128 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
LAMELLIBRANCHIATA. 
Teredo navalis Linné. Gould, Inv. Mass., IT, p. 28,1870. Ver., Inv. V.S., p. 669, 1874, 
Very abundant in the piles at the outer end of steamboat wharf, and 
in other situations. A few years ago about forty feet of the above-men- 
tioned wharf was so weakened by the borings of this shell-fish that it 
completely gave way under the weight of a ship’s load of merchandise 
stored upon it. 
Teredo megotara Hanley. Gould, Inv. Mass., II, p. 30,1870. Ver., Inv. V.S., p. 670, 
1874. 
At Provincetown, in cedar buoys (Gould). 
Teredo dilatata Stimp. Gould, Inv. Mass., II, p. 32, 1870. Ver., Iny. V. S., p. 670, 
1874. 
From pine buoy attached to lobster pots, at Provincetown (Gould). 
Ensatella americana (Gould) Ver., Am. Journ. Sci., vol. iii, pp. 212, 284, 1872; Inv- 
V.S., p. 674, 1874.—Solen americanus Gould, Iny. Mass., IL, p. 42, 1870. 
Many dead adult shells and living young were collected on the sand- 
flats at low water. 
Mya arenaria Linné. Gould, Inv. Mass., IT, p. 55,1870. Ver., Inv. V.S., p. 672, 1874. 
Very abundant on the shores and flats; especially so on the broad 
flats between the town and Wood End Light House, where, in the clean 
sands, the shells are often of a nearly pure white. 
Lyonsia hyalina Con. Gould, Inv. Mass., II, p.64,1870. Ver., Inv. V.S8., p. 672, 1874. 
Quite common at low water on the inner shore at Provincetown, and 
in the inlet behind Race Point Light House. It was also picked up in 
extreme abundance on the outer beach at Race Point. 
Cochlodesma Leanum (Say) Couth.. Gould, Inv. Mass., II, p. 68, 1870. Ver., Inv. 
V. S., p. 673, 1874. 
Dead shells in fresh condition were collected on the outer beach at 
Race Point, but not on the inner. 
Spisula solidissima (Dillw.) Gray.—Mactra solidissima Gould, Inv. Mass., II, p. 73, 
1870. Ver., Inv. V.S., p. 680, 1374. 
Living young and adult dead shells were frequently found on the 
shore at low water. 
Ceronia arctata (Con.) Adams. Gould, Inv. Mass., II, p. 80, 1870. Ver., Inv. V.8., 
p. 679, 1874. 
Many living specimens were obtained by Prof. H. E. Webster in the 
inlet behind Race Point Light House and on the outer beach near the 
same place; not known from the inner shore. 
