NKRITINA. 47 



trifasciata, N. Ticincn*i* and .V. hrfr.rfu, Villa; rigs. 22, 23 are from 

 Central Italy, including X. pustulata, Parr., X. meridionalis, Mar- 

 tens, X. Oi'xuiii, Pecchioli ; fig. 24, from Dalraatia, is N. Dalmatiea, 

 Partsch, X. Diocletian a and N. guttata, Kiister, N. Petteri, Stentz, 

 etc.; and fig. 2-") is a South Russian form described as N. dendritica, 

 Zieglcr, .V. purpumtn, Parr., X. nbth<>.nnalis, Bourg. etc. Among 

 tin- general synonyms may be enumerated N. lutetiana, Montf., X. 

 KnrojHt'd, Leach, X. trifasciata, Menke, X. Porroi, Stabile,^. varia- 

 bilin, Ilecart, X. Bourguignati, Recluz, 7X. lacustris, Linn., X. fon- 

 tumti*, Brard, X. halophila, Klett, N. Bdttgeri, Westerl., and vars. 

 dilatata, Moquin-Tandon, and elongata, Broeck. 



X. TKAXSVKRSALIS, Ziegler. PL 16, figs. 26, 27. 



Shell obliquely transverse, slightly striulate, shining, greyish lead 

 color, usually with three narrow dark bands. Diam. 10 mill. 



Danube and tributaries, Bavaria, Austria, Hungary, Transylvania, 

 etc. 



It is X. trifasciata, Reeve, N. trizona, Zglr., and X. radiata, Lang. 



N. DORUE, Issel. PI. 16, fig. 28. 



Thin, distinctly striate, shining, blackish, with zigzag lighter 

 strigations, sometimes interrupted; aperture bluish white or yellow- 

 ish. Diam. (> mill. 



Southern Persia, in warm springs. 



N. LiTi'KATA, Eich \vald. PL 16, figs. 29, 30. 



Transverse, yellowish to olivaceous, with oblique, more or less 

 /igzag dark strigations, rarely replaced by small flecks irregularly 

 arranged in bands. Diam. 5*o 7'5 mill. 



Caspian, Aral and Black Seas. 



It is X. Danubialis, Siemaschko, N. fluviatilis, Menetries, X. ser- 

 t, Hohenacker, and X.pupa, Pallas. 



N. llKLDRKrciir, Schwer/enb. PL 16, figs. 31, 32. 



Obliquely transverse, closely, slightly striate, light violaceous or 

 Liwish, reticulated with white and purple, with three ill-defined 

 /ones; aperture purplish, yellow-margined, columellar area flat- 

 tened, minutely rugulose, bluish white. Diam. 7-11 mill. 



Asia Minor, Candia. 



N. VAULA, Ziegler. PL 16, figs. 33, 34. 



Globosely subturbinate, slightly striated, shining, yellowish olive, 

 with narrow red strigations, or white, red-bordered maculations; 



