CHAPTER XIX. 



CRUSTACEA. 



Systematic : — 



A. ENTOMOSTRACA. 



a. Phyllopoda 



b. OSTRACODA. 

 C. ClRRIPEDIA. 



LI: 



Branchiopoda { A P m ' Bmnchipvs, 

 I Estheria. 



Cladocera. 



-c, -, f 1. Gnathostomata. 



. Eucopepoda -{ 

 d. Copepoda -| 12. Parasita. 



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, 



Gammarm, Ligla, Palaemon, Atyephyra, Crangon, etc). Where the 



