Drift Series. 
Shells. 
A I. 
This Case contains specimens of land, fresh-water, and marine 
shells, from the base of the loess at Menchecourt, in the valley 
of the Somme, France. 
LAND SHELLS FROM THE PLEISTOCENE FLUVIO-MARINE SAND (SABLE AIGRE) 
OF MENCHECOURT, NEAR ABBEVILLE, CONSISTING OF 
1. Limax agrestis 5. Helix 
2. Helix arbustorum 6. pulchella 
3. Vitrina pellucida 7. ,, pygmoea 
4. Pupa muscorum juv ? 8. Cyclostoma elegans 
FRESH-MTATER SHELLS FROM THE SABLE AIGRE OF MENCHECOURT. 
9. Lymnsea limosa 16. Bithynia ventricosa 
ID. ,, palustris 17. Valvata piscinalis 
11. Velletia lacustris 18. cristata 
12. Planorbis carinatus 19. Cyclas rivicola (?) 
13. ,, spirobis 20. ,, cornea 
14. vortex 21. Pisidium pulchellum 
15. Bithynia tentaculata 
MARINE SHELLS FROM THE SABLE AIGRE OF MENCHECOURT. 
22. Buccinum undatum 25. Tellina solidula 
23. Litorina rudis 26. Hydrobia marginata 
24. Litorina 
The following land and fresh-water shells are exhibited from 
the loess of Fisherton Anger, near Salisbury. 
FRESH-WATER SHELLS. LAND SHELLS. 
Ancylus fluviatilis Succinea putris 
Lymnsea palustris ,, elegans 
,, limosa ,, oblonga* 
Planorbis spirobis Helix arbustorum 
carinatus ,, nemoralis 
Bithynia tentaculata ,, pygmoea 
Valvata piscinalis , , pulchella 
Pisidium fontinale ,, hispida 
,, pulchellum var. (Jenyns) var. concinna 
,, pusillum rotundata 
,, obtusale ,, fulva 
Pupa muscorum 
Zua subcylindrica 
* This is the only shell not found at present in this neig hbourhood. 
