392 VENERIDiE. 



Donaghadce, in eight fathoms (Patterson) ; north of Ire- 

 land, in various locaHties (Thompson and Hyndman). 



It ranges from Norway to the Mediterranean, but its 

 capital is in the Celtic province. As a fossil it dates its 

 appearance from the epoch of the red crag. 



T. AUREA, Gmelin. 



Stibcordate, subovate, concentrically closely sulcated, sulci 

 not becoming more distant posteriorly ; sides not particularly 

 unequal; ventral margin more or less arcuated : umbones ven- 

 tricose, and rather prominent : inner surface of a deeper or paler 

 yellow. 



Plate XXV. fig. 5. 



F>w«s«?«-m, Gmelin, Syst. Nat. p. 3288. — Mont. Test. Brit. pp. 129, and 576. 

 — Linn. Trans, vol. viii. p. 90, pi. 2, f. 9. — Dorset Catalog, p. 

 36, pi. 13, f. 3.— TuRT. Conch. Diction, p. 247.— Fjlkm. Brit. 

 Anim. p. 449, — Brit. Marine Conch, p. 92. — Dillw. Recent 

 Shells, p. 207. — Lamarck, Anim. s. Vert. (ed. Desh.) vol. vi. 

 p. 3C0.— Index Testaceol.pl. 8, f. 11 1.— Philippi, Moll. Sicil. 

 vol. i. 'p. 47, and vol. ii.p. 35. — Hanl. Recent Shells, vol. i. 

 p. 123, pi. 8, f. 111.— TuRT. Conch. Diction, p. 248. 



Venus ■nclmlosa, Pulteney, Hutchins, Hist. Dorset, p. 34. 



Veims (Bnca, Turt. Conch. Dithyra Brit. p. 152, pi. 10, f. 7. — Flem. Brit. 

 Anim. p. 449. — Brit. Marine Conch, p. 91. 



Venus niiens, Turt. Conch. Diction, p. 247.— Turt. Dithyra Brit. p. 157, pi. 10, 

 f. 8.— Flem. Brit. Anim. p. 449.— Brit. Marine Conch, p. 93. 



Venus sinuala, Turt. (not Penn.) Conch. Diction, p. 242. — Turt. Dithyra Brit, 

 p. 155, pi. 9, f. 7, 8.— Flem. Brit. Anim. p. 449.— Brit. Ma- 

 rine Conch, p. 92. 



Pullastra aurea. Brown, 111. Conch. G. B. p. 89, pi. 36, f. 5, 7, 8. 



The subject of our description is prone to much varia- 

 tion both in form and markings, our ordinary British speci- 

 mens being in proportion so much broader than those of the 

 Mediterranean, that the identity of the two might almost 

 be doubted, did not intermediate gradations definitely esta- 

 blish it. Its general outline is subovate and subcordiform ; 

 it is tolerably strong, opaque, moderately inequilateral, 



