MALACOZOA. TROPIOPODA. LAMELLIBANCHIATA. 227 



brown, or purple of various tints ; the inner surface also 

 coloured, conformably or uniformly. Length eleven-twelfths, 

 breadth an inch. 



Not uncommon in deep water off Aberdeen. Dead valves 

 frequently brought up from deep water by the lines ; live in- 

 dividuals now and then. In the Winter of 1 841-42, Mr. 

 Leslie, Mr. Davidson, and others, obtained specimens ; in Sep- 

 tember following Miss Macgillivray obtained a vast number 

 at Gamrie, which had been taken from the stomachs of 

 Flounders. 



Pecten obsoletus. Penn. Brit. Zool. iv. 102. PI. 61. f. 66. Ed. 2. 

 iv. 222. PI. 64. f. 3. Pecten obsoletus. Mont. Test. Brit. 149. 

 Suppl. 57. Pecten obsoletus. Turt. Brit. Biv. 213. PI. 9. f.6. 

 Pe ten obsoletus. Flem, Brit. Anim. 385. 



9. Pbcten Itevis. Smooth Scallop. 



Shell orbicular, subtriangular, little convex, very thin, fra- 

 gile, semitransparent, glossy; the valves nearly equal, with 

 the two sides equally angulato-rotundate ; the auricles unequal, 

 the larger with its lateral outline vertical, the smaller deeply 

 striated ; the external surface smooth, but with obsolete con- 

 centric rugae, the internal obsoletely undulated transversely, 

 with faint divergent striules ; the colour various, yellowish or 

 whitish, spotted with red or white. Diameter seven-twelfths 

 of an inch. 



This species is perfectly distinct from any variety of Pecten 

 obsoletus, or of the following, which it closely resembles in 

 some respects. 



Found by me at Aberdeen, in October, 1842, 



Pecten lee vis. Penn. Brit. Zool. iv. 223. Pecten laevis. Mont 

 Test. Brit Suppl. 61. Pecten laevis. Turt. Brit Biv. 213. Pec- 

 ten laevis. Flem. Brit Anim. 385. 



10. Pecten similis. Laskeifs Smooth Scallop* 



Shell orbicular, flattish, very thin, fragile, semitransparent, 

 smooth, glossy ; the valves nearly equal, with one side more 

 produced; the umbones nearly central, pointed; hinge-line 

 straight; auricles nearly equal in length, smooth, the larger 

 with its lateral outline sloping ; colour various. One indivi- 

 dual white, with transverse red bands ; another yellowish- 

 white, irregularly variegated with white and brownish-red ; 

 another greyish-white or hyaline, with a few very faint red 

 markings. Length three-twelfths, breadth three-twelfths and 

 a quarter. 



