80 LITTORINID^E. 



It ranges to the coasts of Sweden (Loven), and is found 

 fossil in the coralline crag- of Sutton (Searles Wood). 



There is not the slightest ground for regarding this 

 species as the type of a genus distinct from Rissoa. 



R. CRENULATA, Michaud. 



Oval-acute, solid, coarsely cancellated by longitudinal and 

 spiral costellffi, of which latter there are not more than three 

 rows on the penult whorl ; throat crenated. 



Plate LXXIX. fig. 1,2. 



Turlio cancellatus. Da Costa, Brit. Conch, p. 104, pi. 8, f. G, .0. 

 „ dmex, (not Linn.) Donovan, Brit. Shells, vol. i. pi. 2, f. 1. — IMont. Test. 

 Brit. vol. ii, p. .315. — Maton and Rack. Trans. Linn. Soc. 

 vol. viii. p. 161. — Rack. Dorset Catalog, p. 49, pi. 14, f. 6, 9. — 

 TuRT. Conch. Diction, p. 210. — Dillw. Recent Shells, vol. ii. 

 p. 821.— Wood, Index Testaceolog. pi. 30, f. 15. 

 Cingula „ Fleming, British Animals, p. 305. — Brit. Marine Conch, p. 174. 

 Rissoa crenulata, Michaud, Nouv. Especes de Riss. p. 15, f. 1, 2. — Potiez and 

 Mich. Gal. Donai, Moll. vol. i. p. 269. — Desh. Lam. Anim. 

 s. Vert. (ed. Desh.) vol. viii. p. 465. — Philipfi, Moll. Sicil. 

 vol. ii. p. 126. 

 „ cimcr. Brown. Illust. Conch. G. B. p. 11, pi. 8, f. 21, 22. 



As the name given by Da Costa, in one of his many 

 ungenerous attempts to deprive Linnoeus of the honour of 

 nomenclature, was bestowed by him on a shell which he 

 erroneously believed had already received a prior appella- 

 tion, it cannot take precedence of the subsequent one by 

 Michaud. 



This well known Rissoa, perhaps one of the most dif- 

 fused species of its genus, has an ovate acute figure, is 

 strong, yet a little translucent, and is of an uniform 

 yellowish white, or merely with a subsutural zone of 

 fulvous, and another near the basal extremity of the shell. 

 The exterior is coarsely cancellated throughout by equal- 



