TABLE OF CONTENTS. 
PAGE 
Definition and Subdivisions of Arthropoda .... 9 
Plan of the Gallery ........ 10 
Class 1.— CRUSTACEA ll 
Parasitism and Adaptations to Environment .... 23 
Classification of Crustacea ....... 25 
Sub-Class— BRANCHIOPODA 25 
Order — P hyllopoda ...... 25 
Sub -Order — A nostraca ..... 26 
,, Notostraca ..... 26 
„ CONCHOSTRACA ..... 27 
Order — C ladocera ....... 27 
Sub-Class— OSTRACODA 28 
„ COPEPODA 29 
Order — E ucopepoda ...... 30 
,, Branchiura . . . . . . 30 
Sub-Class— CIRRIPEDIA 31 
Order — T horacica ....... 32 
Sub-Order — P edunculata ..... 32 
,, Operculata ..... 33 
Order — R hizocephala ...... 35 
Sub-Class— MALACOSTRACA 36 
Series— LEPTOSTRACA 36 
Division— P hyllocaeida 36 
Series— EUMALACOSTRACA 36 
Division — S yncarida .37 
,, Peracarida ...... 38 
Order — M ysidacea ....... 38 
,, Cumacea ....... 39 
,, Tanaidacea ...... 40 
,, ISOPODA ....... 41 
