^*i89^!''] pbocp:edingw of the national museum. 421 



Suborder ARCACEA. 

 Family AHOWjVj. 



(■(Mills ARCA Iiiiinai<;k. 

 18. Area truncata Sby. 

 Galaj)ag()s Islands, Carpenter. 



.SubgeuiiB BYSSOARCA Swaiiisou. 



19. Area (Byssoarca), solida Hby. 

 ludefati^able Island, Albatross. 



20. Byssoarca gradata H. Sl S. 



Hood Island, Albatross, Wimnierj Charles Island, Petrel; James, 

 Chatliam, and Indefatigable islands, Albatross. 



21. Byssoarca Reeviana Oili. 

 Hood, James, and Indefatigable islands. Albatross. 



Genus BARB ATI A Gray. 



22. Barbatia velata >S1>y. 

 Hood Island, Wininier. 



23. Barbatia decussata Shy. 

 Hoo<l Island, Wiinnicr. 



(J.Miiis DAPHNODERMA Mont., not Poli. 

 24. Daphnodernia divaricata Sby. 

 Galapagos Islands, Wimmer. 



Family LEI) 11)^:. 



(Jcinis LBDA Scliiiiiiaclier. 



25. Leda pontonia Dall. 

 Oft" Galapagos, 034 fathoms. Albatross. 



Order TELEODESM AC E A. 

 Suborder CARDITACEA. 

 Family CAKDITID^^:. 



Goiuis CARDITA IJru^iiiero. 



Subfreinis VENERICARDIA Lamarck. 



26. Cardita flatumea Micb. 



= C. raria, Brod. 



Hood and Jam<*s islands; Albatross; Bindloe, VVimmer; Galapagos, 

 Carpenter. 



