28 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Venus mercenaria LinnG 
One valve dredged at station 4. 
Gemma gemma (Totten). 
Gemma gemma , Dali, :02a, p. 378. 
One valve of this small species, still tinted with purple, dredged 
off western shore of Ironbound Island, 150 yards west of Iiyefield 
Point, 15 fathoms, mud and gravel. 
Liocyma fluctuosa (Gould). 
Tapes fluctuosa, Gould, ’70, p. 136. 
Lyocyma fluctuosa, Dali, :02a, p. 378. 
Rare, a few valves dredged at station 10. 
Macoma balthica (Linne). 
Macoma fusca, Gould, '70, p. 94. 
Macoma balthica, Dali, : 00, p. 298. 
Very abundant in shallow water. The shells vary greatly in soli¬ 
dity, some being thin and tinged with pink or yellow. 
Macoma calcarea (Gmelin). 
Macoma prozima, Gould, ’70, p. 95. 
Macoma calcarea , Dali, : 00, p. 299. 
Common, dredged in 10 to 15 fathoms, stations 1, 2, 4, 8, and lo 
Spisula (Hemimactra) polynyma (Stimpson). 
Mactra ovalis, Gould, ’70, p. 75. 
Only valves dredged as yet, station 18, though it is reported alive 
on Stave Island bar. 
Thracia conradi Couthouy. 
Rare, valves of large size dredged at stations 6 and 16. Young 
alive, small, station 7. 
Thracia myopsis Beck. 
Frequent, dredged at stations 2, 4, 12. 
Thracia truncata Migliels and Adams. 
Frequent, only valves dredged, stations 22, 24, and 27. 
