160 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
SOLENIDAE. 
Ensis americana (Gould). Ensatella a. Verrill (’73), p. 674. 
Solen ensis Linne. Smith and Prime (’70), p. 389. 
Tolerably common in sand or clean mud at and below extreme 
low water. 
Pandoridae. 
Clidiophora gouldiana Dali. C. trilineata Verrill (’73), p. 673. 
Pandora t. Smith and Prime (’70), p. 390. 
Locally common in black mud, 3-6 fath., with Yoldia limatula. 
Lyonsidae. 
Lyonsia hyalina (Conrad). Smith and Prime (’70), p. 390. 
Verrill (73), p. 672. 
Rather uncommon. Locally on hard bottom in 3-6 fath. 
Teredidae. 
Teredo navalis LinnC Verrill (73), p. 669. S. 
Not uncommon. The submerged timber is honey-combed by 
ship worms, but in only a few instances was the species determined. 
Of these all but one were of this species. 
Xylotrya jimbriata Jeffreys. Verrill (73), p. 670. S. 
Found in an old hull. 
Besides the above, fourteen species of land and fresh-water shells 
occurred in the immediate vicinity of the Laboratory; and some of 
them occasionally in company with Alexia myosotis and Melampus 
lineatus given above as marine. 
