TELLINA. 387 



rating* the valves by a lanceolate gap or depression, which 

 would be a lunule if the ligament were not interposed and 

 were seated (as in the Veneridce) on the other side of the beak : 

 corselet long and rather deeply excavated ; its colour, as well 

 as that of the ligamental depression, is carnation : hinge-line 

 obtusely angular: hinge-plate thick, twice as broad on the 

 posterior as on the anterior side : teeth, in the right valve two 

 small cardinals, that under the beak on the posterior side being 

 the larger, triangular, and slightly cloven, besides a short but 

 strong anterior lateral near the cardinal tooth on that side, and 

 a remote and smaller lateral on the other side ; the left valve 

 has similar cardinals, reversed in position, but no lateral tooth: 

 inside highly polished and glossy, longitudinally striated to- 

 wards the front margins, which are thickened, of an orange 

 tint, usually marked with the posterior ray, and sometimes 

 with another ray or streak of the same colour on the anterior 

 side : pallia! scar having a triangular sinus, which is shaped 

 like a foot and ankle (as it is also in all the species of the pre- 

 ceding section), very large, extending at the upper end for 

 three-fourths of the distance from the front margins to the 

 beaks, and at the sides to the edges of the muscular scars : these 

 last are large and irregularly oval. L. 0-8. B. 1. 



Var. 1. Lantivyi. Shell of a thinner texture, whitish or 

 faintly tinged with yellowish-pink, not rayed. T. Lantivyi, 

 Payraudeau, Moll. Cors. p. 40, pi. i. f. 13-15. 



Var. 2. distorta. Shell rather more compressed, and less 

 inequilateral in consequence of the posterior side being more 

 produced and not so truncate as in the typical form, with a 

 sharper point at that end. T. distorta, Poli, Test. Sic. 1. 15. 

 f. 11. 



Habitat : Southern, western, and eastern coasts of 

 England, North and South Wales, all Ireland, and west 

 of Scotland, in shell-sand and among nullipores, in 4-25 

 fathoms. Scarborough (Bean); Northumberland and 

 Durham, rare (Alder) ; Holy Island (Eyton). I am 

 not certain of any more northern locality, at home or 

 abroad. Var. 1. Ullapool (J. G. J.). Var. 2. Exmouth 

 (Clark); Loch Carron (J. G. J.); Hebrides (Barlee). 

 This species occurs in a fossil state at Banff (J. Smith) ; 

 Coralline Crag (S.Wood); Subapennine tertiaries (Broc- 



s2 



