CHAPTEE XIX. 



CRUSTACEA. 



Systematic : — 



A. ENTOMOSTRACA. 



C T T> 1 • J r Apus, Brandiipus, 

 1. iirancliiopoda { . 



I Estheria. 



II. Cladocera. 



a, Phyllopoda 



...uis!] 

 h. OSTRACODA. 



C. CiRRIPEDIA. 



1. Eucopepoda -{ 



I 2, Parasita. 



II. Branchiura (^r^wZws). 



B. :malacostraca. 



a. Lbptostraca (Nebalia). 



b. Thoracostraca (Podophthalmata). 



I. Schizopoda {Eupliausia, Mysis). 



' 1. Macrura. 



II. Decapoda < 2. Anomura. 



. 3. Brachyiira. 

 III. Stomatopoda. 



lA^. Cumacea. 



c. Arthrostraca (Edriophthalniata). 



I. Anisopoda (Tanais, A2)seudes). 

 II. Isopoda. 

 y 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, 

 Gammarus, Ligia, Palaemon, Atyephyra, Grangon, etc). Where the 



