BIBLIOGRAPHY. OF 1876. 225' 



Clessin (S.) — Helix tenuilabris still living in South 

 Bavaria. — Helix tenuilabris Braun, in Siidbayern lebend 

 vorhanden. — Nachrichtsblatt d. Deuts. Mai. Ges., May 1876, 

 viii. pp. 67, 68. 



Clessin (S.) — Note on Helix ammonia Schmidt, from 

 Upper Italy. — Nachrichtsblatt d. Deuts. Mai. Ges., April 

 1876, viii. p. 56. 



Clessin (S.) — Observations on the German species of 

 Planorbis. — Bemerkungen iiber die deutschen Arten des 

 Genus Planorbis Guett. — Jahrb. Deuts. Mai. Ges., 1876, iii. 

 pp. 262 to 275. 



Planorbis voriiculus Trosch. and charteus Held. ; P. vortex L.; 

 P. contortiis L. and dispar West. \ are the subjects of this notice. 



Colbeau (Emile). — List of Land and Freshwater Mol- 

 lusca of Walcourt in Belgium. — MoUusques terrestres 

 et fluviatiles vivants du Canton de Walcourt. — Bull, des 

 Seances, Soc. Mai. Belg. 1876, pp. Ixiii to Ixvii. 



The canton is situated in the drainage basin of the river 

 Sambre. The list includes i Arion, 2 Limax, 4 Siiccinea, i 

 Zo7tites, 12 Helix, 2 Bu limns, 3 Clausilia, 2 Pupa, 2 Planorbis, 



1 Physa, 4 Li7nn(za, 2 Ancylus, i Bythinia, i Neritina, i Anodonta, 



2 Unio, 2 Pisidiufn and i Cyclas. 



Dybowski (W.) — Gastropod-Fauna of Lake Baikal. — 



Die Gasteropoden-Fauna des Baikal-Sees. — Mem. de I'ac. 

 imp. des Sciences de St. Petersb. VII. Serie, tome XXII. No. 8, 

 73 pages and 8 plates, 4to. — Reviewed by Dr. E. von Martens, 

 jahrb. d. Deuts. Mai. Ges., April 1876, iii. pp. 181 to 184; 

 also by W. H. Dall, Proc. Best. Soc. Nat. Hist. 1876, xix. 

 pp. 43 to 47. 



In the original paper M. Dybowski treats of a number of new 

 and interesting forms from Lake Baikal, and proposes several 'new 

 genera and subgenera, viz. : — Benedictia, for a new species, B. 



J.C. ii., August, 1S79. HI 



