Chapter II: 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

BY

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