LESQCEEEux.] PALEONTOLOGY ^LIGNITIC FLORA SPECIES. 391 



§ 3.— DESCEIPTIOE^ OF SPECIES. 



I have described here only the forms which are considered as new 

 species, with those, which though already known from Europe, had not 

 yet been recognized from American specimens. A few also are re- 

 marked upon, which, represented by better specimens, have their char- 

 acters and their relation more clearly defined. 



The researches of the past year have added to the American Tertiary 

 flora about one hundred species, of which sixty are new ones. The whole 

 number represented in the tables of distribution amounts now to nearly 

 three hundred and sixty. 



I have followed for the description the same plan as in the two 

 former annual reports of Dr. Hayden, briefly exposed the essential 

 characters of the species, and quoted references for analogies whenever 

 I could find any in the publications of European authors, in order to 

 obviate the absence of figures, which, though, now already made, have 

 to be reserved for a final report. 



Except for the specimens found by myself, the names of the discov- 

 erers are carefully recorded, with the localities where the fossil remains 

 have been touud. 



SPECIES OF THE FIEST GROUP. 

 WOODWARDIA LATILOBA, sp. UOV. 



Frond large, bipinnatifid ; pinna) opposite, decurrent upon the thick 

 rachis, long, linear, slightly tapering to the point, equally lobed; lobes 

 disjointed to three-fourths of their length, united by narrow obtuse 

 sinuses, broadly lanceolate, obtuse, scythe-shaped upward, becoming 

 more connivent toward the point of the pinnae ; upper pinnse more and 

 more obtusely and less deeply lobed, passing to mere equal undulations; 

 nervation undistinct, except the middle nerve of the lobes, which is 

 narrow but well marked, ascending to the point of the lobes; second- 

 ary veins parallel to the rachis and to the middle nerve, branching in 

 ascending, forming by anastomoses of their divisions one or two rows 

 of large areolae, and joining the borders in i^arallel veinlets. 



Large and splendid specimens have been obtained of this form by 

 Mr. Arthur Lakes, of the School of Mines of Golden, to whom the survey 

 owes many valuable discoveries. The numerous fragments represent the 

 characters of the whole frond. Its consistence is thick, coriaceous ; the 

 surface is smooth, nearly polished ; and the details of nervation are 

 recognizable only upon fragments which show the lower surface of the 

 pinnae, or whose ujiper surface is destroyed by maceration. The fructi- 

 fications have not been discovered yet. 



Habitat. — Golden ; South Table Mountain, A. Lakes. 



WoODWARDIA LATILOBA, var. MINOR. 



Only small fragments of this form have been obtained at Black Butte. 

 They represent the upper part of a pinna of exactly the same form and 

 with the same mode of division as the specimens of Golden. The lobes, 

 however, are much smaller, less scythe-shaped; the basilar veins follow 

 the rachis, as in the former species, going Irom the base of one middle 

 nerve to that of the other above, forming thus a band on both sides of 

 the rachis, passing also in long areas up and along the middle nerve of 

 the lobes and from their anastomoses ascending to the borders and 

 forking twice. In the normal form, the veins, though thicker, are less 



