I 



ENTOMOSTRACA. -j^l 



grandi tectum, capite excluso suturaque discreto. Membra buc- 

 calia pedesque thoracis numero 12-16. Pedes thoracis 6-8 postici 

 foliacei. 



Tribus III. Cyproidea.* — Corpus breve, postice inflexum, testa 

 bivalvi oinnino tectum capite incluso. Membra buccalia pedesque 

 thoracis numero 10. Pedes thoracis postici in Cyclopoideis et Baph, 

 nioideis foliacei in Cyproideis obsoleti sunt. 



Legio II. PHYLLOPODA.f 



Pedes numero abnormales multum multiplicati. 



Tribus I. Artemioidea. J— Corpus fere rectum. Cephalothorax multi- 

 annulatus, testa sive tectus sive non tectus. Appendices cephalo- 

 thoracis plerumque foliacei. Oculi pedunculati. 



Tribus II. Apodoidea.§ — Corpus fere rectum. Cephalothorax testa 

 scutiformi tectus. Appendices cephalothoracis posteriores lamel- 

 late. Abdomen multiannulatum. Oculi sessiles. 



Tribus III. Limnadioidea.||— Corpus testa omnino tectum capite abdo- 

 mineque inclusis. Oculi sessiles. Habitu Cyproideis similis. 



The first of these tribes, Artemioidea, includes Chirocephalus (or 

 Branchipus), Arteinia, Eulimene, and Nebalia, which agree in their 

 pedunculate eyes, the divided posterior thoracic legs, and the straight 

 abdomen with terminal stylets or plates. In the character of the 

 abdomen they are related to Cyclops and the Myside; the multiplied 

 annulations in Chirocephalus constitute the main point of divergence. 



* Ostracoda, Latreille, Hist. Nat. des Crust, et des Insectes, 1802; Ostrapoda, 

 Strauss; Cyproides or Ostracodes, Edwards, Crust., iii. 393. 



f Latreille, Hist. Nat. des Crust, et des Insectes, 1802, iv. 130; also, most subsequent 

 authors. 



% Branchipiens, Edwards, Crust., iii. 364; Branchiopoda, Leach; BrancMpodidee, 

 Baird, Brit. Entoru., 38. 



§ Apusiens (in part), Edwards, iii. 353; Apodidse, Burmeister; Baird., loc. cit. 18. 

 || Apusiens (in part), Edwards, iii. 353. 



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