PILEOLUS. 241 



from the East and West Indies ; fossil species are found in the 

 ■ Tertiary beds. The genus Onustiis, Humphreys, has for its type, 

 Phorus Indicus, a very thin species, with the margin of the 

 body whorl extending in a broad keel at the angle. PI. xvi. 

 fig. 360. 

 PHOS. Montf. Fam. Purpurifera ? Lam. — Bescr. — Turrited, 

 ^ thick, cancellated, varicose ; spire pointed, generally longer than 

 .the aperture ; aperture rounded or oval ; outer lip having in- 

 ternal ridges, with a sinus iiear the anterior termination ; co- 

 lumella with an oblique fold ; canal short, forming externally a 

 raised varix. — Obs. The raised external surface of the canal, 

 brings this genus near to Buccinum, while, in general appear- 

 ance, most of the species more resemble Murex. They have, 

 however, no true varices on the whorls, but merely raised bars. 

 PI. xvi. fig. 416, P. senticosus. 

 PHTLLIDIANA. Lam. A family belonguig to the first sec- 

 tion of the order Gasteropoda, Lam. The genera belonging to 

 this family may be distinguished as follows : 



1. Chito]!?. Composed of eight valves ; valves contingent. 



Pig. 227. 



2. Chitonellus. The same, with the valves distant. Pig. 228. 



3. Patella. Conical, symmetrical. Pig. 229, 230. 



4. Patelloida. Difiering from Patella in the animal. Pig. 



231. 



5. SiPHONABiA. "With a siphonal scar on one side. Pig. 231*. 



6. ScxiTELLA. Siphonal scar nearer to the side of the head. 



Pig. 510, 511. 

 PHYLLONOTTJS. Sw. A sub-genus of Murex, thus described : 



" Canal moderate ; varices foliated, lacioiated, compressed, or 



resembhng leaves ; inflatus. Mart. 102, fig. 980, eurystoma. 



Zool. 111. ii. 100. imperiahs. lb. pi. 109." Sw. p. 296. 

 PHTSA. Drap. A genus formed for reversed species of Limnaea, 



Auct. P. castanea. PL xiv. fig. 310. 

 PHTSETEE. Humph. Solarium, Lam. 

 PILEOLUS. Cookson. {A little cap^ Fam. Neritacea, Lam. 



— Bescr. Patelliform, with the apex sub-central, straight. In 



B 



