PLATE III. 



1. Helix Lemani, in the 2d Fresh-Water Formation. 



2. Helix Menardi, in the limestone near Mans. 



Second Fresh-Water Formation. 



3. Oval grain found in the silex at Longjumeau. 



4. Cylindrical, channelled grains, found in opaque silex at Longjumeau. 



They have no resemblance to any genus now known. 



5. 6. Small cylindrical stems, with a channel in the centre, and divided by 



transverse partitions. 



7. A body in the form of a date, with sinuous channels. 



8. The ear of a plant (which may be compared to certain species of Paspa- 



lum) found in the silex at Longjumeau. 



