520 Descriptions of the Fossil Plants 



fectly preserved, and can hardly be regarded as sufficient 

 to determine, beyond a question, the identity of strata 

 found at localities so remote from each other. 



This is the plant figured by Prof. Dana in the Geol- 

 ogy of the United States Exploring Expedition. (Atlas, 

 PL 21, fig. 15.) 



Formation and locality. Miocene strata, Birch Bay, 

 W. T. 



Rhamnus Gaudini ? Heer. 



A single specimen of what may be this species is con- 

 tained in the collection of the United States Exploring 

 Expedition, made by Prof. Dana, and figured in the Atlas 

 accompanying his geological report (PI. 21,figs.ll and 12). 



It is not sufficiently well preserved, however, to make 

 its accurate determination possible. 



Formation and locality. Miocene tertiary strata. Birch 

 Bay, W. T. 



Smilax cyclophylla Newb. 



Desc. Leaves circular or round, ovate, cordate, or 

 slightly peltate at base, five-nerved, central and interior 

 pair of lateral nerves strongly marked, basilar pair deli- 

 cate, and scarcely reaching the middle of the leaf; second- 

 ary nervation forming a polygonal net-work more or less 

 rectangular. 



Unfortunately, the only specimen of this plant which I 

 have is that collected by Prof. Dana, and figured in his 

 Geology of the United States Exploring Expedition, Atlas, 

 PI. 21, fig. 10, and is imperfect, the upper part of the leaf 

 being wanting. So far as its outline is indicated by the 

 part which remains, it would seem to have been nearly 

 orbicular. If such was the case, it resembled in general the 

 aspect leaves of S. orbicularis, Heer, (Tert. Flor. Helvet. 3, 

 S. 167, Taf. CXLVII. figs. 18, 19,) and perhaps as much 

 those of the living S. rotundifolia. 



From (S. orbicularis it differs, however, in the shortness 



