154 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
PELECYPODA. 
PROTOBRANCHIATA. 
NlJCULIDAE. 
JYucula proximo, Say. Smith and Prime (’70), p. 385. Ter¬ 
rill (73), p. 691. 
Abundant everywhere on muddy or shelly bottoms below 1 fath. 
Ledidae. 
Yolclia limatula (Say). Terrill (73), p. 689. Leda limatula 
Smith and Prime (70), p. 385. 
Locally common in black mud, 3-6 fath., and attaining a length 
of 1^ inches. The number of teeth is variable, ranging from 16 
anterior and 13 posterior to 26 anterior and 24 posterior, so that the 
numbers usually given on the authority of Gould (22-18) are mis¬ 
leading. Probably, as Professor Terrill believes, they increase 
with age, but it is easy to find small specimens with many and 
large specimens with few teeth. In shape the specimens are all 
nearly typical limatulas , the form separated as Y. sapotilla not 
occurring. 
SOLENOMYIDAE. 
/Solenomya velum Say. Smith and Prime (70), p. 389. Ter¬ 
rill (73), p. 688. 
Locally not uncommon at and below low water; occurs a foot or 
so below the surface of the fine clean sand and mud in which it 
lives. 
FILIB R AN CHI AT A. 
Anomiidae. 
Anomia simplex d’Orbigny. A. ephippium Smith and Prime 
(70), p. 384. A. glabra Terrill (73), p. 696. S. 
Extremely abundant everywhere. In many places the dredge 
comes up filled with the dead shells to the exclusion of almost 
everything else. 
