Note on Balanus Hameri. 289 
In the same deposits were found shells of Saxicava Arctica. 
Tellina (Macoma) Groenlandica and Mya arenaria of a small 
variety. These shells would indicate cold and not very deep 
water; and although B. Hameri is at present a deep-water 
species, it is probable that in cold water it lives, like some 
other species, nearer the surface than in the warmer seas. 
The specimens were found in an excavation near the rail- 
way, and so far as appears from the descriptions, in beds 
which belong to the top of the Leda clay and base of the 
Saxicayva sand, a position which is usually the most produc- 
tive part of our Pleistocene deposits in fossil shells. 
From a note and sketch kindly furnished to me bv Mr. 
Stanton, it appears that the shells occur about 27 feet below 
the surface, and about 11 feet above the level of Lake St. 
Francis. The containing beds are clay and sand, and above 
these are alternations of clay, sand and gravel, the top being 
gravel, with boulders immediately under the surface soil. 
The position of the shells would thus appear to be in what I 
have called the Upper Leda clay, or the base of the Saxicava 
sand, and under the newer gravel and boulder deposit which 
often caps the latter. 
(2.) Species of Mya, and Varietal Forms. 
In my Notes on the Post Pliocene of Canada,’ I have re- 
marked on the small size, peculiar forms and comparative 
rarity of Mya arenaria in the Pleistocene, as compared with 
the modern Gulf and River St. Lawrence, and on the abun- 
dance of Mya truncata, and especially of the short variety 
(M. Uddevalensie), while Mya truncata is comparatively 
rare in the modern waters of our coast, and the short 
variety especially so. I had last summer an opportunity at 
Little Metis to see both species and their different varieties 
living together in such a manner as to illustrate better the 
causes Of the difference of the Pleistocene forms. 
At the head of Little Metis Buy, where the water is shal- 
' Canadian Naturalist, 1872. 
