204 THE POTOMAC OR TOUNGEE MESOZOIG FLORA. 



PHYLLOCLADOPSIS, gen. nov. 



Leafy stems branching copiously and irregularly ; leaves small, oppo- 

 site, very thick, of varying sizes on the same branch, varying a good deal 

 in shape, broadly ovate, broadly elliptical or orbicular, broadest at base, 

 abruptly narrowed into a short slightly twisted pedicel, obtuse to sub- 

 acute, terminal leaflet of the twigs like those lower down ; nerves usually not 

 distinct, being inunersed in the thick leaf-substance, radiating palmatel" 

 from a common point at base, and forking once or twice. 



This genus is quite rare in the Potomac flora, and as yet shows only 

 one species. Its character and place can not be fixed positively from the 

 small amount of material found. It is strikingly like PhyUodadus in many 

 respects. In some features it resembles Nageiopsis, but the nerves have a 

 different character. The genus is provisionally formed and named from 

 the resemblance to PJn/Hodaclits. 



PhYLLOCLADOPSIS IIETEROPHYLLA, Sp. nOV. 

 Plate LXXXIV, Fig. 5 ; Plate CLXVII. Fig. 4. 



Plant with the generic character, having the terminal leaflet of the 

 twigs much larger than those next below, and in shape ovate-obtuse ; leafy 

 branches keeled. 



Locality: Fishing hut above Dutch Gap Canal; rare. 



FEILDENIOPSIS, gen. nov. 



Leaves linear-oblong, svxbspatulate, tapering gradually below to a 

 broad petiole-like base, mode of attachment not seen ; leaf-substance thick 

 and glossy, at summit rounded and very obtuse ; nerves distinct and prom- 

 inent, single and parallel for a short distance above the lowest visible 

 portion of base, then forking all nearly at the same height, with branches 

 parallel to near the summit ; at summit curving round to meet one another, 

 with a strong nerve uniting the abutting nerves. This peculiar plant is 

 much like Heer's genus Feildenia, from the Miocene of Greenland. 



