1894.] NATrKAL SCIENCES OF PHILADELPHIA. 13 



Johnson in Fulton County, Pa. It occurs over nearly the whole 

 of eastern North America. 



Family ZONITIDJE. 



A complete rearrangement of the American genera of this family 

 is necessary, and although a local fauual list may be considered 

 hardly the place for radical changes in nomenclature, still it may be 

 preferable to the perpetuation of an untenable system. The species 

 which were formerly referred to the genus Zonites will now be dis- 

 tributed into several genera, distinguished by important structural 

 peculiarities. 



The genus Zonites of Montfort has no representative in America, 

 being confined to the circum-Mediterranean and adjacent faunas. In 

 this genus the shell is large, solid, opaque and discoidal, and is al- 

 ways strongly carinated, at least when young. The jaw has a strong 

 median projection; the genitalia lack all accessory organs, being of 

 the haplogonous type. The synonymy of the genus is as follows: 



1810. — Zonites Montfort, Conchyliologie Systematique, II, p. 282. 

 Type jET. algini L. 



1833. — ^Egopsis Fitzinger, Syst. Vers, p. 99. H. verticillus. 



1837. — Tragomma Held., Isis, p. 916. H acies Partsh. 



1847. — Helicodes Dumas, Comp. Rend., XXV, p. 113. H. algira. 



1849. — Helicella, in ])art, of Ferussac, Prodrom. and of Risso, Hist. 

 Nat. Eur. Merid., IV, p. 68 (1826), and of Beck, In- 

 dex (1837). 



1855.— Fer^t«7^»sMoq.-Tand. Hist. Nat. Moll. Fr., p. 91. Z. 

 algirus. 

 Not Zonites of American authors ! 



Genus OMPHALINA Rafinesque. 



Omphalina Raf., Enumeration and Account of some remarkable 

 Natural Objects in the cabinet of Prof. Rafinesque, in Philadel- 

 phia, p. 3. November, 1831. (Type 0. cuprea Raf.,^if. fuli- 

 ginosa Griff. ). Binney ct Bland, Land and Fresh-water Shells 

 of N. A., p. 283. 1869. Trvon, Amer. Journ. Conch., II, p. 

 247. 1866. V. Martens, Biol! Ceutr. Amer., Mollusca, p. 104. 

 1892. 



Mesomplux (in part). Beck, Index Moll. p. 7. 1838. 



Neozonitince Pffeffer, in Strebel's Beitr. Mex. Land u. Siiss-W. 

 Couch., IV, p. 1. 1880. 



Edusa Alb., Die Heliceen (2), p. 72. 1860. (Tvpe H. zonites 

 Pfr.). 



