CHAPTER XIX. 



CRUSTACEA. 



Systematic : 



A. ENTOMOSTRACA. 



. Branchiopoda { 

 I 



I 



a, PHYLLOPODA -^ I Estheria. 



^23 [ll. Cladocera. 



b. OSTRACODA. 

 C. ClRRIPEDIA. 



f I. Eucopepoda { l ' Gnathostomata. 

 d. COPEPODA I 12. Parasita. 



[ II. Branchiura (Argulus). 



B. MALACOSTRACA. 



a. LEPTOSTRACA (Nebalia). 



b. THORACOSTRACA (Podophthalmata). 



I. Schizopoda (Euphausia, Mysis). 



{1. Macrura. 

 2. Anomura. 

 3. Brachyura. 



III. Stomatopoda. 



IV. Cumacea. 



c. ARTHROSTRACA (Edriophthalmata). 



I. Anisopoda (Tanais, Apseudes). 

 II. Isopoda. 

 III. Amphipoda. 



The Development of the Embryo. 

 1. Oviposition, Care of the Brood. 



The eggs of the Crustacea are, as a rule, spherical in form, 

 although in a few cases they are somewhat ellipsoidal (Oniscus, 

 Gfammarus, Ligia, Palaemon, Atyephyra, Crangon, etc). Where the 



