^36 Quarterly Journal of Condiology. 



occurs at all the groups east and west, though of smaller size than 

 the west coast shells. It is also said to be found at Panama, 

 Peru, W. Indies and Senegal. Hipponyxfoliaceus, " Quoy et Gai- 

 mard, Zool. Voy. Astrolabe, PI. 72, fig. 41—45," is probably the 

 same, it was obtained at Guam, where I found all the moUusca 

 of the Polynesian type. 

 July, 1877- 



ALLIANCE OF THE GENERA STREPTAXIS AND 



ENNEA. 



By J. S. GiCBONs, M.B. 



In Paetel's Catalogue Streptaxis is placed in a group with 

 Eniica, Stieptoste'e and deliaxis. Mr. Bland, from a considera- 

 tion of their teeth, &c., also places the two first together; an 

 arrangement now adopted by most conchologists. 



It is difificult to understand on what grounds Streptaxis could 

 have been linked with Helix and Ennea with Pupa. It must 

 certainly have been done in ignorance of the animals. 



The two genera {Streptaxis and Ejuiea) reseniDle each other 

 most closely in shell, animal, and habits. 



In both, the shell is of the same semi-transparent, pearly 

 lustre, allowing the retracted animal to be clearly distinguished ; 

 the shipj, too, of the shells is not dissimilar, except that in 

 Streptaxis the whorls aie not symmetrical. '1 he animal in both 

 genera is singularly alike and very diuinct from that of all others; 

 alike in shape, ahke in having the tentacles a beautiful deep ver- 

 milion color, aid in having the fott a rich chrome yellow. In 

 both the animal is quick, irritable, timid, and all the specie's love 

 to hide them.^elves under dead leaves and decaying rubbish under 

 trees and at the verge of forests. No species of either genus ever 

 suspends itself by dried mucus or attaches the aperture of its 

 sl.ell as do Pitpas and many Helices. 



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