92 LITTORINID^. 



11. COST AT A, Adams. 



Obloiig-turreted, white ; whorls with strong longitudinal ribs : 

 base with a spiral carina : lip marginated ; throat smooth. 



Plate LX XVIII. fig. 6, 7. 



Turbo codaius, Adams, Trans. Linn. Soc. vol. iii. pi. 13, f. 13, 14 (probably). — 

 Mont. Test. Brit. vol. ii. p. 31 1, pi. 10, f. 6. — Maton and 

 Rack. Trans. Linn. Soc. vol. viii. p. 174. — Rack. Dorset 

 Catalog, p. 51, pi. 19, f. 5.— Turt. Conch, Diction, p. 214. — 

 DiLLW. Recent Shells, vol. ii. p. 860. — Wood, Index Testae, 

 pi. 31, f. 107. 

 „ plicalus, MuHLF. Verb. Nat. Berlin, vol. i. pi. 9 (also called 3), f. 2. 

 Cinyula costata, Fleming, Brit. Animals, p. 305. — Brit. Marine Conch, p. 175. 

 Rissoa cxiijua, MicHAUD, Especes de Rissoa, p. 18, f. 29, 30 (not well). — Potiez 

 and Mich. Gal. Douai, Moll. vol. i. p. 269.— Desk, in Lam. 

 Anim. s. Vert. (ed. Desh.) vol. viii. p. 481. — Philippi, Moll. 

 Sicil. vol. ii. p. 125.— Menke, Zeitsch. Malak. 1845, p. 42. 

 Civgida carinata, Philippi, Moll. Sicil. vol. i. p. 150, pi. 10, f. 10 (not well). 

 liissoa costata, Johnston, Berwick. Club. vol. i. p. 273. — Brown, lUiist. Conch. 

 G. B.p. 11, pi. 9,f. 74. 



This beautiful little shell is moderately strong, a little 

 translucent, often with a vitreous lustre, and of an oblong 

 turreted contour. It is of an uniform white, and its sur- 

 face is traversed, as well by strong distant and obliquely 

 longitudinal ribs, as by crowded and spiral stria). The 

 latter, which under the microscope show themselves to be 

 slightly elevated, are chiefly perceptible in the interstices 

 of the cost?c ; the former commence at the suture, but do 

 not extend, upon the body, to the extreme base, but are 

 interrupted by a very prominent spiral carina, that revolves 

 from the top of the inner-lip to the anterior corner of the 

 outer lip, from the marginated rim of which last it is sepa- 

 rated by a narrow and somewhat concave strip of surface. 

 The body is scarcely, in general, so long as the spire, which 

 is composed of five somewhat vontricose turns, that are 

 l)rofoundly, rather abruptly, and often subangulately divided 



