X 



CONTENTS. 



Chapter XXII. PENTASTOMIDAE.. By E. Korschelt 



1. Embryonic development 



2. The larval development 



3. General considerations 



Literature ..... 



Chapter XXIII. PAXTOPODA. By E. Korschelt 

 Oviposition and care of the brood 



1. Cleavage and formation of the germ-layers 



2. The farther development of the embryo 



3. The form of the larva and its transformation into the 



4. General considerations 



Literature ..... 



Chapter XXIV. 

 Literature 



TARDIGRADA. By E. Korschelt 



adult 



Chapter XXV. OXYCHOPHORA (Peripatus). By E. Korschelt 

 Structure of the egg . . ... 



1. Cleavage and formation of the germ-layers 



Peripatus novae-zealandiae 



Peripatus capensis . . . . 



The American species . . . 



2. The development of the external form of the body 



3. The formation of the organs 



The ectodermal structures 



The integument . . . 



The nervous system and the ventral organs 



The eyes . . ... 



The slime- and the crural glands 

 The alimentary canal . . . . 



The mesodermal structures 



The body-cavity and the blood-vascular system 



The musculature . . . 



The nephridia . . . 



The salivary glands . . . . 



The anal glands . . . . 



The genital organs . . . 



Another account of the origin of the mesodermal structures 

 General considerations . . . . 



Literature ...... 



Chapter XXVI. MYRIOPODA. By E. Korschelt 

 Oviposition and the constitution of the egg 



1. Cleavage and formation of the germ-layers 



2. The development of the external form of the body 



A. Chilopoda . .... 



B. Diplopoda ..... 



The first rudiment of the embryo 



Flexure of the germ-band 



The further development of the embryo 



The interpretation of the mouth-parts of the Myriopoda 



Post-embryonic development . 



C. Symphyla and Pauropoda 



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