VITRINA. 141 



Y. ELONGATA, Drap. PI. 30, figs. 3-5. 



Much depressed, very thin, smooth, shining, yellowish hyaline; 

 whorls scarcely 2, the last wide, the aperture wide, depressed, 

 nearl} T horizontal. Diam. 4-3, alt. 1-3 mill. 



Germany, France, Catalonia. 



The synonym}- includes F. semilimax, Fer. ; Testacella Ger- 

 manise, Oken ; Limacina vitrea, pf, Hartm. 



Y. BREVIS, Fer. PL 30, figs. 6, 7. 



Depressed, thin, striatulate, shining, pellucid, greenish white ; 

 whorls 3, the last large ; aperture oval, sub truncate. 



Diam. 5-3, alt. 2-3 mill. 



Germany, Carinthia, Tyrol. 



Very similar to the preceding species, but shorter, and sub- 

 truncate on the outer margin. Pfeiffer and others at first 

 considered it a variety of F. elongata which it probably is. 

 Bottger has recently described a varietj- Bosniaca, from Bosnia. 



Y. G^EOTIFORMIS, Pollonera. PI. 30, figs. 8-11. 



Depressed, elliptically auriform, slightly convex above, planu- 

 late below ; colorless, whorls 2, rapidly increasing ; aperture 

 subhorizontal, oval, subtruncate in front, outer lip arcuate, 

 columellar margin membranaceous, strongly arcuate, permitting 



a view of the spire. Length, 4-5 mill. 



Aosta, Savoy. 



Yery distinct in its narrow columellar side, showing the 

 volutions from below. 



Un figured Species. 



Y. PENCHINATI, Bourg. French Pyrenees; Spain. 



Y. MEMBRANACEA, Koch. Tyrolexe Alps. 



Like F. diapliana but exceedingly thin and membranaceous. 

 Y. TRUNCATA, Bottger (Allied to F. brevis]. Carniola. 



Y. KOTUL^E, Westerlund (Allied to F. elongata). Galicia. 



Section PHENACOLIMAX, Stabile, 1859. 



Y. PELLUCIDA, Miiller. PI. 30, figs. 12-16. 



Subglobose, somewhat smooth, pellucid, greenish hyaline ; 

 whorls 3, rapidly enlarging, somewhat convex, the last wide and 



