242 TBE POTOMAC OR YOUNGER MESOZOIC FLORA. 



large, being 14™" by 11"" on an average, scales and other parts as in the 

 generic description. 



Localities: Hill-side near Potomac Run ; entrance to Trent's Reach; 

 banks of Dutch Gap Canal ; fishing hut above the canal. 



This plant is very common in large specimens at the first and last 

 named localities. At the Potomac Run locality, on the hill-side in the 

 woods, it is, next to the ferns, the most common plant, but it is not found on 

 the road-side only a few hundred feet away. The fine specimen, PI. CXV, 

 Fig. 2, comes from the fishing hut. The lower detached fragments were 

 once no doubt attached to the same stem with the upper portion. This 

 figure shows well the characteristic mode of branching of the species and 

 the wide spread of the twigs. This species shows a mode of preservation 

 of the twigs common in this but rare in the others. In it the leaves on 

 the upper face of the older stems have fallen off, exposing the slender 

 woody axis, whereas on the ultimate youngest twigs all the leaves are pre- 

 served. The cone, PI. CXVII, Fig. 6, from Potomac Run, is no doubt 

 globular in form on account of distortion, being compressed in the direc- 

 tion of its length. These cones are larger than those of A. grandis. Plate 

 CXXXV, Fig. 15, gives one of the largest size. 



AtHROTAXOPSIS PACHYPHYLLA, sp. nov. 

 Plate CXV, Figs.l, 3; Plate CXVII, Figs. 1, 3-5. 



Small trees or shrubs, copiously branching, with branches all in one 

 plane, comparatively stout, rigid, and mostly long, cylindrical in shape; 

 ultimate twigs mostly simple ; leaves very thick, prominent, horny in 

 texture, with strong keel, arranged as in the preceding species, elliptical to 

 rhombic in shape, very durable, dropping off with increasing age ; cones 

 not seen. 



Localities: In the banks of Dutch Gap Canal; fishing hut above 

 Dutch Gap Canal. 



This plant is one of the most common ones in the banks of Dutch 

 Gap Canal. It occurs, however, in a very fragmentary condition. It is 

 characterized by the thickness of the leaves. 



