128 PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



LAMELLIBEANCHIATA. 

 Teredo navalis Linn6. Gould, luv. Mass., II, p. 28, 1870. Ver., Inv. V. S., p. 669, 1874, 



Very abundant iu the piles at tlie 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 (Grould). 



Teredo dilatata Stimp. Gould, Inv. Mass., II, p. 32, 1870. Ver., Inv. 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; luv. 

 V. S., p. 674, 1874. — Solen americanus Gould, Inv. Mass., II, p. 42, 1870. 



Many dead adult shells and living young were collected on the sand- 

 flats at low water. 



Mya arenaria Linn^. Gould, Inv. Mass., II, 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. S., p. 672, 1874. 

 Quite common at low water on the inner shore at Provincetown, and 

 in the inlet behind Eace Point Light House. It was also picked up in 

 extreme abundance on the outer beach at Eace 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 

 Eace Point, but not on the inner. 



Spisula solidissima (Dillw.) Gray. — Mactra soUdiasima Gould, Inv. Mass., II, p. 73, 

 1870. Ver. , In v. V. S. , p. 680, 1 874, 



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. S., 

 p. 679, 1874. 



Many living specimens were obtained by Prof. H. E. Webster in the 

 inlet behind Eace Point Light House and on the outer beach near the 

 same place ; not known from the inner shore. 



