RELATIONS OF ACER PLEISTOCENICUM. 329 



acute. The margin is entire with the exception of two teeth, one on each 

 side and situated midway between each lateral lobe and its inferior lobe. 

 The sinuses are open, shallow, and well rounded. In many of these respects 

 it approaches Acer platanoides, from which it differs in its much broader 

 terminal lobe and in the broader and more shallow sinuses. 



The venation is most nearly comparable with that of Acer rubrum, where, 

 as in the fossil, only two veins are arranged palmately with the midrib, and 

 from these branch smaller veins which run to the small basal lobes. 



The second and third veins, lateral to the midrib, run to the principal 

 sinus of each side, where they terminate near the margin by repeated diehot- 

 omous branching. This, however, is common to several of the modern 

 maples. The finer venation is essentially the same as in our modern maples. 



It would appear from this that the fossil cannot be properly referred to 

 any of our existing species, and it appears desirable to give it a distinctive 

 name. I therefore propose to call it Acer pleistocenicum, as properly de- 

 scriptive. 



Revision op previously recorded Pleistocene Plants. 



The following specimens from Green's creek, as referred to by Sir William 

 Dawson in the preceding pages, have already been partially determined by 

 him and published in 1868, with figures of some of the species.* The pres- 

 ent revision shows a few changes and includes a few specimens not originally 

 noted, and which have been acquired by the Redpath Museum from the 

 collection of the late Mr. J. G. Miller since the publication of Sir William 

 Dawson's paper: 



DROSERA ROTUNDIFOLIA, L. 



A nodule containing a single specimen of what appears to be a leaf of 

 this plant, showing marginal projections and surface markings bearing some- 

 what close resemblance to the glandular hairs. Its association with the 

 fertile spike of an Equisetum shows it to have been a habitant of moist places 

 such as are usually favorable to its abundant development. It is a species 

 very commonly distributed throughout Canada. 



ACER SACCHARINUM, WANG. 



A basal fragment of a leaf in a nodule. This specimen was originally 

 designated f as A. montanum, Ait. (A. spicatum, Larnx). The only data on 

 which a determination is possible are to be found in the angles at which the 

 veins separate and in the number and distribution of such veins. With 

 reference to the first, it is to be observed that the angles of the veins with 



*Can. Nat, New Ser, Vol. Ill, p. 70 et seq. 

 t Ibid. 



