392 VENERIDiT:. 



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

 land, in various localities (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. 



Subcordate, subovate, concentrically closely sulcated, sulci 

 not becoming more distant posteriorly ; sides not particularly 

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

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

 yellow. 



Plate XXV. fig. 5. 



r^/as a?<rcrt, Gmelin, Syst. Nat. p. 3288.— Mont. Test. Brit. pp. 129, and 57(5. 

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

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

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

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

 p. 360.— Index Testaceol. pi. 8, f. 111. — Phiuppi, 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 nchulosa, Pultenev", Hutchins, Hist. Dorset, p. 34. 



Vemis eenea, Turt. Conch. Dithyra Brit. p. 152, pi. 10, f. 7.— Flem. Brit. 

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



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

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



Voius sinuata, 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. 



Pullasira 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 tlic 

 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, 



