282 TRIBE PECTINIDES; 
valve alternately irregular in size, longitudinally lineated, and 
finely squamular, rays of the lower valve similarly irregular 
and papillary, but disposed in pairs; one ear minute. +4. Cor- 
sica; not unlike Pusio, (of Sow.) but the ribs larger and more rugose. 
P. Lanpssurai*, Forbes Wern. Mem 8, t. 2, f. 2.—P. Acu- 
LEATus. Jeffrey’s in Conch. Mag.—Sow. Th. f. 47.—Ch. f. 
637, b.e. Equivalve, suboval, thin, with radiating strize which are 
rough with raised dots and minute spines: ears unequal, the pos- 
terior large, the anterior small, and in one valve strongly emargi- 
nated ; pale yellow, clouded with red. =%)....4.. Great Britain. 
P. Cornevus. Sow. Th. f. 44,5 and 244,5. Transparent, thin, 
horn coloured, equivalve, rounded oval, obliquely subequilateral ; 
ears unequal and ribbed, striated at the base, the anterior small, 
the posterior large; ribs smooth, indistinct, flattened, crowded, 
the interstices with most minute concentric strie. Youne. Radi- 
ated with several brown bands. $...3’9: Magellan. 
P. Ozsotetus*. Pennant 4, p. 222, t.64, f. 3.—Don. ¢. 1, f. 2.— 
Turt. B., p. 218, t. 9, f, 6.—Ostrea,O. D. p. 263.—Sow. Th. f. 74, 
75, 79,—W. t.10,f. 37. P. Trrrapiatus, Fuci, Ticerinus. Muller 
Zool. D. t. 60,f. 1 to 8.—Ostrea, T. Gmel. 3327.—D. p. 258. 
W. t. 10, f. 27.—P. Domesticus. Ch. f. 2031 to 6. Oval sub- 
triangular, subventricose, equivalve, subequilateral, smooth or 
obsoletely striated ; the ears very unequal, the anterior minute and 
quite smooth, the posterior large and sulcated; varying in colour, 
usually mottled with large spots of purple and white upon a yellow 
or light purple ground. England, §c. 
P. Hasratus. Son. Th. f. 236. Oval subtriangular, rather 
elongated, rough; ears unequal, the anterior minute, the posterior 
large roughly suleated; upper valve with eight unequal very ele- 
vated angular ribs armed with numerous erect slightly curved sharp 
spines, numerous smaller spinose ribs in the interstices ; lower 
valve with twenty-two more nearly equal ribs, with more numerous 
and smaller spines on the angles: red, white within. 145 220;95. 
P. Virreus. Chem. 7, f. 687,a.—Phil. Conch. Pecten, t. 2, f. 3. 
—Ostrea, V. W. t. 10, f. 86. Nearly orbicular, thin; one of 
the valves milky white, flattened convex, with rather distant con- 
centric striz, which, when magnified, appear to have their lower 
edges indented at regular intervals, and very delicate minute radi- 
ating strie; auricles very unequal. +...3. Aecording to Chemniz 
it is found in the Northern Seas, and is equivalve, but our descréption 
is derived from only a single valve. This species is quite distinct 
from the Vitreus of King (Zool. Jour.) or of Sowerby. (Thes. 
Conch.) 
P. Ornatus. Lam. 50.—Sow. Th. £.77, 78, 80.—Ch. f, 625, 6, 7 
