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. \\. Cor- 

 sica ; not unlike Pusio, (of Sow,) but the ribs larger and more rugose. 



P. Landsburgi*, Forbes Wern. Mem 8, t. 2, /. 2. — P. Acu- 

 leatus. Jeffrey's in Conch. Mag. — Soiv. Th. f. 47. — Ch. f. 

 637, b, c. P^quivalve, suboval, thin, with radiating stria? 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. -fo"--i' Great Britain. 



P. Corneus. 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 striae. Young. Radi- 

 ated with several brown bands. J...i7 - Magellan. 



P. Obsoletus*. Pennants, p.^222, £.64,/. 3.— Don. t.\,f. 2.— 

 Turt. B.,p. 213, t. 9,f, 6.— Ostrea,0. D. p. 263.— Sow. Th.f.74<, 

 75, 79, — W. 1. 10,/. 37. P. Triradiatus,Fuci, Tigerinus. Muller 

 Zool. D. t. 60,/. 1 to 8.— Ostrea, T. Gmel. 3327.— B. p. 258. 

 W. t. 10,/. 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, fyc. 



P. Hastatus. Sow. Th. f. 236. Oval subtriangular, rather 

 elongated, rough ; ears unequal, the anterior minute, the posterior 

 large roughly sulcated ; 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. 1,15. ..0,95. 



P. Vitreus. Chtm. 7 ,f 637, a. — Phil Conch. Pecten, t. 2,/. 3. 

 — Ostrea, V. W. t. 10, /. 36. Nearly orbicular, thin; one of 

 the valves milky white, flattened convex, with rather distant con- 

 centric striae, which, when magnified, appear to have their lower 

 edges indented at regular intervals, and very delicate minute radi- 

 ating striae ; auricles very unequal. f..-f« According to Chemniz 

 it is found in the Northern Seas, and is equivalve, but our description 

 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. f.77, 78 3 80.— Ckf. 625,6. 7 



