TABLE OF CONTENTS. 



PAG* 



Articulated Animals . . 369 



Insects 369 



Myriapodes 411 



Arachnides 412 



Crustacea 422 



Worms (Vermes) . . .454 



Annelides 454 



Rotatoria 456 



Turbellaria 458 



Helminthia 458 



Cestoides 459 



Mollusca 466 



Mollusca, properly so called 466 

 Cephalopodes . . . .463 



PACK 



Gasteropodes . . . .471 



Pteropodes 475 



Acephala 475 



Molluscoides 478 



Tunicata, properly so called 478 



Briozoaria 480 



Zoophytes.- 481 



Echinodennata .... 483 



Acalepha 484 



Polyps 485 



Infusoria 489 



Spongiaria 490 



The Geographical Distribu- 

 tion of Animals . . 491 



