CLIMATE OF PLEISTOCENE PERIOD. 57 



17. — (A rionta) arlustorum, Linne" ; abundant. 



18. — — — , var. 



19. — — — , var. 



20. — (Pentatcenia) nemoralis, Linne ; common. 



21. — — — , var. 



22. — — hortensis, Mull. 



23. — (Helicella) ericetorum, Mull., var. 



** 24. — (Gandidula) Badigueli, Bourgt.? ; common. 



* 25. Bulimus montanus, Drap. ; rare. 



26. Zua lubrica, Mull. 



27. Pupa (Pupilla) muscorum, Linne. 



28. — (Sphyradiuvi) doliolum, Brag. 



29. Vertigo sp. }} 



30. Clausilia (Marpessa) laminata, Mont. 



* 31. — (Iphigenia) dubia, Drap.? ; rare. 



32. — — parmda, Stud. ; abundant. 



33. — — — , var. 



34. Succinea putris, Linne, type ; rare. 



35. — — , var. 



36. — — , var. 



37. — — , var. limnoidea, Picard ; abundant. 



38. — — , var. gigantea, Baudon. 



39. — Pfeifferi, Bossm.?, var. contortula, Baudon. 

 ** 40. — joinvillensis, Bourg. ; rare. 



41. Limncea ovata, Drap. 



42. — sp. ? 



* 43. Pornatias septemspirale, Bazoum. 



** ? 44. Cyclostoma elegans, Mull., var. lutetiana, Bourgt. 1 ; abundant. 

 45. — — , opercula. 



This list shows at a glance that the molluscous fauna of La 

 Celle presents strong contrasts to that which is now charac- 

 teristic of Northern France. The number of extinct forms, and 

 of species and varieties which have emigrated, and the absence 

 of certain forms which are characteristic of the fauna now 

 occupying the same region — alike conspire, as M. Tournouer 

 remarks, to separate the fauna of La Celle from that of the 

 present day. The species are arranged by him in four groups 

 as follows : — 



1. Species still living in the district where the tufa occurs. 



