1894.] NATURAL SCIENCES OF PHILADELPHIA. 15 



individuals from different localities were examined and found to 

 agree in the characters described. 



Genus VITREA Fitzinger. 



(1817. — Not iZ7/«7ma Schumacher, Syst. Vers. Test., p. 234, belongs 



to Marginellldie). 

 1819. — S. g. Helicella, Les Aplostomes, ^^'^ Les Hyalines, Hyalime, 



Ferussac (includes the European translucent zonitoids 



and many exotic species of various genera). 

 (1820. — Not Hyalina Studer, Syst. Verzeich. Schweiz Conch., p. 



11, = Vitn'iia Drap. 1805). 

 18oo. — Fi^rea Fitzinger, Syst. Verzeich., p. 99. 

 IS^S.— Oxi/chilas Fitz. , I.e., p. 100, in part, not O.vycheila Dejean, 



1825. 

 1837. — HyaUnia Agassiz, in Charpentier, Nouv. Mem. Soc. Helv. , 



i., p. 13. 

 1837. — Pollta Held., Isis,p. 910 (proposed for ce^^ciHa Miill., glabra 



^i\\([., ititensWxch.., mt'nhda Fir., lackla Dr., nitidosa 



Fer., dara Held., leidlralaris Held., crystaUina Mull., 



Jixjallna Fer., coidorta Held.,/((foa Miill. ). 

 1854. — Lucilla Lowe, Proc. Zool. Soc. Lond. , p. 177, type i?! cel- 



laria, ]Mull. 

 1854. — Crystidlus Lowe, Proc. Zool. Soc. Loud., p. 178, type H. 



crystaUina^ Miill. 

 1855. — ^;jW.o/;(aMoq.-Tand. Hist., Nat. Moll. France, IT, p. 72. 



(Includes nUidas, oliveforaiii, lucidus, cellariiix, g/aber, 



alii trills, nitidalKS, nitenx, driatalas, pur as, erystalliiias). 

 1857. — Euhyalina Albers, Malak. Blatter, IV, p. 91, type H. cel- 

 lar ia. 

 1879. — Aegopina Kobelt, Icouogr. Eur. Landund Siisswasser 



Moll., VI, p. 15 ( proposed as a substitute for ilfe8o«i-/>M(-' 



of European authors, not of Rafinesque. Type H. 



(diretorum Gm. ). 

 ISSd.—Diaphanella Clessin, Mai. Bl. (n. F.), II, p. 206, type H. 



diaphava Stud. 

 1880. — Mediterranea C\^sm\, I. c. type JZ. hydatiiia Kostim. 

 1886. — Hydatiiiu Westerlund, Fauna, etc. , p. 37, type H. hydaiiiia 



Rossm. 

 1886. — Aiiomphala West., /. c, p. 29, types parthenicn and 



diaphatia. 

 1891.— F/^rm Fitz., E. A. Smith, Journ. of Conch., VI, p. 337, 



339. 

 18^)2.— GlyphyaUiiia Martens, Jiiol. Cent. Amer., Mollusca, p.ll7. 



(H. indeidata Say, etc.). Zonites of many authors, not of 

 Montfort. 

 This genus consists of small glassy zonitoid snails having no ac- 



