A. E. Verrill—Post-pliocene fossils of Sankoty Head. 371 
Saxicavu arctica Deshayes. Rare and small. 
Arctic Ocean to Georgia, local and rare south of Lon 
Island; low-water to 50 fathoms. Fossil in the Post-pliocene 
of Maine and everywhere northwar 
Mya arenaria Linné. Abundant. 
Arctic Ocean (lat. 78° N.) to South Carolina; low-water 
Angulus tener Adams. Several specimens. 
Florida to Gulf of St. Lawrence; low-water to 12 fathoms. 
Cumingia tellinoides Conrad. Common. 
Florida to Cape Cod; three to 12 fathoms. In the Post- 
pliocene and Miocene of South Carolina, ete. 
Petricola pholadiformis Lamarck. Rare. 
Gulf of Mexico to Massachusetts Bay; local in Casco Bay 
Venus mercenaria Linné. The variety abundant; a nearly 
typical form not uncommon. 
orida to Massachusetts Bay; local on the southwestern 
coast of Maine and southern shores of the Gulf of St. Lawrence 
and Bay of Chaleur; low-water to 8 fathoms. In the Post- 
Var. antiqua Verrill.. By this name I propose to designate 
the unusually massive and strongly sculptured variety to which 
y 
exed, appressed and more or less confluent over the middle 
region, 4 the ordinary variety is nearly smooth (except 
