PHYLLOPODA. 17 



ciliated ; and by their undergoing a regular moulting or 

 change of shell as they grow, in some amounting to a 

 species of transformation. 



Legion I— BRANCHIOPODA.* 



Branchiopoda {pars), Lamarck, Hist. An. s. Vert., 1818. 



— Latreille, Cuv. Regne Anim., 1829. 



— M. Edwards, Hist. Nat. Crust., 1840. 

 MoNOCTJLXJS, Limtceus ; Fabricius ; Latreille (minus Lynceus), Prec. des 



Car. gen. 



Character. — Mouth furnished with organs fitted for 

 mastication ; branchise many, attached to the feet ; body 

 sometimes naked, but most frequently having an envelope 

 in form of a buckler, in some inclosing only the head 

 and thorax, in others the whole body ; feet vary in num- 

 ber, all branchiferous ; antennae two or four, jointed, and 

 generally ciliated ; eyes, sometimes two or even three, 

 but frequently only one, or so closely approximated as to 

 appear single. They are all free and unattached, swim- 

 ming at large in the water. 



Order I— PHYLLOPODA. f 



Phyllopoda, Latreille, Hist. Nat. Crust., iv, 130, 1802 ; Gencr. Cnist. et 

 Ins., i, 14. 



— Leach, Diet. Sc. Nat., xiv, art. Entomost. 



— M. Edwards, Hist. Nat. Crust., iii, 351. 



— Desmarest, Consid. gen. Crust., 357. 



— /. E. Oray, Syuops. Brit. Mus., 18-42. 



— Burmeister, Orgauiz. of Trilobites, 34. 



— Lucas, Explor. Sc. de I'Algerie, Crust., 81. 

 Phyllopa, Latreille, Cuv. Regne Anim., iv, 171. 



Branchiopodes Lamellipedes and Branchiopodes Geans (in part), 

 Lamarck, Hist. Aii. s. Vert., v. 



Character. — Body either naked or having only the 

 head and thorax covered by the carapace ; feet numerous, 



* Bpay;^;f a, branchiae or gills ; and ttovq, a foot, 

 f *v\Xo)', a leaf; and ttoi^c, a foot. 



2 



