165 



equidistant reddish brown irregularly shaped spots; 

 whorls flat, with five or six minute tuberculated spiral 

 ridges, the lower one the strongest ; apex acute, suture 

 distinct, base imperforate flat, subconcave, with nume- 

 rous concentric tuberculate ridges ; aperture nacreous, 

 compressed. 0,80. Isles of Man, Dublin, fyc. 



GENUS. TURBO. 



Conoid or subturrited, the periphery never compressed; 

 aperture entire, rounded, not modified by the penult 

 whorl, the margin disunited above ; pillar arcuated 

 flattened and not truncated at the base, an oper- 



T. LITTOREUS. Lin. 1232. List. t. 585. /. 43. 

 Lam. 24. D. p. 817. Born. t. 12. /. 13,4. Mart, 

 f. 1852. List. An. p. 162. Mont. p. 301. F. p. 

 298. Ovate, imperforated, thick, transversely striated, 

 variable in colouring, often yellowish grey often with 

 narrow bands whorls five, the separating line shallow, 

 the whorls, except the [last little convex ; outer lip 

 joining the body at an acute angle ; columella white, 

 throat chocolate brown. Variety scarlet. 0,80. Com- 

 mon Periwinkle. 



T. PETROUS. F. p. 298. D. p. 820. HELIX P. 

 Mont. p. 403, Strong conical, opaque, purplish brown, 



