FRESHWATER SHELLS. 



these elegant little mollusks, which feed on the mosses clothing 

 the Swiss trees and rocks, and live chiefly in sunny dry locali- 

 ties, are now very abundant. Two species of Pupa (P. acumi- 

 nata, Kl., and P. Buchwalderi, Grep., fig. 200) occur at Vermes 



Fig. 197. Fig. 198. Fig. 200. Fig. 203. Fig. 204. 



Fig. 199. Fig. 201. 



Fig. 202. 



Fig. 197. Melania Escheri, Brogn. a, from the Michelsberg near Ulm ; 

 b, from the lignitic marls of Kapfnach. 



Fig. 198. Limnceus pachygaster, Th., from Veltheim. 



Fig. 199. Cyclas Escheri^ K. May., from Schrotzburg. 



Fig. 200. Pupa Buchwalderi) Grep., enlarged three times, from Dels- 

 berg. 



Fig. 201. Helix Ramondi, Br. 



Fig. 202. Helix sylvestrina, Ziet., from Delsberg. 



Fig. 203. Planorbis solidus, Th. 



Fig. 204. Clausilia maxima, Grat., from between Ferrach and Riiti. 



and Tramelan; and a very large Clausilia (C. maxima, Grat., 

 fig. 204) has been obtained at various places, as in the marl of 

 Baretschweil, between Ferrach and Riiti, and near Unterdevelier, 

 where a second large species (C. antiqua, Schiibl.) also occurs. 

 The latter resembles a Javan, and the Clausilia maxima is like 

 a Chinese species (C. shanginensis, Pfr.). 



Freshwater mussels and pond-, mud-, and marsh-snails (Ano- 

 donta, Unto, Cyclas, Planorbis, Limnaus, Paludina, and Neri- 

 tina) were very generally distributed in the rivulets and lakes of 

 the Swiss Miocene country. Two of the species (Neritina fluvi- 



B 2 



