nw 
PLATE Hf. 
. Helix Lemani, in the 2d Fresh-Water Formation. 
. 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. 
. 6. Small cylindrical stems, with a channel in the centre, and divided by 
transverse partitions. 
. A body in the form of a date, with sinuous channels. 
. The ear of a plant (which may be compared to certain species of Paspa- 
lum) found in the silex at Longjumeau. 
