CONTENTS*. 



the Molluscoida 



K. Hkideil 



Chapter XVII. BRACHIOPODA— continued. 

 IV. General considerations 



Literature 

 Appendix — General considerations on 



Rhabdopleura and Cephalodiscus 



Literature 

 Chapter XVIII. ENTOPROCTA. By 



Embryonic development and larva 



Metamorphosis 



Asexual reproduction 



General considerations 



Literature 

 Chapter XIX. CRUSTACEA. By K. Heider 



Systematic 

 I. Development of the embryo 



1. Oviposition, care of the brood 



2. Cleavage and formation of the blastoderm 



Vitelline membrane 



Types of cleavage 



Blastodermic cuticle, larval integument 



Paracopulation . 



3. Formation of the germ-layers 



A. Copepoda . . , 



B. Phyllopoda . 



C. Cirripedia 



D. Decapod a . . . 



E. Schizopoda . 



F. Arthrostraca and Cumacea 



G. General considerations 



Types of development of the enteron 

 Formation of the mesoderm . 



4. Development of the external form of the body 



A. Entomostraca 



B. Arthrostraca and Cumacea 



Dorsal organ 



C. Leptostraca, Schizopoda, and Decapoda 



5. Formation of the organs 



A. External integument . 



B. Endoskeleton 



C. Nervous system 



Development of the brain 



Primary segmentation of the cephalic i 

 I). Sensory organs 



Development of the compound eye 



Development of the auditory organ 

 S. Gills 

 F. Intestinal canal 



Bntomoetraca 



Decapoda 



Arthrostraca 

 Q. Heart 



