TABLE OF CONTENTS. 



PAGB 



Table op Contents ......;. iii 



List of Illustrations . . , . , . . vii 

 Peeface . . . . . . . . . . xiii 



Table of Stkatified Rocks xiv 



Introduction ......... xv 



INVERTEBRATA. 



Subkingdom I.— MOLLUSCA 1 



Class I. — Cephalopoda 6 



Order 1. Dibranchiata . , . . ,11 



,, 2. Tetrabranchiata , . . . 17 



(a) Nautiloidea . . . .21 



(J) Ammonoidea ... 30 



Class II. — ^CATKOTODA {Benfalium) . . . .45 



Class III. — Amphineura. Polyplacophora (Chiton), etc. 45 



/ 1 . Opisthobranchiata (including 

 ^,^ ^ \ the Pteropoda) . . . 43 



ClassIV.-GASTEROPODA 2.Pul^onata ... 45 

 ( 3. Prosobranchiata . . .46 



Class y.— ^LamiIllibranchiata 45 



