(67) 



monocotyledonous, probably Araceous spathe from the Da- 

 kota Group of Kansas. In all probability Ilollick's specimen 

 is of the same species. It is doubtfully a species of Arisacnm, 

 however, and might equally be a cycadaceous spathe. In 

 appearance the specimen before us is very similar to some of 

 Lesquereux's figures of Dammaritcs (Fl. Dak. Gr. fl. i. f, 

 g-ii) ; the fine lining is about .5 mm. apart as in the existing 

 Diwimara robtista Moore of Australia, but the texture is very 

 thin and quite the opposite of the thick coriaceous leaves of 

 Dammar a and Dammaritcs. 



Arisaema (?) Mattewanense HoUick. 



Arisacjna Mattewanense Hollick, Trans. N. Y. Acad. Sci. 

 16: 130.//. 12./. 7. 1897. 



Provisionally so referred by Dr. Hollick, as the fruit of 

 some Araceous plant. 



SALICACEAE. 



Salix Linn. Sp. PI. 1015. 1753. 



The willows are all extremely rapid growers and thrive in 

 the wettest soil ; they are thus apt to occur in localities favor- 

 able for fossilization. There are about 160 existing species 

 widely distributed throughout the northern hemisphere and 

 arctic zone, a few in the southern hemisphere ; about 80 are 

 American. There are about 46 fossil American species dis- 

 tributed as follows: Raritan 5, Island Raritan 4, Dakota 11, 

 Woodbine i, Montana 3, Vancouver 2, Laramie 4 ( ?), Ft. 

 Union i, Green River 5, Eocene 7 (?), Eolignitic 3, Tertiary 

 2, Miocene 5, Pleistocene i (?). 



Heer records three from the Island of Sachalin and seven 

 from the Tertiary of Greenland. 



Salix proteaefolia flexuosa (Newb.) Lesq. PI. 4S./. 

 12; pi. 52./. 2. 



Salix jlexuosa Newb. Ann. Lye. N. Y. 9: 21. 1868; 111. 

 Cret. & Tert. PL //. /./. 4. 1878; Later Ext. Fl. 56. 

 fl. 2./. 4; -pi. rj./. J, 4; //. 14./. I. 1S98. 



