234 THE POTOMAC OR YOUNGER MESOZOIC FLORA. 



Possibly these specimens may be the narrower leaves on forms of the pre- 

 ceding species, but this is hardly probable. It is rare, but more common 

 than the preceding species. 



Laeicopsis brevifolia, sp. nov. 



Plate CII, Figs. 5, 6. 



Twigs slender, branching freely ; leaves distributed and attached as in 

 the preceding two species, thin, flat, wide in proportion to their length, 

 short, acute at the tips ; nerves not seen ; length of leaves 1™ and little 

 more, width 8°'™, crowded on the younger branches, deciduous when old. 



Localities: Fishing hut above Dutch Gap Canal ; entrance to Trent's 

 Reach. 



This plant is quite rare. The leaves are, in proportion to their length, 

 much wider than those of the two preceding species. Fig. 5 presents two 

 lower branches on the right-hand side that are entirely deprived of their 

 leaves. The leaves of this species look something like those of Heer's 

 genus Inolepis. 



TORREYA Arnott. 



Small ti'ees, with leaves linear or lanceolate, in two row.s, either oppo- 

 site or alternate, flat, decurrent at base, without a midrib, but marked 

 longitudinally on the lower side, on each side of the central line of the 

 leaf, by a narrow sunken band. 



This genus has not furnished to the Potomac flora any considerable 

 element, since the two species found are quite rare. 



TOKKEYA ViEGINICA, sp. nOV. 

 Plate CIX, Fig. 8. 



Stems slender ; leaves subopposite, linear, nari'owed gradually to the 

 base and apex, at the apex prolonged into a short spinous tip, attached by 

 a short slightly twisted footstalk to the margins of the stems or slightly 

 within them, slightly decurrent; midnerve not apparent. The leaves have 

 on each side of their axial line a strong cord-like line running through the 

 leaf nearly parallel, converging at the base and apex, and seeming to be 



