383 



2. Hypnum Haydenti, sp. nov. 



Stem rigid, spariugly divided in uearly opposite, sliort branches, in- 

 flated toward the top, or club-shaped ; leaves closely imbricated all 

 around, lanceolate-acuminate or sharply pointed, concave. Comparable 

 especially to Hypnum Boscii, Schwgr., an American species of the pres- 

 ent time. 



Habitat. — South Park, near Castello Eauch, Br. F. V. Sayclen. 



3. Lygodium Marvinei, sp. nov. 



A single leaflet of this fine species ; simple, ligulate, obtuse, serrulate 

 above, hastate at base f middle vein and veinlets distinct ; veins fork- 

 ing once or twice. Allied to the living Lygodium vennstum, a species 

 which ranges from Mexico to Brazil. 



Habitat. — Top of gypsum series, Grand Eagle junction, A. B. 

 Marvine. 



4. Lygodium Dentoni, sp. nov. 



Leaflets bi-tripartite, with short, obtuse divisions and broad sinuses, 

 broadly triangular, rapidly narrowed to a subcordate or subtruncate 

 base, entire, bi-trinerved from the base ; primary nerves distinct, like 

 the veins, which are forked once or twice, and become very close along 

 the borders. 



Habitat. — Green Kiver group, near the mouth of White into Green 

 Eiver, Frof. William Benton. 



5. GoNiOPTEEis PULCHBLLA,? Heer. 



An intermediate form, represented by mere fragments of pinn?e and 

 separate pinnules. The shape of the pinnules united to the middle refers 

 it to G. pulchella, while by the less-pointed leaflets and the nervation it 

 represents G. FisclieH of the same author. 



Habitat. — Golden, in sandstone, above coal. 



6. Zamiostrobus ? jiirabilis, up. nov. 



This species, whose reference to Zamixi^ not positively ascertained, 

 is represented by a fragment, the half cross-section of a silicifled cone, 

 about fourteen centimeters in diameter. The outer surface is marked 

 by the rhomboidal obtuse top of black seeds, or stony fruits, surrounded 

 by a white vasculoso-cellular matter. In the cross-section of the cone, 

 these seeds, of an enlarged rhomboidal form, three to three and a half 

 centimeters long, six to eight millimeters broad, of the same size in 

 their whole length, or slightly narrowed to the base, appear fixed or 

 implanted into a zone of whitish, subpellucid mass of celluloso-vascu- 

 lar filaments. Under this ring of wliite matter, one centimeter thick, 

 comes the central part, or axis of the cone, represented by mixed frag- 

 ments of blackish opaque matter, agglutinated and amorphous. The 

 fruits, or seeds, are represented by a black, compact, opaque silex, pierced 

 in the length by large pores or duct's passing from the top to the base 

 of the fruits. The intervals between them, nearly as large as the seeds, 

 are filled by the same whitish celluloso-vascular matter which com- 

 poses the white zone wherein the base of the fruits is embedded. The 

 figure only of the specimen can give a good idea of this fragment of 

 cone. It is distantly comparable, for the form and the disposition of its 

 surface-scars, to Androstrobus, a genus established by Schimper for 

 some cylindrical cycadeous male cones, formed of imbricated scales bear- 

 ing sessile anthers on their lower surface. For the position of the fruitSj 

 it has a distant relation to Zamiostrohus gibhiis, Reuss., a cone which 



