GINGLYMACONCHA. MYADZ. 269 
nated Old-maid ; it is most generally found amongst pebbles in 
estuaries, and sometimes occurs in muddy sand. 
2. MYA TRUNCATA. 
Shells inflated, obliquely truncated behind and exflected, the 
left valve most convex; the epidermis ochraceous. Length 
three inches ; height two and a quarter inches. 
Mya truncata, Lister, Anim. Angl.t.v.f.36; Conch.t.cccexxvil. 
f. 269; Petiv. Gaz. t. Ixxix. f. 12; Gualt. Test. t. xci. f. D.; 
Olaf’s Isl. t. xi. f. 7; Linn. Faun. Suec. 2126; Syst. Nat. 
xu. I11l..no. 26; Penn. Brit. Zool. iv. 78. t. xl. f. 14; 
O. Fabr. Faun. Greenl. 404. no. 406 ; Chem. Conch. vi.t. 1. 
f. 1,2; Brug. Encycl. Méthod. t. cexxix. f. 2.a, 6.; Pult. 
Cat. Dorset. 27. t. i. f. 1; Donov. Brit. Shells, t. xcii. ; 
Mont. Test. Brit. 32; M. & R. Trans. Linn. Soc. viii. 35 ; 
Lam. Syst. Nat. des Anim. sans Vert. v.461; Wood, Gen. 
Conch. 1. t. xvii. f. 1,2; Flem. Edinb. Encycl. vu.; Dill. 
Desc. Cat. 42 ; Turt. Conch. Dict. 
Concha truncata, Da Costa, Brit. Conch. vi. 3. Vig. and t. 1. 
£2 33/4: 
Inhabits the sand of the sea as well as estuaries; it is very 
common in the Kingsbridge Estuary, at Salcombe, the Frith of 
Forth, and Tenby. It is said to be eaten in the Hebrides, 
where it is also very abundant. 
Genus 17. MAGDALA. 
The shell fragile, thin, inequivalve, the left valve larger and 
more convex; the umbones central; the epidermis thin; the 
process which bears the elastic opening ligament is elongate- 
triangular, moveable, and not at all excavated. The animal is 
unknown. 
MAGDALA STRIATA. | 
Shells oblong, subpellucid, narrower posteriorly and truncated, 
pearly inside; the epidermis pale fuscous, arranged into elevated 
diverging lines. Length one inch and three quarters ; height 
three quarters of an inch. 
