DESCRIPTION OF THE Sl'EClES. 311 



Locality: 72tl mile-post, near Brooke; very rare. 

 This plant resembles Velenovsky's Bomhax uryiUmcum} It also resem- 

 l)les in some j)oints Sapindopsis. 



POPULOPHYLLU^r, gen. nov. 



Leaves rotundate ; petiole thick and apparentl}- somewhat succulent ; 

 nerves tending- to a radiate grouping from the summit of the petiole; mid- 

 nerve not much surpassing in strength the nerves which go off on each side 

 of it. 



The leaves, which I place in this genus from their resemblance to Pop- 

 nlus, are too fragmentar}- to penrit their precise determination. They are 

 always rare, and form no important element of the flora. 



POPULOPHYLLUM RENIFOBME, sp. nOV. 

 Plate CLV, Fig. 9; Plate CLVI, Fig. 3. 



Leaves small, reniform, margins crenate ; petiole thick and apparently 

 succulent ; midnerve hardly stronger than the lateral nerves ; primary 

 nerves radiating from the base of the leaf, forking freely, and anastomosing 

 to form irregular, elongate, subrhombic, or pentagonal meshes ; leaf-sub- 

 stance rather thick. 



Locality : 72d mile-post, near Brooke ; quite rare. 



This plant is like Protcccphyllum renifonnc, but the margins are slightly 

 crenate, and it has a more pronounced midnerve. It is a good deal like 

 Populus retusa,- Heer, from Caj^e Lyell. 



POPULOPHYLLUM HEDER^JIFOKME, sp. nOV. 

 Plate CLXVI, Fig. 3. 



Leaf angular and polygonal in outline, small, entire shape not seen ; 

 leaf-substance thick and glossy ; petiole thick and long, apparently some- 

 what succulent; no midnerve seen; primary nerves of nearly equal 

 strength, radiating from the base of the leaf and forking higher up ; ulti- 

 mate nervation not seen. 



Locality: 72d mile-post ; very rare. 



' Dio Flor. der bobm. Kreideform., pt. 2, PI. IV, Figs. G-t). 



» Flor. Fo88. Arctica, vol.4, pt. 1, Beitriige zur foss. Flor. Spitzbcrgens, PI. XIV, Figs. G, 7. 



