72 ROYAL SOCIETY OF CANADA 



not add materially to the number of previously recorded species, never- 

 theless furnishes further information of value as to the abundance of 

 certain species. As transmitted to me by Prof. A. P. Coleman in the 

 latter part of April, the species are comprised in two lots. The first 

 was obtained from the Don Valley Brickyard, and includes five good 

 specimens of wood, and a large number of fragments of leaves, repre- 

 sentative of ten different species. The second lot was derived from 

 Logan's Brickyard, tind embraces twelve specimens of wood representa- 

 tive of two genera. 



Don Valley Brichjard. 



Acer pleistooenicuiii, Penh. 



This species has been found on only two occasions heretofore, the 

 first being in 1890, when the original description was made,^ and the 

 second in 1898, when a specimen was obtained by Prof. A. P. Coleman 

 from Taylor's Brickyard.^ There has therefore been reason to regard 

 it as a species which was not abundantly represented in the flora of the 

 Don period, and that it may have been at the limit of its existence at 

 that time. In the material recently received, however, it is represented 

 by no less than thirty-three out of sixty-five recognizable specimens, 

 or to the extent of 50.7% of the whole. From this it is evidently 

 necessary to modify any previous expression of opinion, since it is 

 obvious that the tree must have constituted a prominent element of 

 the flora. 



Since our last enumeration of the Interglacial plants of the Don 

 Valley, attention has been directed to a maple from the Tertiary of 

 Randolph County, Wyoming, which Lesquereux described under the 

 name of A. indivisum,^ but which, owing to the preoccupation of this 

 name by 0. Weber, Knowlton, has rechristened A. l"squereuxii This 

 leaf is des'crilicd as thin and small, aud five lobed, but an inspection 

 or the figure leads us to the belief that the apparently five lobed form 

 is in reality due to breakage and obliteration of certain of the veins 

 through decay. If this supposition be correct, then the leaf is really 

 seven lobed, and this would explain certain otherwise unaccountable 

 features of the figure. Assuming this to have been the case, then A. 

 hsguereuxii and A. pleistocenicum cannot well be separated from one 

 another, since Lesquereux's original diagnosis of " lobes entire, sharply 

 acuminate; sinuses broad, entire or dentate in the middle" are as ap- 



• Bull. Geol. Soc. Amer., I, 327, 1890. 



■ Rept. B.A.A.S., Bristol, 1898, 527. 



3. U.S. Geol. Surv. of the Terr., Cret. & Tert. Flor.. VIII., ISO. 1S83. 



