Class Order Suborder { =Protobranchiata= (p. 447). { { ANOMIACEA (p. 448). { =Filibranchiata= { ARCACEA (p. 448). { { MYTILACEA (p. 448). { { =Pseudolamellibranchiata= (p. 449). { =PELECYPODA= { { SUBMYTILACEA (p. 451). { { TELLINACEA (p. 453). { { VENERACEA (p. 454). { =Eulamellibranchiata= { CARDIACEA (p. 454). { { MYACEA (p. 456). { { PHOLADACEA (p. 457). { { ANATINACEA (p. 458). { =Septibranchiata= (p. 459). BRACHIOPODA Order Family { { Lingulidae (pp. 487 and 503). { { Obolidae (p. 504). { ECARDINES { Discinidae (pp. 487 and 504). =Brachiopoda= { { Craniidae (pp. 487 and 504). { { Trimerellidae (p. 504). { { { Productidae (p. 504). { { Strophomenidae (p. 505). { { Koninckinidae (p. 505). { { Spiriferidae (p. 505). { { Atrypidae (p. 505). { TESTICARDINES { Rhynchonellidae (pp. 487 and 505). { { Terebratulidae (pp. 487 and 506). { { Argiopidae (p. 506). { { Stringocephalidae (p. 506). { { Thecidiidae (pp. 487 and 506). LIST OF MAPS THE GEOGRAPHICAL DISTRIBUTION OF THE LAND OPERCULATE MOLLUSCA _Frontispiece_ THE GEOGRAPHICAL DISTRIBUTION OF THE LAND MOLLUSCA OF THE EAST INDIAN ARCHIPELAGO _Between pp. 308 and 309_ THE RELATIONS OF THE LAND MOLLUSCA OF NEW GUINEA WITH THOSE OF NORTH AUSTRALIA _To face p. 322_ THE GEOGRAPHICAL DISTRIBUTION OF THE LAND MOLLUSCA OF THE WEST INDIES _Between pp. 344 and 345_ MOLLUSCS BY REV. A. H. COOKE, M.A. Fellow and Tutor of King’s College, Cambridge CHAPTER I