GASTEROPODA. 



139 



ranean, &c. The English species, P. puttus, is very small 

 and pretty, beautifully streaked and spotted, and very 

 plentiful at Guernsey : the largest and handsomest come 

 from Australia, and are of various shades of purple, crim- 

 son, and brown: the animal is as gaily coloured as the 

 shell, and the operculum is mostly white, convex on the 

 outer part, and spiral within. 



Turbo. Lin, — Shell rather turreted. thick, rough, or 

 smooth: base not flattened as in Trochus; 

 aperture round, and generally pearly: lips not 

 united; outer lip thin, and sharp; operculum 

 either internally horny, or shelly and solid. 

 Animal, head prolonged into a snout, having 

 two pointed tentacula, with the eyes on the 

 outside, on stalks: two frontal lobes between Turbopka. 

 the feelers: on each side of the foot three 

 filaments, frequently also a fringed membrane. — 63 

 species*: also fossil. 



The shells of the genus Turbo are many of them very 

 handsome, the greater part of the substance seeming to 

 consist of a pearly substance, which is occasionally of a 

 golden hue : exteriorly they are often spirally ribbed, 

 grooved, or quite smooth. They are principally brought 

 from the seas of warm latitudes. 



Philippi mentions as sub-genera : — Sarmaticus, Modelia, 

 Callopoma, Rinella, Collonia Gray ; Marmarostoma Sic. 



Liotia. Gray. — Shell flatly compressed, 

 umbilicated : the aperture circular, the edges 

 connected, the outer lip thick, with a regularly 

 expanded border, pearly within : operculum 



* Reeve": Iconica, 



