20 THE PALEONTOLOGY OF MINNESOTA. 



[Cratsegus, Protophyllum . 



This species, first found in the Dakota group of Colorado, has been lately sent 

 from Kansas also. It is not rare in Greenland. 



Hab. North side of Minnesota river, eight miles below New Dim, Minnesota. 

 Mus. Beg. Nos. 3808, 3912. 



ATAVINA Heer. 



PLATE B. FIG. 8. 



Arct. Fl., Vol. VII, p. 4S, PI. LXIV, /. 11. 



Leaves ovate, deeply cut on the borders in large obtuse teeth ; secondary nerves branch- 

 ing craspedodrome. 



The borders and the teeth of the leaf are destroyed, but the size, the shape 

 of the leaves and the nervation, seem to fully authorize the reference to 

 Heer's species. The leaf is coriaceous, the basal nerves opposite, attached above 

 the basal border; the five pairs of secondaries, at the same angle of divergence 

 of 60, are parallel and inequidistant, and of the same character as seen in the 

 figure of Heer, /. c. 



Hob. North side of the Big Cottonwood river, near New Ulm, Minnesota. 

 Mus. Eeg. No. 5379. 



PROTOPHYLLUM CREDNERIOIDES ? Lesqx. 



PLATE B, FIG fl. 



CVet. and Tert. FL, p. 90, PI. II, f. 1-3. 



Leaves coriaceous, usually small, nearly round, broadly cuneate, rounded or subtrun- 

 cate at base with a long slender petiole, borders entire or more generally undulate, nervation 

 obscurely trifid ; secondary nerves equidistant, at various angles of divergence more or less 

 branching. 



The leaf, which I refer with some doubt to this species, is only 4 cm. long and 

 3 broad, with a petiole 2 cm. long. Its shape is nearly round. It differs essentially 

 from the other leaves seen as yet of this species, in its less complex nervation, the 

 two lower lateral nerves only being branched, and the lateral primaries being alter- 

 nate. This difference may be due to the small size of the leaf, which has, notwith- 

 standing, the essential characters of the genus, the shape, the craspedodrome 

 nervation, and the long petiole. 



Hab. North side of the Big Cottonwood river, near New Ulm, Minnesota. 

 Mus. Reg. No. 5380. 



