PLATE V. 
1. Helix rysa, S. Wood. 
2. Helix suttoneusis, S. Wood. 
3. Limax modioliformis, Sandb. (a. upper surface, h. lower surface.) 
4. Paludina gibba, Sandb. {a. back. b. front.) 
5. Paludina media, Woodw. 
6. Paludina ? glacialis. S. Wood.. 
7. Valvata fluviatilis, Golb. {a. back. b. front.) 
8. Hydrobia Steinii, v. Martens. 
9. Litboglypbus fuscus, P/r. {a. side view. b. back.) 
10. Hematuna runtoniana, Sandb. {a. back. b. front view of smaller 
specimen.) 
11. Pisidium astartoides, Sandb. {a. inside, h. outside.) 
12. Corbicula fluminalis, Mull. {a. inside, b. outside.) 
