126 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
Purpura lapillus (Linné) Lam. Gould, Inv. Mass., IT, p. 360, 1870. Mex, Inv. VS 
p. 642, 1874. 
Shore, rare. 
Anachis avara (Say) Perkins. Ver., Inv. V.S., p. 643, 1874. Gould, Inv. Mass., I, p. 
313, 1841; LI, p. 356, 1870 (Columbella). 
Rare; only a single specimen was found by the writer, but others have 
collected it at Provincetown. 
Astyris lunata (Say) Dall. Ver., Inv. V. S., p. 645, 1874.—Columbella lunata Gould, 
Inv. Mass., II, p. 359, 1870. 
Abundant in the eel-grass in front of the town and off the dike. 
Lunatia heros (Say) Adams. Gould, Inv. Mass., II, p. 338, 1870. Ver., Inv. V. 8. Ds 
646, 1874. 
Very common along the entire inner shore, and often picked up dead 
on the outer beaches. 
Neverita duplicata (Say) Stimp. Gould, Inv. Mass., IT, p. 345,1870. Ver., Inv. V.S., 
p. 646, 1874. 
Abundant, associated with Lunatia heros. 
Littorinella minuta (Totten) Stimp. Ver., Inv. V.S., p. 653, 1874. Gould, Inv. Mass., 
II, p. 298, 1870 (Rissoa). 
Common, shore at low water. 
Skenea planorbis ssi ) Forbes and Hanley. Gould, Inv. Mass., II, p. 296, 1870. 
Ver., Inv. V.S., p. 655, 1874. 
Common on the shore, with Tottenia gemma, Littorinella minuta, &c., 
and also on the piles of wharves. 
Littorina littorea (Linné) Johnston. Gould, Inv. Mass., II, p. 308, 1870. 
Very abundant on the shore, on piles of wharves, and on eel-grass 
which is more or less exposed at low tide. Just off the dike it occurs 
on the eel-grass in countless numbers, and, in common with all the other 
species of shells in that vicinity, is froiucnite covered with the white 
calcareous tubes of Hydroides dianthus. 
Tittorina rudis (Maton) Gould, Inv. Mass., I, p. 257, 1841; II, p.304,1870. Ver., Inv. 
V.S., p. 651, 1874.—L. tenebrosa Gould, Inv. Mass., I, p. 259; II, p. 306. 
This is an exceedingly common species on the shore. 
Littorina palliata (Say) Gould, Inv. Mass., I, p. 260, 1841; II, p.309,1870. Ver., Inv. 
V.S., p. 652, 1874. 
Common on the shore and on piles of wharves among sea-weeds. 
Lacuna vincta (Mont.) Turton. Gould, Inv. Mass., II, p.302,1870. Ver., Inv. V.S., 
p. 652, 1874, 
On the eel-grass, shallow water; not found in much abundance. 
