PLANTS PREVIOUSLY DESCRIBED. '.I'M 



of the teeth and their inclination to the midrib, the fossil corresponds most 

 closely with P. anserina, to which I therefore refer them. At present this 

 species is very abundant along the eastern coast and on the margins of rivers 

 and lakes throughout the interior and as far north as the Arctic sea. 



GAYLUSSACIA RESINOSA, TORR. AND GRAY. 



A well-preserved leaf in a nodule. This shows the form of the leaf, and 

 the resinous dots are so perfectly seen as to render it readily determinable. 

 This species is now found in rocky or sandy woodlands and in bogs, from 

 Newfoundland and Nova Scotia to the Saskatchewan. 



POPULUS BALSAMIFERA, L. 



The material representing this species is embraced in leaves and fragments 

 of branches contained in nodules. The former are in most cases well pre- 

 served and admit of easy identification. As noted in the original descrip- 

 tion, however, the leaves are all small, and assuming them to be mature this 

 would indicate a cold climate or very exposed situations. At present P. 

 balsamifera is of very wide distribution throughout Canada, extending north- 

 ward to the mouth of the Mackenzie river, where it attains large size, and is 

 an important source of fuel (Macoun). 



POTAMOGETON PERFOLIATUS, L. 



Portions of leaves and seeds in nodules. The venation is beautifully dis- 

 tinct, and it is without much doubt referable to the species named. This is 

 one of our most common water weeds, being found everywhere in the streams 

 of the northern United States and Canada. 



POTAMOGETON PUSILLUS, L. 



This is one of the most abundant plants contained in the uodules from 

 Green's creek. The specimens all show a branching plant with narrow 

 leaves. This species is now common in slow streams and ditches almost 

 everywhere. 



ilnUISETUM SCIRPOIDES, MICHX. 



Common in the nodules from Green's creek, and associated with Potentilla 

 anserina. This is a widely distributed species, and would naturally occur 

 among such plants as are found at the above locality. 



There is also another nodule containing a portion of a stem cut longitu- 

 dinally. It has the appearance of an Equin turn, ami may possibly be re- 

 ferred to one of the larger species, such as E. palmtre or El litnomm. 



ORYZOPSIS A9PERIFOLIA, MICHX. 



A fragment of a leaf and stem in a nodule, showing features which make 

 them correspond closely with Oryzopm asperifolia, and to which I therefore 



