Mya arenaria Linn. 



Fig. i Recent specimen (left valve) from the New York coast. 



Fig. 2 Outlines of left valves showing comparison in size of the largest 

 Pleistocene specimens from localities in Canada and New York with one of the 

 largest recent specimens, a, recent, New York coast; b, Canada (Geol. Can. 

 1863, p. 963); c, Cumberland Head; d, McBride bay; e, Valcour island. 



194 



