with Descriptions of New & 



and the marginal serration of. Mhamnus is rarely il ever 



coarse as in the plant before ns. 



In ZiztjpJiuswe have a similar nervation ; and not a dissimilar 

 style in Celtis, but in neither of these have we such marginal 

 teeth. In Viburnum, however, we ha v.' some exan 

 leaves exhibiting a closer resemblance to the fossils than any I 

 have cited above, as in Viburnum erosum. Thumb", from 

 Corea, and V. odotaiiissimum of Japan. In both these plants 

 we find leaves with a great development of the basilar pair of 

 nerves, and a coarse, acute, and regular dentation of tin- 

 margin. 



Formation and Locality. Miocene beds. Fort Union, 1 

 cotah. (Dr. Hayden.) 



A I mis serrata (n. sp.) 



Leaves oval or elliptical, slightly coi'uate at the base, rounded <t 

 sub-acute at summit; margins serrate throughout, serrations fine, 

 sharp and appressed below, coarse and double above; nervation 

 pinnate, strongly marked; basilar pair of lateral nerves Bhort and 

 simple, upper ones branched near the extremities. 



These leaves have nearly the form of Afoivs I\ 

 Ung. (Chloris, Prot. Taf. 33, figs. 1-6), and a nervation simi- 

 lar in kind but more crowded. The marginal serration 

 coarser. 



Formation and Locality. Miocene strata. Banks of V 

 lowstone River. (Dr. Hayden.) 



Planera microphylla (n. Bp.) 



Leaves very small, ovate-lanceolate, generally ansymnn 

 curved or falcate, cordate at base, pointed but rarelj 

 coarsely and bluntly toothed; nervation stron 

 diverging at an angle of about 50° in 5-6 pairs brai 

 the summit, and inosculating along the mar 

 strong, leaving the second nearly al righl 



branched and anastomosing to form a i tf»d irregular 



work. 



In its general form this leaf lias a Btrik 



