260 AVICULACEiE. 



Perna alata, Gmelin. 



Knorr, Delices des Yeux, pt. vi. pi. 21, f. 1. 

 Ala corvi pendula, Chemn. Conch. Cab. vol. vii. p. 253, pi. 59, f. 581. 

 Ostrea alata, Gmelin, Syst. Nat, p. 3339. — Dillw. Recent Shells, vol. i. p. 283. 



„ perna, Wood, Index Testaceolog. pi. 11, f. 78. 

 Perna obUqua, Lam. Anim. s. Vert. (ed. Desh.) vol. vii. p. 75. — Hanl. Recent 

 Shells, vol. i. p. 258. 

 „ ephippiim, Sowerby (not Lam.) Genera Shells, Perna, f. 2. — Reeve, 

 Conch. System.pl. 106, f. 2. 

 Crenatula Travisii, Turt. Mag. Nat. vol. vii. p. 350, f. 47.— Brown, Illust. 

 Conch. G. B. p. 75, pi. 23, f. 20. 



A West Indian shell ; introduced by Turton as found at Scar- 

 borough. The type, which exactly resembles the figure of the 

 young shell attached to the adult Perna, in the Genera of Shells 

 by Mr. Sowerby, was taken from the bottom of a foreign vessel. 



