GEOLOGICAL SURVEY OF THE TERRITORIES. 407 



Fraxinus dentic;ulata, Heer, Arct. Flor. I, p. 118, pi. xlvii, Fig. 2., 



This leaf is intermediate between the one figured loc. cit., and another 

 much smaller, with more acute teeth, (PI. XVI, Fig. 4.) It is nearly as 

 large as the first, with large, obtuse, distant teeth, bat with a distinct 

 nervation like that of the second, the lowest secondary veins curving 

 and anastomosing along the borders, with divisions or uervilles enter- 

 ing the teeth ; while the upper ones directly end into them. There is no 

 doubt about the identity of these leaves with those figured by Heer, 

 but 1 am uncertain if they represent a species of Fraxinus. 



QlTEECUS CIILOKOPIIYLLA, (?) Uug. 



Same species of leaves as those described under this name from Mar- 

 shall. 



k Nyssa lanceolata, Sp. nov. 



Leaves subcoriaceous, entire, broadly Inuceolatc-pointed, rounded to 

 the petiole, secondary veins alternate, paraMel camptodrome. 



The leaves are 7^ cent, long, 4 cent, broad in the broadest part, 

 with 9 pairs of secondary alternate veins, diverging 40° from the med- 

 ial nerve, curving in ascending to the borders, where they disappear ; 

 areolation punctate. The nervation and areolation are as in our living 

 Nyssa muJf iff oni., Wang. The form of the leaves, however, is different, 

 the fossil ones being broader below the middle, more rounded in descend- 

 ing to the petiole. Except Kijssa ininciata, Ueer, in Bait. Flor., the 

 European tertiary species are known only by the fruits. The Baltic 

 species, like Nyssa (f) vetusta, Newb., are far different from this one. 

 Three species of Xy.s.'M are known, by fructifications only, from the 

 Brandon lignites of Vermont. 



Six miles above Spring Canon. 



EhamjN'us acuminatifolius, O. Web. 



Leaves large, broadly oval, accuminatc pointed, rounded to the base; 

 secondary veins parallel, curving to and along the borders ; uervilles 

 indistinct. 



These leaves, represented by two fragments only, differ from Jtiglans 

 rugosa., Lsqx., by round base and a less distinct and more regidar nerva- 

 tion. They may, however, be mere varieties of this omnipresent and 

 polymorphous species. The same form has been found at Golden. 



Ehus BELLA, (?) Heer, Flor. Arct. II, p. 483, PI. Ivi, Figs. 4 and 5. 



The lower half of a subcoriaceous entire leaflet, gradually tapering 

 from the middle to a petiole, appearing part of a compound leaf. The 

 specimen is not suflicient for a reliable *i<leutification. The nervation, 

 like the form of the leaf, are, however, the same as in Heer's species. 



Above Spring Caiion, near Fort Ellis. 



JUGLANS RUGOSA, Lsqx. 



The specimens from all the localities of this station represent distant 

 varieties of this species. The leaves are especially variable in size, 

 some still larger than the largest forms of Jiiylans acwninaia, published 

 by Heer, some so small that though the characters taken from nerva- 



