uuxjuiuucux.1 NEW SPECIES OF TERTIARY FOSSIL PLANTS. 309 



five or six in a circle, forming thus a small crenulate ring. The 

 perithecia become connected sometimes, apparently by decomposition ; 

 they are, however, generally separated. The size of the spots varies 

 from one to two millimeters. 

 Habitat. — Black Butte, upon Caulinites Sparganioides. 



2. Hypnum Haydenii, sp. nov. 



Stem rigid, sparingly divided in nearly opposite, short 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 Ranch, Dr. F. V. Hayden. 



3. Lygodium Marvinei, sp. nov. 



A single leaflet of this fine species. It is simple, ligulate, obtuse, 

 serrulate above, hastate at base ; middle vein and veiulets distinct ; 

 veins forking once or twice. Allied to the living Lygodium venustum 

 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 River group, near the mouth of White into Green 

 River, Prof. William Benton. 



5. Goniopteris pulchella, ? Heer. 



An intermediate form, represented by mere fragments of pinnae 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 nerva- 

 tion it represents G. Fischeri of the same author. 



Habitat. — Golden, iu sandstone, above coal. 



6. ZAMIOSTROBUS ? MIRABILIS, Sp. 110V. 



This species, whose reference to Zamice is not positively ascertained, 

 is represented by a fragment, the half cross-section of a silicified 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 vasculosocellular 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 white 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 ducts 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 



