MARINE MOLLUSKS OF THE GALAPAGOS 137 



Family Littorinidae 

 Tectarius galapagiensis (Stearns) 



Localities: Albemarle Island, Loc. 27221 (C.A.S.), 20 specimens; 

 James Island, Loc. 27222 (C.A.S.), 16 specimens; Tower Island, 

 Loc. 27231 (C.A.S.), 8 specimens; Indefatigable Island, Loc. 27232 

 (C.A.S.), 3 specimens. 



Family Fossaridae 



Fossarus abjectus (C. B. Adams) 



Localities: Albemarle Island, Loc. 27221 (C.A.S.), 8 specimens; 

 Tower Island, Loc. 27231 (C.A.S.), 1 specimen. 



Fossarus angiostomus (C. B. Adams) 



Localities: Albemarle Island, Loc. 27221 (C.A.S.), 4 specimens; 

 Tower Island, Loc. 27231 (C.A.S.), 10 specimens; Indefatigable Island, 

 Loc. 27232 (C.A.S.), 4 specimens. 



Fossarus sp. 

 Locality: Tower Island, Loc. 27231 (C.A.S.), 30 specimens. 



Family Modulidae 

 Modulus cerodes A. Adams 



Locality: Albemarle Island, Loc. 27221 (C.A.S.), 8 adult and a 

 number of young specimens. 



Family Architectonicidae 



Heliacus planispira Pilsbry & Lowe 

 Locality: Albemarle Island, Loc. 27221 (C.A.S.), 2 specimens. 



Family Litiopidae 



Alaba supralirata (Carpenter) 



Locality: Albemarle Island, Loc. 27221 (C.A.S.), 25 specimens. 



