214 MAinJAL OF THE MOLLUSCA. 



Tijpe, T. pungens. PL IV., Fig. 11. 



Shell Wq murex; but having tubular spines between the 

 varices, ol' which the last is open, and occupied by the excurrent 

 canal. 



Bistrihution, 9 species. Mediterranean, West Africa, Cape^ 

 India, Western America. — 50 fathoms. 



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



PiSAiiiA, Bivon, 1832. 



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



Synonyms, Pollia, Enzina, and Euthria (Gray). 



Types, P. maculosa. PI. IV., Eig. 14 (Enzina), zonati. PI. 

 IV., Fig. 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 pisaniod have been usually confounded with huccinum, 

 murex, and ricinula. 



Distribution, about 120 species. West Indies, Africa, India, 

 Philippines, South Seas, Western America. 



Fossil, ? species. Eocene — Britain, France, &c. 



Eanella, Lam. Frog-shell. 



Synonym, Apollon (Montfort and Gray). 



Types, E. granifera. PL IV., Fig. 12. E. spinosa. 



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



Operculum ovate, nucleus lateral. 



Distribution, 58 species. Mediterranean, Cape, India, China, 

 Australia, Pacific, Western America. Range, low-water to 20 

 fathoms. 



Fossil, 23 species. Eocene — . 



Teiton, 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. Eanging from 



