280 



LIFE OF THE PLEISTOCENE 



Interglacial deposits being covered in places by a lava flow and this by a later 

 ice sheet, the Wisconsin. No correlation is made of this interglacial interval 

 with the intervals of the Mississippi Valley, but it might have been coeval 

 with the Yarmouth interval, which was of long duration. 



III. SYSTEMATIC CATALOG OF THE BIOTA OF THE YARMOUTH 

 INTERGLACIAL INTERVAL 



PLANTS 



BRYOPHYTA 

 Sphagnaceae 



Hypnacae 



SPERMATOPHYTA 

 Taxaceae 



Sphagnum species 



Drepanocladus aduncus(L.) Warnst. 



Taxus canadensis Marsh 



Pinus species 



Juniperus virginiana Linn. 



Picea canadensis (Mill.) BSP. (?) 



PlNACEAE 



Picea species 



Larix laricina (DuRoi) Kch. = americana 

 " churchbridgensis Penhallow 



Elodea canadensis Mich.t. 

 Species indet. 

 Species indet. 



Lithospermum (seeds) 



Fusconaja chunii (Lea) 



" rubiginosa (Lea) 



Crenodonta perplicata (Conrad) ? 

 " undidata (Barnes) 



MONOCOTYLEDONEAE 



Hydrocharitaceae 



Vallisneria spiralis Linn. 

 Gramineae 



Cyperaceae 



DlCOTYLEDONEAE 

 Boraginaceae 



ANIMALS 



MOLLUSCA 



PELECYPODA 



Unionidae 



Pleurobema obliquum (Lam.) 



Propleta purpurata (Lam.) 

 Quadrula asper (Lea) 



" pustulosa (Lea) 



