with Descriptions of New Species of Fossil Plants. I". 



orbicular or obovate, shortly mucronate, lateral ones longer, sabu- 

 late, terminating in awn-like points; larger branches naked, or 



bearing closeJy-appressed, linear, scale-like leaves. 



This is a very distinct and beautiful species, presenting marked 

 differences from any known living or fossil members of the 

 genus. 



Its most remarkable character is its slender and graceful 

 habit, and the separation of the pairs of leafy branchlets along 

 the naked and slender branch. The leaves too aiv less crowded 

 than in most other species, and the lateral ranks a're prolonged 

 into acute awn-like points; all of which must have given it an 

 aspect considerably unlike that of any species hitherto 

 described. 



I am not aware that a true Thuya has before been found 

 fossil. Thuites Salicornoides (Ung. Chlor. Prot. Taf. 2, fig. 1. 

 Taf. 20, fig. 8), is regarded by Endlicher and Heer as rather a 

 Zibocedrus, to which it certainly seems, from the figures and 

 descriptions given of it, to be more closely allied. 



Formation and Zoccd.it]). Miocene Tertiary beds. Fort 

 Union, Dacotah. (Dr. Hayden.) 



Glyptostrobiis Europaeus (Brong.) 



Branches slender, bearing many branchlets; leaves of two forms, 

 one short, thick and appressed, the other longer (\ Inch), slender, 

 divergent, acute, the shorter form carinated, the longer l< 

 tinctly, if ever so ; male catkins small, terminal, globular, comp 

 of a few shield-shaped scales; fertile cones larger, ovoid in form, 

 scales narrow, wedge-shaped at base, at summit expanded, semi- 

 circular, with waved or crenate margins, the dorsum of each m 

 or less distinctly marked with 10-12 acute, radiating carinas. 



One of the most interesting plants of the European M 

 the Glyptostrobus, first discovered by Brongniart, and 

 quently fully illustrated in the magnificent work of Prof. 

 Heer (Flora Tertiaria Helvetia-). Thegenufi is now onlj I 

 resented on the earth's surface by 9. heUrophyUui and <, , 

 dulus of China, but during the middle TertUu 

 widely spread over both hemiapl M of the i 



