214 MANUAL OF THE MOLLUSCA. 
Type, T. pungens. Pl. LY., Fig. 11. 
Shell Lke murex; but having tubular spines between the 
varices, of which the last is open, and occupied by the excurrent 
canal. 
Distribution, 9 species. Mediterranean, West Africa, Cape, 
India, Western America. —d0 fathoms. 
Fossil, 8 species. Hocene—. London, Paris. 
PISANIA, Bivyon, 18382. 
Etymology, a native of (the coast near) Pisa, in Tuscany. 
Synonyms, Pollia, Hnzina, and Euthria (Gray). 
Types, P. maculosa. Pl. IV., Fig. 14 (Enzina), zonata. Pi. 
live, Hie. 15. 
Shell with numerous indistinct varices, or smooth and spirally 
striated ; canal short; inner lip wrinkled ; outer lip crenulated. 
Operculum ovate, acute; nucleus apical. 
The pisanie have been usually confounded with buccinum, 
murex, and ricinula. 
Distribution, about 120 species. West Indies, Africa, India, 
Philippines, South Seas, Western America. 
Fossil, ? species. Hocene—Britain, France, &c. 
RANELLA, Lam. Frog-shell. 
Synonym, Apollon (Montfort and Gray). 
Types, R. granifera. Pl. IV., Fig. 12. R. spinosa. 
Shell with two rows of continuous yarices, one on each side. 
Operculum ovate, nucleus lateral. 
Distribution, 58 species. Mediterranean, Cape, India, China, 
Australia, Pacific, Western America. Jtange, low-water to 20 
fathoms. 
Fossil, 23 species. Hocene—. 
TRITON, Lam, 
Etymology, Triton, a sea-deity. 
Synonym, Persona (Montfort, Gray). 
Type, T. tritonis, L. species. Pl. IV., Fig. 13. 
Shell with disconnected varices; canal prominent; lips denti- 
culated. 
Operculum ovate, sub-concentric. 
Distribution, 100 species. West Indies, Mediterranean, 
Africa, India, China, Pacific, Western America. Ranging from 
