72 KELLIADiE. 



M. FERRUGiNosA, Montagu. 



Elongated, smooth, moderately inequilateral. 



Plate XVIII. figs. 5, 5 a, and 5 b, (as/erruffinea). 



Mya ferriigiiiosu, Mont. Test. Brit. Suppl. pp. 22, 166, pi. 26, f. 2. —Dorset 

 Catalog, p. 28. — Turt. Conch. Diction, p. 102. — Wood, 

 General Conch, p. 100. — Dillw. Recent Shells, vol. i. p. 46. 

 —Index Testaceol. pi. 2, Mya, f. 19. 

 Montacuta fcrruginosa, Turt. Dithyra Brit. p. 60. — Flem. Brit. Anim. p. 465. 

 — Brit. Marine Conch, p. 52, f. 16. — Haxl, Recent 

 Shells, p. 40. 

 Tellimya eUiptica, Brown, 111. Conch. G. B. p. 106, pi. 42, f. 19. 

 Eryc'ma ferruginosa, Recluz, Revue Zool. Cuv. 1844, p. 332. 

 Montacuta oLlonga (Young), Turt. DithjTa Brit. p. 61, pi. 11, f. 11, 12. — 

 Flem. Brit. Anim, p. 465. — Brit. ISIar. Conch, p. 52. — 

 Macgillivray, Moll. Aberd. p. 302. 

 Tellimya glabra (Var.), Brown, 111. Conch. G. B. p. 107, pi. 42, f. 20, 21. 

 Montacuta glabra, Macgilliv. Moll. Aberd. p. 303. — Brit. Marine Conch, 

 p. 245. 



Although to be ranked among our smaller shells, the M. 

 ferruginosa is by far the largest of the published species of 

 this genus, which at the present time is very limited in the 

 number of recorded members. The shape, which is not a 

 little variable, ranges from simply oval to oblong-elliptical, 

 the breadth being occasionally less than, but more fre- 

 quently exceeding, half the length. It is decidedly inequi- 

 lateral, although not pre-eminently so for the genus, the 

 hinder side being usually about half as large again as the 

 anterior one. Its valves are slightly ventricose, glossy, and 

 either substriated concentrically, or almost smooth ; they 

 are the former when taken (which is rarely the case) in per- 

 fect condition, and containing their animal inhabitant, but 

 the majority of cabinet specimens consist of single valves, 

 which from previous attrition have become glabrous. The 

 texture is thin, dull, fragile, but scarcely subdiaphanous, 

 and of a pure white, but the surface is often concealed by 



