GASTErvOPODA. 107 



Type, T. pungeus. PI. IV.. fig. 11. 



Shell like nnu-ex ; but ha\dng tubular spines between the varices, of which 

 the last is open, and occupied by the excurreut canal. 



Bistr,, 8 sp. Medit., W. Africa, Cape, India, W. America. — 50 fms. 

 Fossil, 8 sp. Eocene — . London, Paris. 



PiSANiA, Bivon, 1832. 



Etym., a native of (the coast near) Pisa, in Tuscany. 



Syn., PoUia, Enzina, and Euthria (Gray). 



Types, P. maculosa. PL IV., fig. 14 (Enzina) zonata. PL IV., fig. 15. 



Shell with numerous indistinct varices, or smooth and spii-aUy striated ; 

 canal short ; inner lip wrinkled ; outer lip crenulated. 



Operculum ovate, acute ; nucleus apical. 



The pisanice have been usually confounded \%ath huccimim, murex, and 

 ricinula. 



Bistr., about 120 sp. TV. Indies, Africa, India, Philippines, S. Seas, W 

 America. 



Fossil, ? sp. Eocene — . Brii., France, &c. 



Ranella, Lam. Frog-shell. 



Syn., Apollon, Montfort and Gray. 

 Types, R. grauifera. PL IV., fig. 12. R. spinosa. 

 Shell with two rows of continuous varices, one on each side. 

 Operculum ovate, nucleus lateral. 



Distr., 50 sp. Medit., Cape, India, China, Australia, Pacific, W. America. 

 Range, low-water to 20 fms. 

 Fossil, 23 sp. Eocene — . 



Triton. Lam. 



Etym. Triton, a sea-deity. Syn., persona (ilontf. Gray). 



Type, T. tritonis, L. sp. PL IV., fig. 13. 



Shell with disconnected varices ; canal prominent ; lips denticulated. 



Operculum ovate, sub-concentric. 



Bistr., 100 sp. W. Indies, Medit., Africa, India, China, Pacific, W. 

 America, Ranging from low-water to 10 or 20 fathoms ; one minute species 

 has been dredged at 50 fathoms. 



Fossil, 45 sp. Eocene—. Brit., France, &c. Chile. 



The great triton {T. tritonis) is the conch blown by the Australian and 

 Polynesian Islanders. A very similar sp. {T. nodiferus) is found in the 

 Medit., and a third in the W. Indies. 



Fasciolaria, Lam. 

 Etym., fasciola, a band. 

 Type, F. tulipa. PL V., fig. 1. 



