278 



HYGROMrA. 



glands are inserted very high, four on each side ; some distance 

 below them are two dart sacks, with two accessory sacks, the latter 

 containing no darts. Penis, etc., as usual in the genus. The geni- 

 tal system of H. unidentata is the same as in leucozona. 



A group of Middle Europe, in which the shell has much similar- 

 ity to Dibothrion, but the genitalia are as in Fruticicola hispida, etc. 



H. unidentata Drap., iii, 171. 



cobresiana Alt., iii, 171. 



monodon Fer. 



mike Miihlf. 



ventricosa Jan. 

 /. anodonta Tschap. 

 /. alpestris Cl. 

 /. subleucozona Fag. 

 H. edentula Drap., iii, 171. 



depilata Drap. 



liminifera Held. 



H. leucozona Zgl., iii, 171. 

 coadvnata, Z. 



/. delopida Jan. 



/. crassilabris Miihlf. 



/. rutilans Z. 

 modesta Parr. 



v. ovirensis Rm., iii, 172. 



v. heteromorpha W., iii, 172. 



v. erjaveci Cless., iii, 172. 

 H. bielzi Schm. 



v. bosnensis Mlldff. 



Section Dibothrion Pfr., 1855. 



Petasia BECK, Index, 1837, p. 21. MARTENS, Die Hel., 1860, p. 

 102, type H. bidens. Not Petasia Serv., 1821 (Orthoptera) of 

 Steph., 1829, (Lepidoptera) or of Morr. 1829, (Polyzoa). Trochiscus 

 HELD, Isis, 1837, p. 915. Not Trochiscus Heyden 1826, (Arach- 

 nida). Dibothrion PFR., Mai. Bl. 1855, p. 128 (for bidens and 

 bicallosa). 



Shell subtrochoidal, with convex-subconic spire of numerous nar- 

 row ichor Is, and closed or nearly closed umbilicus; arcuate-striate, 

 translucent brown with light peripheral band. Aperture basal, 

 narrow ; lip well expanded, reflexed, with two strong internal teeth 

 or nodules on the basal margin, marked by pits behind the lip; 

 parietal wall toothless. Type H. bidens, pi. 55, figs. 25, 26. 



Geuitalia (pi. 70, fig. 41, H. biden*) : Dart sack single, cylindrical 

 and rather large ; two mucus glands on each side. Other organs as 

 in Hygromia generally, except that the spermatheca duct is unusu- 

 ally short. Dart needle-like, with four short blades at the point. 



Distribution, eastern Europe and Siberia. 



