SUPPLEMENT. 151 



lusca inhabiting the two continents would be very useful and 

 interesting. It might tend to reduce the excessive number of 

 species in this family made by our Transatlantic cousins. 



P. 41. — Axodoxta cygxea. E. Naples (Poli). 



P. 43. — A. axatixa. E. Turkey (Bourguignat). 



P. 47. — Dreissexa polymorpha. E. Denmark (Poulsen) ; 

 S. France (Moitessier and others) ; Scutari (WalderdorfF). It 

 is the Mytilus Wolgce, Chemn., and has several other syno- 

 nyms. 



P. 53. — Neritixa fluviatilis. Russia (Jelski). 



P. 56. — Paludina coxtecta. P. Forest Bed (A. Bell). 

 E. Spain (Asso,jide Graells). Yar. virescens. Bandless and 

 of a pale greenish colour. Brigg, Lincolnshire (Mr. Thos. 

 Ball). The fry are easily distinguishable from those of P. 

 vivipara. 



P. 58. — P. vivipara. F. Mewe, near Konigsberg (Beh- 

 rendt). E. Caspian Sea : probably brought down the Volga 

 (Dunker). 



P. 59. — Bythixia. Qu. Bithyxia, a province of Asia 

 Minor. 



P. 60. — B. textaculata. F. Vesuvius (Guiscardi). E. 

 Greenland (E. v. Martens). Animal in winter of a yellowish 

 chestnut-colour (Daniel). 



P. 61. — B. Leachii. Siberia (MiddendoriF, as Paludina 

 Kickxii of Westendorp) ; Amoorland (Schrenck). 



P. 63. — Hydrobia. The name of the genus of Coleoptera 

 is Hydrobius. Paludinella of L. Pfeiffer is a synonym of 

 Assiminea. 



P. 64. — H. similis. Foot double-edged in front. Yar. 

 Candida. Shell white. Woolwich (A. Bell). E. Denmark 

 (Morch) to Madeira (Watson and others); Algeria (Morelet); 

 Malta (Issel). Bythinia Baudoniana, Gassies. 



P. 66. — H. vextrosa. Orkneys (Thomas). F. Norwich 

 Crag at Braraerton (coll. Wood); Pisa (Manzoni); ? Vienna 

 basin (Homes). E. Denmark, Germany, Spain, Italy, Cor- 

 sica, and Dalmatia. Synonyms endless. Turbo stagnalis of 

 Baster is H. idvce ; Gmelin misquoted him and changed the 

 specific name to stagnorum. 



