J. S. Newberry — Flora of the Great Falls Goal Field. 199 



Formation and locality, Kootanie group, Great Falls, Montana. 

 Collected by Mr. R. S. Williams and dedicated to him. 



Chiropteris spatidata, n. sp. 

 PL XIV, figs. 1, 2. 



Pinnules 1^-2 inches long, spatulate in outline, midrib strong, 

 lateral nerves well defined, coarsely reticulated. 



The plants to which I have given the above name have precisely 

 the nervation of the large rounded or lobate leaves, figured on the 

 same plate and named Chiropteris Williamsii; and I have there- 

 fore provisionally placed them together. The form of both spe- 

 cies is so different from that of the typical Chiropteris, that I have 

 included them in that genus with much hesitation. The nervation 

 is however so peculiar and so much alike in these two ferns, that 

 while waiting for more material that shall permit a new genus to 

 be defined upon them, I have concluded to group them together 

 and under the old name. 



Formation and locality, Kootanie group, Great Falls, Montana. 



Collected by Mr. R. S. Williams. 



Zamites apertus, n. sp. 

 PL XIV, fig. 4, 5. 



Fronds several inches in length by about one inch in width, 

 pinnules leaving the rachis at nearly a right angle, linear, obtuse, 

 somewhat widely separated ; nerves invisible, sunk in the paren- 

 chyma. 



This is a small species having the general aspect of Zamites 

 arctica, Goepp (Flora Arctica, vol. iii, p. 67, PI. XV, figs. 1, 2), 

 but is much more open in structure, the pinnules being separated 

 by spaces sometimes as wide as themselves. 



Formation and locality, Kootanie group, Great Falls of the 

 Missouri, Montana. 



Collected by R. S. Williams. 



Baiera brevifolia, n. sp. 

 PL XIV, fig. 3. 



Leaves flabellate, long petioled, one inch in width by one-half 

 to three-quarters of an inch in length, deeply lobed ; lobes trun- 

 cate, sometimes undulate and slightly contracted at the summit. 



This species has much the aspect of B. pluripartita, Schimper 

 (Palseontologie vegetale, vol. i, p. 423, PI. XXXI, tig. 12,) 

 (Schenk, Flora Nordwestdeutschen Wealdenformation, p. 10, PI. 

 Ill, figs. 1-8), but is much smaller. Possibly, however, it is 

 merely a depauperate form or smaller variety of that species. 

 Further material will be required for deciding this question. 

 However, the specimens which we have are not half the size of 

 those figured by Schimper, Schenk, Dunker and Brongniart. The 

 specimens of B. pluripartita ( Cyclopteris digitata, Dunker) are 

 all from the Wealden of different localities in Europe. 



