260 AVICULACEiE. 



Pern A 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. 



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

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

 Shells, vol. i. p. 258. 

 ,, ephippium, Sowerby (not Lam.) Genera Shells, Pema, f. 2. — Reeve, 

 Conch. Sj^stem. pi. 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 ty2)e, which exactly resembles the figure of the 

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

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



