MARINE MOLLUSKS OF THE GALAPAGOS 121 



Island, Loc. 27231 (C.A.S.), 1 valve; South Seymour Island, Loc. 



27255A (C.A.S.), 1 valve. 



Family Chamidae 



Chama squamuUgera Pilsbry & Lowe 

 Locality: Tower Island, Loc. 27231 (C.A.S.), 9 specimens. 



Chama frondosa mexicana Carpenter 



Locality: Tower Island, Loc. 27231 (C.A.S.), 9 valves. 



This species was cited from Tagus Cove, Albemarle Island, by 

 Pilsbry & Vanatta (1902, p. 551) under the name of Chama frondosa 

 purpurascens Conrad. 



Family Diplodontidae 



Diplodonta {Phlyctiderma) caelata (Reeve) 

 Locality: Indefatigable Island, Loc. 27232 (C.A.S.), 1 valve. 

 A single small valve appears to be referable to this species. 



Diplodonta subquadrata Carpenter 

 Locality: Albemarle Island, Loc. 27221 (C.A.S.), 4 valves. 



Family Lucinidae 



Ctena galapagana (Dall) 



Localities: Albemarle Island, Loc. 27221 (C.A.S.), 25 valves; 

 Chatham Island, Loc. 27227 (C.A.S.), 3 valves; Indefatigable Island, 

 Loc. 27232 (C.A.S.), 4 valves; Charles Island, Loc. 27238 (C.A.S.), 

 1 valve; South Seymour Island, Loc. 27255A (C.A.S.), 1 valve. 



The largest specimen in the present collection from Tagus Cove, 

 Albemarle Island, measures : length, 30.8 mm. ; height, 28.6 mm. 



Ctena mexicana (Dall) 

 Locality: Indefatigable Island, Loc. 27232 (C.A.S.), 3 small valves. 



Divaricella lucasana Dall & Ochsner 

 Locality: Indefatigable Island, Loc. 27232 (C.A.S.), 2 valves. 



