372 A. EF. Verrill—Post-pliocene fossils of Sankoty Head. 
when young). The violet color can still be traced in some 
specimens entirely around the inner margin, as in many recent 
Nantucket examples. 
Tottenia gemma Perkins. Few specimens obtained. 
South Carolina to Labrador; low-water to 4 fathoms. 
Gouldia mactracea Gould. One specimen. 
Florida to Cape Cod; 3 to 15 fathoms. 
Scapharca transversa Adams. Very abundant and large. 
Florida to Cape Cod ; low-water to 15 fathoms. In the Post- 
eee of Cape Cod, Gardiner’s I., Virginia, South Carolina ; 
iocene of Virginia and North Carolina. 
Mytilus edulis Linné. Common. 
Cireumpolar; Arctic Ocean to North Carolina; littoral to 
50 fathoms. In the Post-pliocene from Florida to Greenland 
and Northern Europe. 
Modiola hamatus Verrill. Common. 
Gulf of Mexico to Long Island Sound and Naragansett Bay; 
littoral. 
Crenella glandula Adams. Few specimens obtained. 
Labrador to Long Island; 5 to 60 fathoms. In the Post- 
pliocene of Montreal. 
Anomia glabra Verrill. 
Florida to Cape Cod; and locally farther north to Nova 
Scotia ; littoral to 20 fathoms. In the Post-pliocene and Plio- 
cene of South Carolina. 
Ostrea Virginiana Lister. Abundant and well-grown. 
Gulf of Mexico to Cape Cod, and locally farther north, at 
Damariscotta, Me., and in the southern part of the Gulf of St. 
Lawrence; low-water to 5 fathoms. In the Post-pliocene of 
Point Shirley, Gardiner’s I., South Carolina, ete. h th 
short, rounded specimens and the much elongated and narrow 
forms occur, as well as all the intermediate states, Just as in 
many modern oyster-beds, showing that in Post-pliocene times 
the same kind of individual variations prevailed that have 
perplexed many modern systematists, but they have not yet 
become specific, nor even definite varietal characters. 
Bryozoa. 
Hippothoa variabilis V. (Escharella variabilis Verrill, in Report 
on Invert.) Common on ula, ete. 
, ete. 
Florida to Massachusetts Bay ; low-water to twenty fathoms. 
Biflustra tenuis V. (Membranipora tenuis (Desor) ; Verrill, 12 
Report on Invert.) Common on shells. 
«copies to Massachusetts Bay: low-water to 15 fathoms. 
Membranipora catenularia Smitt. Common on shells. a 
