CONTENTS OF VOL. III. 



i. 



ii. 

 in. 



IV. 



V. 



VI. 



VII. 



XXI. ARACHNIDA. By E. Kokschelt 

 Scorpiones ..... 



1. Cleavage and formation of the germ-layer 



2. The origin of the embryonic membranes and the development 



of the external form of the body . 



3. The formation of the organs 



A. The nervons system and the eyes 

 The lung-sacs 

 The intestinal canal . 

 The mesodermal derivatives 

 Blood-vascular system and coeloni 

 The coxal glands 

 The genital organs 



B. 

 G. 

 D. 



E. 



F. 



G. 



Pedipalpi 

 Pseudoscorpiones 

 Opiliones 

 Solifugae 

 Araneae 

 Oviposition and constitution of the egg 



1. 



2. 

 3. 



Cleavage and formation of germ-layers 

 Development of the external form of the body 

 The development of the organs 



A. The nervous system . 



B. The eyes .... 

 G. Survey of the Arachnidan ej - 



D. The respiratory organs 



E. The spinning glands and the poison glands 



F. The intestinal canal and its appendages . 



The mesodermal structures . 

 The blood- vascular system and the body-cavity 



G. 



H. 



I. 



The coxal glands 



VIII. 



The genital organs 

 Acarina 

 Oviposition 



1 . Embryonic development 



2. The formation of the larval 



course of development 

 General considerations regarding the Arachnids 

 Literature .... 



integuments 



and th<- further 



PAGE 



1 

 1 

 1 



4 

 12 

 12 

 19 

 19 

 22 

 23 

 24 

 25 

 26 

 27 

 32 



37 

 37 

 38 

 45 

 59 

 59 

 63 

 68 

 76 

 79 

 -1 

 B5 

 87 

 92 

 93 

 93 



94 



'.'7 

 110 



11- 



