GEOLOGICAL SURVEY OF THE TERRITORIES. 395 



DiospiEOS ANCEPS, Heer, M. Text. Helv. Ill, p. 12, PL cii, Figs. 15 to 18. 



The leaves of this species, of which we have also many specimens 

 from the same locality, are proportionally broader and shorter, with a 

 shorter, thick petiole ; the nervation is more simple, the secondary 

 veins, and their divisions more irregularly branching and anastomosing, 

 and the base of the leaves more rounded to the petiole. The secondary 

 veins branch outside, and their bows along the borders are formed by 

 anastomose with the upper branches ; the Tertiary divisions are, how- 

 ever, simple. The lower pair of secondary veins is generally opposite 

 the other alternate, all more curved in ascending than in the former 

 species. 



YlBURNUM MARGINATUM, sp. nOV. 



Leaves broadly ovate, or obovate, cuneiform to the petiole, round trun- 

 cate upward, abruptly short-pointed, regularly toothed, strongly pin- 

 nately veined, craspedodrome. 



This species is represented byalargenumberof specimens, indicating 

 its numerous distant forms. So different, indeed, are some of these 

 leaves that but for the permanent character of their nervation it would 

 be impossible to consider them as representing the same species. The 

 small leaves are about 5 cent, long, half as broad in the upper part, or 

 above the middle, tapering downward to the petiole. The largest are 12 

 to 14 cent, long, fully as broad below the middle, abruptly contracted to 

 the petiole, rounded upwards, or often nearly truncate to a short point 

 entered by the end of the medial nerve. The secondary veins are like 

 the medial nerve — broad, straight, distinctly marked, 6 to 6 pairs, at an 

 acute angle of divergence, 15 to 20°, all more or less branching outside, 

 according to their position, the branches straight, the largest ones sub- 

 dividing, and all the divisions entering the point of sharp teeth turned 

 outward, regular in form and distance. The petiole is half an inch long, 

 inflated at its base. The fruit is oblong, round, truncate at one end, 

 round, short-pointed at the other, contracted in the middle. By its 

 nervation this species is closely allied to our Viburnum puhescens, Pursh ; 

 the dentation of the leaves is like that of Viburnum dentatum, L., while 

 the veins and their divisions are of the same type as in Viburnum lan- 

 tanoides, Mich., and covered, as these, by a thick coating of villosity. 

 It extends, too, around the borders, marking them in black, like the 

 veins and their divisions, and forming a narrow, distinct border all 

 around the leaves. The fossil leaves especially differ from those of the 

 living species by their attenuated or wedge-form base. Some of the 

 species of Viburnum and Tilia^ described by Professor Newberry in his 

 notes on the extinct floras, appear to be referable to this species ; but 

 from the descriptions it is not possible to make an exact comj^ari- 

 son. The ultimate nervation is distinct in many of our leaves. The 

 thick fibrillsB in right angle to the secondary and tertiary divisions 

 branch irregularly, forming an irregular loose netting of mostly pen- 

 tagonal meshes. The leaves are dentate only from below the middle, 

 or from the point where the seconelary veins or divisions reach the 

 borders. 



YiBUENUM Wymperi, Hccr, Arct. PL, II, p. 475,- PI. xlvi, Fig. 18.- 



Leaf ovate, narrowed to an obtuse point, wedge-shaped, rounded to 

 the base, penni.nerve, craspedodrome. 



