CHAPTER XVIII. Introduction--Division I. Ecardines--External

INTRODUCTION--DIVISION I. ECARDINES--EXTERNAL CHARACTERS--INTERNAL CHARACTERS--DIVISION II. TESTICARDINES--EXTERNAL CHARACTERS--INTERNAL CHARACTERS--SYNOPSIS OF FAMILIES--STRATIGRAPHICAL DISTRIBUTION--PHYLOGENY AND ONTOGENY 491

SCHEME OF THE CLASSIFICATION ADOPTED IN THIS BOOK

MOLLUSCA

Class Order Sub-order Section { OCTOPODA (p. 382). { { Phragmophora (p. 386). { =Dibranchiata= { { Sepiophora (p. 388). { { { { { DECAPODA { Chondrophora { Myopsidae (p. 389). { { { { Oigopsidae (p. 390). =CEPHALOPODA= { { { NAUTILOIDEA { Retrosiphonata (p. 393). { { { Prosiphonata (p. 395). { =Tetrabranchiata= { { { AMMONOIDEA { Prosiphonata (p. 397). { { { Prosiphonata (p. 397).

{ =Amphineura= { POLYPLACOPHORA (p. 400). { { APLACOPHORA (p. 404). { { { { Docoglossa (p. 405). { { DIOTOCARDIA { { Zygobranchiata { { { Rhipidoglossa { (p. 406). { { { { Azygobranchiata { =Prosobranchiata= { { { (p. 407). { { { { { Ptenoglossa (p. 411). { { { { Platypoda (p. 411). { { { Taenioglossa { Heteropoda (p. 420). { { MONOTOCARDIA { =GASTEROPODA= { { { Gymnoglossa (p. 422). { { { { { { Toxoglossa (p. 426). { { { { Bulloidea (p. 429). { { TECTIBRANCHIATA { Aplysioidea (p. 430). { { { Pleurobranchoidea (p. 431). { { { Siphonarioidea (p. 431). { { { =Opisthobranchiata= { ASCOGLOSSA (p. 431). { { { { NUDIBRANCHIATA { Cladohepatica (p. 432). { { { Holohepatica (p. 433). { { { { PTEROPODA { Thecosomata (p. 435). { { { Gymnosomata (p. 437). { { { { =Pulmonata= { BASOMMATOPHORA (p. 438). { { STYLOMMATOPHORA (p. 439).

=SCAPHOPODA= (p. 444).

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

REV. A. H. COOKE, M.A. Fellow and Tutor of King’s College, Cambridge