30 Art. 8. — A. Kjyshtofovich : 



segments in the bottom of the sinus between them. The nerves 

 of segments run forward making an acute angle. Closely allied to 

 the present species in form of frond and the position of sori is 

 Dlchsoniopteris vernonensis (Waed) Beeey^^ from the Potomac, which 

 has been compared by Beery with Dlcksonia hellidula He.,"^ from 

 which our species differs by sori being found strictly on the edge 

 of the segments, as in some Jurassic Coniopteris. In the same 

 point, our species resernblcs Dlcksonia concinna Heee'^' of the 

 Coniopteris type from the Jurassic of the Amur river. 



5. Asplenium DicJxSonianum Heer. 



1874. Heee, Die Kreideflora der arct. Zone, F. F. A. vol. Ill, i^art 2, 

 p. 31, t. I, f. 1-5. 



1882. Heer, Die fossile Flora Grönlands, F. F. A. vol. VI, part 2, p. 3, 

 t. II, f. 2, 2 b; p. 33, t. XXXII, f. 1-8. 



1883. Dawson, On the Cretaceous and Tertiary Floras of British Columbia 

 and the North West Territory, p. 11. 



1886. Dawsox, On the Mesozoio Floras of the Rocky Mountains Region of 



Canada p. 5, pi. Ill, f. 1. 

 1886. Dawson, Annual Report Canad. Geol. Survey, p. 76. 



1892. Lesquereux, Flora of the Dakota Group, p. 24, pi. I, f 1, 1 a. 



1893. Dawsox, On the Correlation of early Cretaceous Floras in Canada and 

 in United States, p. 91. 



1894. A\^ARD, The Cretaceous Rims of Black Hills, p. 259, 261. 



1895. Xeavberry, The Flora of the ^Vmboy Clays, p. 39, \>\. I, f. 6, 7 ; II, 

 f 1-8 ; III f. 3. 



1899. Fontaine, in Ward's 19tli Annual Report, p. 664, pi. CLXII, f. G-8. 

 1899. Ward, The Cretaceous Formation of the Black Hills, p. 704, pi. 

 CLXX, f 1. 



1) Beeey (1911 c), p. 23, pi. XXVni, f. 3, 4. 



2) Heeb (1874), p. 35, pi. U, f. 17 c, 17 d ; XI, f. S ; Hesk (18S2), p. 1 ; Heer (1883), p. 

 173. 



3) Heee (187G b), p. 87, pi. XVI, f. 1-7. 



