DESClill'TION OF TUE Sl'EClES. 253 



like. The plant is a good deal like Velenovsky's Sequoia hctcroplti/lla, in 

 those forms with the shortest and most appressed leaves (see Die Gymno- 

 sperm. der bohmisch. Kreideformation, PI. XIII, Figs G, 8). It is also like 

 some of the forms of Ci/pnrissi<Uiim Heer, but the leaves are longer and 

 narrower than those of this genus. 



Taxodium (Glyptostrobus) fastigiatum, sp. nov. 



Plate CXXV, Figs. 1, 3. 



Stems branching copiously ; twigs long, cylindrical, branching at long 

 intervals in a dichotomous manner and very irregularly, the branches as- 

 suming a fastigiate grouping ; lateral leaves on the older twigs oblong to 

 ovate, acute, decurrent, diverging slightly, and incurved ; facial leaves close 

 appressed, elongate-oblong, towards the summit of the stem elliptical to 

 ovate-acute; leaves on the younger twigs elongate-oblong to narrowly 

 elliptical, close appressed, or with the lateral ones sometimes slightly diverg- 

 ing ; midnerve distinct, but slender and thread-like. 



Localities : 72d mile-post, near Brooke ; hill-side near Potomac Run. 



This plant is rare at the 72d mile-post, but is one of the most common 

 conifers at the Potomac Run locality. The specimen figured in PI. CXXV, 

 Fig. 1 , must have been originally very large, for the lower and detached 

 branch is plainly a part of the upper portion. This plant is, in the form of 

 the leaves, like Gli/ptostrobus Europmis, and may possibly be an ancestral 

 form of this species. The leaves and twigs remind one of Biota pcndula 

 Endlichei', one of the varieties of B. oricntaUs. 



TAXOUUJiM (Glyptostkobus) denticulatum, sp. nov. 



Plate CXXIV, Fig. 1. 



Branches comparatively stout and rigid, rather copiously pinnately 

 and alternately subdivided; leaves thick, convex, very elongate- oblong to 

 elongate and narrowly elli[)tical, close appressed, with ends lancet-shaped 

 and prolonged into an acute spinous tij), midnerve strong and proniinunt. 



Locality : Kankey's. 



Only one specimen was found, but as the material accessible was very 

 limited in amount and unfavorable for the preservation of specimens, no 



