MALACOZOA. TROriOPODA. LAMELLIBRANCHIATA. 225 



Ostrea varia. Linn. Syst, Nat. 1 146. Ostrea varia. Penn. Brit. 

 Zool. iv. 101. PI. 61. f. 64. Pecten varius. Mont. Test. Brit. 146. 

 Pecten varius. Larnk. Syst. vi. 175; Ed. n. vii. 147. Pecten 

 varius. Flem. Brit Anim. 384. Pecten varius. Turt. Brit. Biv. 

 146. 



4. Pecten Isabella. Isabella's Scallop. 



Shell ovato-rotundate nearly equivalve, little convex, with 

 twenty-four slender, compressed, rounded ribs, having very 

 numerous elevated thin-edged lamellae, rising toward the mar- 

 gin into triangular, compressed, pointed spines ; the grooves 

 with transverse scalar lamellae, not extending over the ridges ; 

 the ears very unequal being in length as one to two, diver- 

 gently sulcate, transversely lamellate, and echimate ; the mar- 

 gins of the upper valve under the auricular sinus with four 

 free curved conical spinelets, of which a series is continued to 

 the smooth and glossy umbo ; the colour white, the lower 

 valve tinged with" pink. Length three-twelfths and a fourth, 

 breadth two-twelfths and three-fourths. 



The animal yellowish-white, with the margins of the man- 

 tle-lobes marked with carmine dots. 



Found by me among ascidise and corallines in a dead valve 

 of Cyprina Islandica, brought from deep water off Aberdeen. 



This most beautiful Pecten cannot be at all confounded with 

 Pecten varius, or Pecten niveus, to which it is allied in its mode 

 of echination. I have named it after my daughter Isabella, 

 who has greatly aided me in adding to the number of Mol- 

 hisca of which my catalogue consists. 



5. Pecten sinuosus. Distorted Scallop. 



Shell somewhat orbicular, with the upper valve less convex, 

 both irregularly undulated or distorted, and marked with 

 about forty crowded, unequal, variously distorted, more or less 

 scaly or spinous ribs ; the ears generally large, often very 

 unequal, sometimes nearly equal; the colours various, ge- 

 nerally red and white. Diameter nearly two inches. 



Found by Mr. Alexander Murray in the parishes of Peter- 

 head and St. Fergus, and in Cruden Bay, in September, 1842 ; 

 by me on the beach, near Don-mouth, in October. 



Pecten minimus augustior, inaequalis, &c. Lister. Anim. Angl. 

 186. PI. 5. f. 31. Ostrea sinuosa. Gmel. Linn. Syst. Nat. 3319. 

 Ostrea Pusis. Penn. Brit Zool. iv. PI. 61. f. 65. Pecten distortus. 

 Mont. Test. Brit. 148. Pecten sinuosus. Turt. Brit. Biv. 210. 

 Pecten sinuosus. Lamk. Syst. vi. 175; Ed. n. vii. 148. Pecten 

 sinuosus. Flein. Brit. Anim. 384, 



