MARYLAND GEOLOGICAL SURVEY 485 



Occurrence. — Calvert Formation. Good Hope Hill Road, 

 Collection. — Maryland Geological Survey. 



Genus CAESALPINIA Linne. 



Caesalpinia ovalifolia n. sp. 



Description. — Leaf very small, about 7/20 in. long by 3/20 in. 

 maximum width, ovate-laceolate, slightly unsymmetrical, entire, taper- 

 ing to an acute tip and to a somewhat rounded base, very short petioles ; 

 midrib slightly curved; secondary nerves forming acute angles with the 

 midrib and curving upward. 



This specimen apparently represents a leaflet of some compound 

 leguminous leaf and it may be compared with a number of fossil forms 

 described under the genera Leguminosites, Caesalpinia, etc. It resembles 

 C. townshendi, Heer (Fl. Tert. Helvet., vol. iii (1859), p. iii, pi. cxxxvii, 

 figs. 26-37) especially fig. 9, 1. c. 



Occurrence. — Calvert Formation. Good Hope Hill Road. 



Collection. — Maryland Geological Survey. 



Order ANACARDIACE^. 



Genus RHUS Linne. 



Rhus milleri n. sp. 



Description. — Leaves small, broad, about 9/10 in. long by 4/5 in- 

 maximum width, irregularly lobed; lobes short, rounded or bluntly 

 wedge-shaped ; apex broad and obtuse ; base rounded or cuneate ; midrib 

 somewhat curved; secondary nerves slender, slightly flexuous, forming 

 obtuse angles with the midrib, the principal ones extending to the 

 extremities of the lobes, the upper ones to the margin, the lower ones 

 and others of intermediate rank apparently thickening out and anastomos- 

 ing. 



This species is one of the commonest in the locality where found. It 

 closely resembles the leaflets of R. mysurensis Heyne, from the East 

 Indies and also small forms of E. toxicodendron L., both of which are 

 living species. There does not seem to be any recognized fossil form 



