84 LITTORINIDJE. 



eighth of an inch, and the breadth ahont three-quarters 

 of a Hne. 



This Bissoa is a scarce species, and apparently confnied 

 to the south of Great Britain and west of Ireland. Ilerm 

 (S. II.) ; Shellness, Kent; Whitesand Bay (Jeffreys) ; in 

 from fifteen to twenty fathoms off Penzance (M' Andrew 

 and E. F.) ; in fifty fathoms, dead, off Mizen Head 

 (M'Andrew) ; " collected by Mr. Warren, at Kilkee, in 

 Clare, Ireland'' (W. Thompson). 



It probably ranges along all the south-western coast of 

 Europe, and was one of the Eissoce dredged by Mr. 

 M'Andrew at Vigo in Spain. 



11. ]3eanii, Hanley. 



Oblong-conic, strong, wholly or partially decussated or subcau- 

 cellated by longitudinal and spiral raised lines, of which last 

 there are six rows on the penult volution. Apex rather acute : 

 penult whorl not particularly swollen. Suture excavated. Mouth 

 subovate, rather small : throat crenated. 



Plate LXXIX. fig. 5, 6. 



Cinytda Deanii, IIanley, Brit. Marine Conch, p. xli. fig. 43. 



Rissoa „ LovKN, Index Moll. Scandinav. p. 24 (from specimens). 



This shell has an oblong conic shape, is rather solid, 

 scarcely if at all translucent, and of a somewhat dull sur- 

 ace ; it is either of an uniform fulvous or rufo-fulvons 

 brown, or is yellowish white with a tawny zone near the 

 suture and base of the body-whorl, and a stain of rich 

 brown upon the inner lip. There are two principal vari- 

 ations as to sculpture, which arise from the degree and 

 extent of the characteristic decussation. In those rather 

 narrow individuals from which the species was originally 

 constituted, the body is merely ridged in a spiral direc- 



