f. A.— In Crag, Ipswich. 



2. N. canaliculata. Ovato-elongated, transversely striated ; spire costated ; 

 whorls separated by a canal ; lip thickened, sharp, dentato-striated within. 

 (Buc. desertum, Brander, f. 18, 19); B. can. Sower. Min. Conch, t. ccccxv. 

 f. 2. London Clay. 



Gen. LXXIII. PURPURA. — Shell strong; aperture ovate ; 

 outer lip flattened, denticulated ; inner lip flattened ; canal 

 short, imbedded. 



313. P. Lapillns. — Whorls six, spirally striated, with waved 

 longitudinal striag and wrinkles. 



Buccinum minus, List. An. Ang. 158. t. iii. f, 5, 6. Conch, t. Dcccclxv. 

 f. 18, 19 — B. Lap. Linn, Syst. i. 1202. Mont. Test. Brit. 239.— Com- 

 mon in rocks below high water-mark. 

 Length from 1 to 2 inches ; white, yellowish, or banded with brown or yel- 

 low ; whorls slightly elevated, varying greatly in the spiral striae or ridges, 

 and likewise in the longitudinal markings, which last are sometimes scaly ; 

 aperture ovate ; outer lip sloping outwards to a thin edge, the inner edge of 

 the slope denticulated, and terminating abruptly at the canal ; pillar-lip 

 broad, the pillar slightly concave towards the base ; in young shells the outer 

 lip is thin — This species is very destructive to mussel beds, by perforating 

 the shell, in order to feed on the contained animal. 



EXTINCT SPECIES. 



1. p. crispatum.—Ov3Xe, acuminated, roughened by imbricated, concave 

 scales, placed upon numerous close transverse carinae ; whorls convex ; lip 

 subdentated ; beak subcanaliculated. — Buc. crisp. Sower. Min. Conch, t. 

 ccccxiiL^Cra^. 



2. B. tetragonum. — Squarish, ovate, pointed, costated ; costae crossed by four 

 large and several small ridges ; aperture oblong; lip toothed within.— Buc. 

 Sower. Min. Conch, t. ccccxiv. f. 1. — Crag. 



3. p. incrassatum. — Thick ; ovate, pointed, ridged ; with about five carinae, 

 the uppermost largest ; aperture oval ; lip obscurely furrowed within. — Buc. 

 Sower. Min. Conch, t. ccccxiv. — Crag. 



