160 SUPPLEMENT. 



resemblance of the shell, when floating on the surface of the 

 water, to " une petite bulle d'air transparente." 



P. 233. — B. acutus. E. Near Nykjobing, Jutland; pro- 

 bably introduced (Mbrch); Malta (Issel); Alexandria (E. v. 

 Martens). 



P. 235. — B. montanfs. E. Ural Mountains (Middendorff) ; 

 Sweden (Zetterstedt) ; Belgium (Colbeau) ; S. France (De 

 Brebisson) ; Catalonia (Graells) ; Tuscany (Pecchioli, /. Gen- 

 tiluomo). 



P. 237. — B. obsctjrus. E. Algeria (Bourguignat). 



P. 243. — Pupasecale. E. Capri I.(Philippi); Sicily (Cal- 

 cara) ; Madeira (Watson). 



P. 245. — P. ringens. Banff (Edward); Dingwall (Bucha- 

 nan White); Cheshire (Webster). L. Pfeiffer does not seem 

 to have known the synonymy of this species. 



P. 246. — P. ijmbilicata. E. Madeira (R. T. Lowe and 

 others) ; S. Abyssinia (Henglin, /. E. v. Martens). P. an- 

 conostoma, Lowe. 



P. 249. — P. emarginata. E. U.S., as P. badla of Prof. 

 Adams. 



P. 253. — Vertigo antivertigo. E. Kiev, Kussia (Jelski) ; 

 Sicily (Calcara and others). 



P. 255. — Y. Moulinsiana. F. Cambridge (Dewick). E. 

 Honneby, Sweden (Westerlund, as V. modesta afterwards V. 

 Lilleborgi); Lake Fuurso, Denmark (Morch) ; Frankfort (Hey- 

 nemann, as V. ventrosa); Berne (Lischke); Tirol (Gredler): 

 Sicily (Benoit). 



P. 257. — Y. ptgm^a. E. Lapland (Nylander). 



P. 259. — Y. alpestris. E. A moorland (Schrenck) ; Swe- 

 den (Lindstrbm and others); Bonn (Lischke) Tirol (Gredler). 



P. 261.— Y. substriata. Banff (Edward) ; Perth (Bucha- 

 nan White); Went Yale, Yorkshire (Ashford). E. Denmark 

 (Feddersen and others), and various parts of Germany. 



P. 263. — Y. ptjsilla. E. Lapland — Sicily. 



P. 265. — Y. angustior. Milford, Yorkshire (Blackhouse). 

 E. Russia, Sweden, Denmark, Belgium, N. Italy, Transyl- 

 vania, and Dalmatia. V. vertigo, Issel. 



p. 268. — Y. edentula. E. Dalmatia (Brusina) ; Madeira 



