BIBLIOGRAPHY OF 1 87 7. 307 



B. [Fachnodus) Drake?isbe?-gensis, from the eastern slope of 

 the Drakenberg Mountains at Lydenberg goldfields, Transvaal. 

 Nearly allied to B, Nataletisis Krauss, and B . areiiicola Benson. 



Strebel (H.) — iViexican Land and Freshwater Mol- 

 lusca. — Beitrag zur Kenntniss der Fauna Mexicanischer 

 Land- und Siisswasser-Conchylien. III. Theil. 



Strobel (Prof Pellegrino).— On the Distribution of the 

 Mollusca of the Northern Slope of the Appen- 

 nines. — Intorno alia distribuzione oro-geografica dei mol- 

 luschi viventi del Tidone alia Secchia. — Bull. Soc. Mai. 

 Ital., 1877, iii., pp. 81 to 135. 



The author commences this elaborate paper by an enumera- 

 tion of the species, giving their distribution. He mentions i 

 Testacella, 4 Liviax^ i Aitialia^ 3 Vitrina. 7 ffyalhia, 2 Avion, 

 20 Helix, 4 Biilimiiius, 3 Cianella, 10 Pupa, t Balia, 7 Clans ilia, 

 3 Succinea, i CarycJiiuni, 2 Livincta, 2 Planoii>is, i each of 

 Ancylus, Acme, Cyclostoma, Amnicola, Paludinella, Unio, Anodonta, 

 Cyclas and 3 oi Pisidium. A list succeeds of species (r Hyalina, 

 6 Helix, I each of Buliminus, Stenogyra, Pupa, Clausilia and 

 Cydostojuci) which have been erroneously recorded for the district; 

 then follows a list (a Hyalina and 3 Helices) which should possibly 

 occur; and a third note records 2 acclimatized species of Helix. 

 The second part of the paper is a contrast of the faunas of the 

 northern and southern slopes of the Appenine range : the conclu- 

 sions drawn being that the more salient characteristics of the 

 northern slope are: — i. Absence of the genus Poviatias ; 2. Ah- 

 sence or extreme scarcity of the subgenus Campy Icea {Helix)-. 

 3. Presence of the western Pupa, variabilis, which here reaches 

 its extreme eastern limits; 4. Presence of Helix hispida, H. 

 ciliata, H. fruiicuni, H. pomatia and Bulinius detritus^ which here 

 find their southern limit, as also the type oi H. neuwralis; 5. The 

 fact that the northern typical form of Clausilia Comensis here 



