MOLLUSCA. BUCCINID^. 
Purpura. 
341 
six or seven, closely ribbed ; apex sharp ; aperture oval, narrow ; outer lip 
denticulated within ; inner lip crenulated by the spiral strise at the base. 
31 S. N. tuherculata . — Outer lip simple externally; inner lip 
strongly marked with oblique strise. 
B. tuber. Turt. Conch. Diet. 16. — Found in the sand at Exmouth, Mrs 
Cl W. Luscmibe. 
“ 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 Hp strongly marked with oblique 
strise, 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. granulata^ — Shell ovate, pointed, transversely striated, and with 
twenty rows of longitudinal tubercles ; outer lip thickened, many toothed 
within. — Buccinum gran. Sower. Min. Conch, t. cx. f. 4:.— In Crag^ Ipswich. 
2. N. canaliculata. Ovato-elofigated, transversely striated ; spire costated ; 
whorls separated by a canal ; lip thickened, sharp, dentato-smated within. 
(Buc. desertum, Brander., f. 18, 19) ; B. can. Sower. Min. Conch, t. ccccxv. 
f. 2. London Clay. 
Gen. LXXIIT. PURPURA. — Shell strong ; aperture ovate ; 
outer lip flattened, denticulated ; inner lip flattened ; canal 
short, imbedded. 
313. P. Lapillus. — Whorls six, spirally striated, with waved 
longitudinal striae and wrinkles. 
Buccinum minus. List. An. Ang. 158. t. iii. f. 5, 6. Conch, t. dccccIxv. 
f. 18, 19. — B. Lap. Linns 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 strise 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. empa^wm.— Ovate, acuminated, roughened by imbricated, concave 
scales, placed upon numerous close transverse carinse ; whorls convex ; lip 
subdentated ; beak subcanaliculated. — Buc. crisp. Sower. Min. Conch, t. 
ccccxiii.— 
2. B. tetragonum. — Squarish, ovate, pointed, costated ; costse crossed by four 
large and several small ridges ; aperture oblong; lip toothed within.— Buc. 
Sower. Min. Conch, t. ccccxiv. f. 1. — Crag. 
3. P. incrassatwm. — Thick ; ovate, pointed, ridged ; with about five carinse, 
the uppermost largest ; aperture oval ; lip obscurely furrowed within.— Buc. 
Sower, Min. Conch, t. ccccxiv— 
