242 SOLENIDiE. 



existing species are distributed all over the world, without 

 regard to climate, those from tropical seas often closely 

 simulating those from arctic regions, though specifically 

 distinct. 



S. MARGiNATus, Pulteuey. 



Straight, margined by a stricture in front ; hinge terminal ; 

 a single tooth in each valve. 



Plate XIV. fig. 1, and (animal, siphon only) Plate I. f. 3. 



Solen vagina, Penn. (not Linn.) Brit. Zool. ed. 4, vol. iv. p. 83, pi. 46, f. 3. — 

 Mont. Test. Brit. p. 48, and Suppl. p. 25. — Dorset Catal. p. 

 28, pi. 4, f. 8.— TuRT. Conch. Diction, p. 159 ; Dithyra Brit, 

 p. 79, pi. 6, f. 4.— Flem. Brit. Anim. p. 458. — Brit. Marine 

 Conch, p. 34.— Brown, 111. Conch. G. B. p. 112, pi. 47, f. 2.— 

 PoLi, Testae. Sicil. vol. i. pi, 10, f. 5, 6. — Wood, General 

 Conch, p. 119, pi. 27, f. 1.— Dillw. Recent Shells, p. 57.— 

 Lam. Anim. s. Vert. (ed. Desh.) vol. vi. p. 53 (not vars.). — Index 

 Testaceol. pi. 3, Solen, f. 3 — Mawe, Conchology, pi. 5, f. 3. — 

 Desh. Elem. Conch, pi. 6, f. 4, 5, 6.— Phil. Moll. Sicil. vol. i. 

 p. 4 and vol. ii. p. 4. — Hanl. Recent Shells, p. 11. — Chenu, 

 111. Conch. Solen, pi. 1, f. 1. — Phil. Neu Conch. Solen, pi. 1, 

 f. 4.— CuviER, R. Anim. (ed. Croch.) pi. 111. f. 3.— Exped. 

 Scien. Alger. Moll. p. 179, pi. 10, f. 1, to 5 (shell and 

 animal). 



Solen marginatus, Pulteney, in Hutchins' Dorset, p. 28. — Donov. Brit. Shells, 

 vol. iv. pi. 110. 



The valves of this species, which is longitudinally elon- 

 gated, the length averaging about six times the breadth, 

 are quite straight, rather solid, and of a somewhat com- 

 pressed subcylindrical form. They are less shallow than 

 in the two succeeding Salens, and when in fine condition, 

 are partially covered with a rather glossy ashy-olivaceous 

 very thin and caducous epidermis, beneath which the sur- 

 face, which is almost smooth, or, at most concentrically 

 substriated, is of an uniform tint, being whitish, or tinged 

 with alternately deeper and paler shades of orange buff- 

 colour. The dorsal and ventral margins run parallel to each 



