158 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Macoma tenta (Say). Smith and Prime (’70), p. 389. Yerrill 
(73), P . 078. S. 
Locally abundant in black mud below tide marks. 
Macoma balthica (Linn6). M. fragilis Adams. Yerrill (73), 
p. 676. Tellina fusca Philippi. Smith and Prime (70), p. 389. 
Dead but perfectly fresh and unusually large specimens locally 
common 1-3 feet deep in black mud at low-water mark in Upper 
Harbor. The animals doubtless live in numbers close by, prob¬ 
ably deeper in the soft mud, although in more northern waters 
and on harder ground it may be found alive free upon the surface. 
The rather surprising combination of the heavy shell and epidermis 
characteristic of muddy localities with the brilliant rose color 
usually seen only in small shells from clean sand occurs. 
Macoma sabulosa (Spengler). Yerrill (73), p. 677. N. 
One valve found by Dr. J. I. Hamaker was so identified by him. 
Semelidae. 
Cumingia tellinoides (Conrad.). Smith and Prime (70), p. 
388. Yerrill (73), p. 679. S. 
A few valves on hard bottoms in 4 fath. Rare. 
Mactridae. 
Mactra solidissima Dillwyn. Smith and Prime (70), p. 388. 
Yerrill (73), p. 680. 
Relatively not very common or very large. Lives in mud and 
sand in more exposed situations. 
Mactra lateralis Say. Smith and Prime (70), p. 388. Yerrill 
(73), p. 680. S. 
Abundant in black mud below tide marks, slightly buried. 
Yeneridae. 
Venus mercenaria Linne. Smith and Prime (70), p. 388. Yer¬ 
rill (73), p. 681. S. 
Yery abundant below tide marks. A considerable clam-fishery 
exists. 
Cytherea convexa Say. Smith and Prime (70), p. 388. Cal- 
lista c. Yerrill (73), p. 681. N. 
