DESCRIPTIONS OF SPECIES. 95 



of place in the publication where they both originally appeared, the name Magnolia 

 obovata becomes a nomen nudum. How this could have escaped Dr. Newberry's 

 attention or the attention of subsequent workers and reviewers is strange. A. H. 



Magnolia rotundifolia Newb. 

 Pi. LIX, fig. 1. 

 Proc. U. S. Nat. Mus., Vol. V (March 31, 1883), p. 513. 



"Leaves petioled, large (8 inches in length by 6 inches in width), 

 round-ovate in outline, rounded or blunt-pointed above and slightly wed°-e- 

 shaped below; margins entire; nervation open and delicate; four to six 

 lateral branches given off from the midrib at remote and irregular dis- 

 tances, curving gently upward, and forming festoons near the margin." 



Collected by Dr. F. V. Hayden. 



In general form this fine species would seem to be somewhat like 

 M. regalis Heer (Fl. Foss. Arct, Vol. IV, Abth. I, p. 81, PI. XX; XXI, 

 figs. 1, 2) and M. Nordenskioldia Heer (op. cit., p. 82, PI. XXI, fig. 3; 

 XXX, fig. 1), but with a much more slender and less crowded nervation 

 than the first and a more rounded form than the second. A number of 

 specimens in the collection show some diversity of form, and it is possible 

 that the leaf figured is more rounded and less pointed than the average, 

 but unless there should be very great departure from this standard there 

 is little probability of this species being united with any other. The ner- 

 vation is almost precisely that of the living M. acuminata, and there can 

 not be any reasonable doubt that it is a representative of the same genus. 



Formation and locality: Cretaceous (Laramie group). Fischers Peak, 

 Colorado. 



Liriodendeon Mkekii Heer. 



PL VI, figs. 5, 6. 



Proc. Phil. Acad. Nat. Sci. 1858, p. 265; Nouv. Mem. Soc. Helv. Sci. Nat., Vol. 



XXII (1866), p. 21, PI. IV, figs. 3, 4; Ills. Cret. and Tert. PI. (1S78), PI. VI, 



figs. 5, 6 [fig. 6 under L. primcuvum] . 



Note. — So identified by Dr. Newberry, as indicated by memoranda on margin 

 of plate and on specimen label. — A. H. 



Formation and locality: Cretaceous (Dakota group). Blackbird Hill, 

 Nebraska 



