FOSSILS OF THE CHAMPLAIX CLAYS. 7.19 



of the same species from tlie (•la^• l)auk near Fort River and cast of tlic Fair 

 Groumls in Amherst. Here tliey were matted together, leaves and twigs, 

 in a hiver several millimeters thick over a small surface. Later I obtained 

 the same leaves in some al)undance from the clav' l)cds at the cutting south 

 of College Hill, opjjosite the Central station, where the clays rise t<,) their 

 greatest height. I have also found them at the brick pits beyond the asylum 

 at Northampton. 



Besides the abundant trails of minute dipterous larva', nine plants 

 have been identified with arctic and subarctic species by comparison with 

 White ]\[ountain and arctic plants in the Amherst Herbarium; these are 

 enumerated below. 



Viola pidustri.'i L. Very small leaves, round heart-shaped, crenate, with 

 four principal veins, agreeing well with the smallest leaves from the White 

 ^Mountains. Two or three leaves at Hadley. Sevei'al at the Hampshire 

 Park locality, Amherst. 



T(u-ciniiim oxycoccus L. — Leaves punctate above, rolled up underneath, 

 heart-shaped posteriorly; stem short and broad. .While they agree in shape 

 and size closely with the species to wliii'h I have referred them, the vena- 

 tion, which is indistinct in the herbarium specimens I have examined, is 

 Avell marked in the fossil specimens. I have assumed this to be the result 

 of maceration in the latter, since, so far as I could compare them, the vena- 

 tion was alike in both. Twigs occur carrying several leaves and several 

 nicely preserved seed vessels. Very abundant both at Hadley and at 

 Hampshire Park south of College Hill, Amherst. 



Vaccinimn uligmosuni L. — Very rare; Hadley. 



Rhododendron lapponicuni Wahl. — vSingle leaves; refeiTed with some 

 doubt to this species. Hadley. 



Arctostaphylos alpina Spr. — Several leaves agreeing exactly with those 

 from the W^hite Mountains. Hadlev. 



Aniostaphylos uva-ursi Spr. — Single leaves; referred with some doubt 

 to this species. Hadley. 



Oxyria digyna Campd. — The single impression of a small lenticular 

 seed vessel, which agrees very closely with the impression made by the 

 opened achenium of the mountain sorrel. Hadley. 



Salix cufleri Tuck. — Leaves agreeing exactly with this species are 

 found oftener than an}' other. They ai'e often folded together along the 



