particularly so in our common Myrica ccrifcra Linn, which 

 might also be derived from the Matawan species. It is at least 

 related and except for its somewhat smaller size and the irregu- 

 lar nature of the marginal characters it is strictly comparable. 



The Cliffwood leaf is also very similar to Myrica (?) trifoliaia 

 Newb. 1 in size, shape and margin, but is lunger petioled and not 

 trifoliate. Among the ten species found in the Dakota group 

 are several approaching ours in size, the one most similar, 

 Myrica aspcra Lesq.- has the same texture, size and margin; 



obsolete, the midrib more slender, and the petiole considerably 

 longer if we may judge from Lesquereux's figure winch appears 

 to be that of a sessile leaf. This species has also been men- 

 tioned as the possible ancestor of the living Myrica ccrifcra Linn. 



Myrica torrcyi Lesq. is the possible descendant of Myrica 

 hccrn in the Montana and Laramie formations, with more 

 pronounced marginal teeth. A number of unrelated Cretaceous 

 leaves are somewhat similar in form and margin, as for instance 

 Ilex barcalis I leer, E headend rou speciosum Lesq.. and Rhus 

 powelliana Lesq., but all differ in other particulars. Another 

 species from the Dakota group which resembles our leaf is 

 referred by Lesquereux to the somewhat smaller leaved species 

 Protcoidcs acuta H eer. Like the Matawan leaf this also contains 

 smaller entire margined leaves, but the tip is more extended, the 

 undulations of the margin are wider, and the base indicates that 

 the leaves were sessile. 



Viburnum hollickii sp. now Pigs. 5. 6. 



Viburnum zeJiympcri I leer, Know] ton, Bull. l\ S. Gcol. Sin 

 163. pi. 19, f. 3. 1900 {mm pi. 17 f. I, and pi. 18 f. 1). 



