CERITHIOPSIS. 365 



visionally to place it with the Cancellariadte. It has 

 probably relations with Terehra. 



C. TUDERCULARE, MoiltagU. 



Brown, dextral, with three spiral rows of tubercles on each of 

 the principal whorls of the spire. 



Plate XCI, fig. 7, 8, and (Animal), Plate 0, fig. 1 and 2. 



Murcx tubercularis, Mont. Test. Brit. vol. i. p. 270 ; Siippl. p. 116. — Maton 



and Rack. Trans. Linn. Soc. vol. viii. p. 150. — Turt. 



Conch. Diction, p. 96 (not var.) — Dillw. Recent Shells, 



vol. ii. p. 758. 

 Terebra „ Fleming, Brit. Animals, p. 346. 



Cerithium luberculare, Brit. Marine Conch, p. 193, f. 8. — Searles Wood, Crag 



Mollusca, p. 70, pi. 8, f. 5, a, b. 

 „ py()mcenm, Phllippi, Moll. Sicil. vol. ii. pi. 25, f. 2G (probably). 



This shell possesses so much general resemblance to 

 G. reticulafum, that it is not easy to discriminate between 

 worn examples of it and the more slender forms of that 

 species. It is moderately strong, subulate, subcyliudrical 

 (occasionally, however, more ventricose below and less 

 produced above), more or less glossy and oj^aque, and of 

 an uniform dark or chocolate brown, which changes to 

 rufous-chestnut in dead individuals. Each of the principal 

 or lower turns of the spire — which is composed of from 

 ten to twelve volutions, the three or four first of which 

 (usually absent, from their fragility) are smooth and semi- 

 transparent — is adorned with three spiral rows (the supe- 

 rior with two series only), of large equal-sized concatenated 

 granules or beads, that are formed by the intersection of 

 very numerous and perpendicular narrow ribs, and slightly 

 more distant revolving costellse : their intervals are free 

 from any other sculpture. These rows are continuous and 

 fill the entire surface of each volution. The body scarcely 



