PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 511 



Formation and locality. — Miocene (?) Tertiary strata, Bridge Creek, Or- 

 egon. Collected by Prof. Thomas Condon. 



41. Ehamnus parvifolius, n. sp. 



Leaves sliort-])etioled,2 to 3 inches long, elliptical or obovate, rounded 

 at the summit, narrowed to the ])etiole below ; margins dentate, except 

 at base ; teeth coarse, acute, appressed near the summit; nervation uni- 

 form, rather open, six to seven branches on each side of the midrib. 



Formation andlocaliti/. — Tertiary strata, associated with Flatanns Ray- 

 noldsii, &c., valley of Yellowstone Eiver, Wyoming. Collected by Dr. 

 Hay den. 



42. LAURUS acuminata, 11. sp. 



Leaves about 40 millimeters in length by lO millimeters wide ; long- 

 ovate or ovate-lanceolale in outline, rounded at the base, long-pointed, 

 acuminate at summit; nervation camptodrome; midrib straight, strong, 

 about five pairs of lateral nerves, strongly arched upward, forming fes- 

 toons near the margin; the lower pair opposite strongest, and reaching 

 the middle of the leaf; secondary nervation oi)en, forming irregular, 

 chiefly quadrangular spaces, filled with minute uniform areoles. 



Formation and locality. — Yellowstone Valley, Wyoming. Collected 

 by Dr. Hayden. 



43. Viburnum G^RANDIDENTATUM, n. sp. 



Leaves ovate (?) long-pointed, very coarsely dentate, with triangular 

 teeth ; nervation fine, lateral branches terminating in the marginal 

 teeth ; the lowSr pair reaching above the middle of the leaf and throw- 

 ing oft' branchlets, which enter the marginal denticles. 



Formation and locality. — Tertiary strata. Tongue River, Wyoming. 

 Collected by Dr. Hayden. 



44. Viburnum cuneatum, n. sp. 



Leaves petioled, long-obovate, 10 centimeters or more in length by 

 4 centimeters in width ; margins entire below the middle, above, set 

 with coarse subacute or acute teeth ; nervation strong, simple ; midrib 

 straight, giving off at an acute angle 7 or 8 simple, strong nerve branches 

 on either side, which terminate in the teeth of the margin. 



Formation and locality. — Tertiary beds. Tongue River, Wyoming. 

 Collected by Dr. Hayden. 



45. Viburnum paucidentatum, n. sp. 



Leaves petioled ; 4 inches long by 1^ inches wide ; ovate-lanceolate, 

 pointed ; narrowed and slightly rounded at base ; margins below the 

 middle entire, above bearing three large obtuse teeth; nervation strong, 

 simple; midrib straight, about 4 strong, simple branches on either side 

 of the midrib, issuing at an acute angle, the lowest terminating in a 

 rounded tooth in the middle of the leaf, the others in the three large 

 teeth above. 



