CONTENTS IX 



CHAPTER XIY 

 Class Gasteropoda — Amphineura and Prosobranchiata . . . 400 



CHAPTER XV 



Class Gasteropoda {continued) : Opisthobraxchiata and Pulmonata . 427 



CHAPTER XVI 



Classes Scaphopoda and Pelecypoda 444 



BEACHIOPODA (EECENT) 



CHAPTER XVII 



Introduction— Shell— Body— Digestive System— Body Cavity-— Circu- 

 latory System — Excretory Organs — Muscles — Nervous System 

 — Reproductive System — Embryology — Habits — Distribution — 

 Classification 46;; 



BEACHIOPODA (FOSSIL) 



CHAPTER XVIII 



Introduction — Division I. Ecardines— External Characters — Inter- 

 nal Characters — Division II. Testicardines — External Char- 

 acters—Internal Characters — Synopsis of Families — Strati- 

 graphical Dlstributiun— Phylogeny and Ontogeny . . .491 



