PHl'LLOPODA. 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.* 



BRANCHTOPODA (pars), Lamarck, Hist. An. s. Vert., 1818. 



Latreille, Cuv. Regne Anim., 1829. 

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



MONOCULUS, Linnceus ; Fabricius ; Latreille (minus Lynceus), Prec. des 

 Car. gen. 



Character. Mouth furnished with organs fitted for 

 mastication ; branchia3 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-t 



PHYLLOPODA, Latreille, Hist. Nat. Crust., iv, 130, 1802 ; Gener. Crust, et 



Ins., i, 14. 

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



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

 Desmarest, Consid. gen. Crust., 357. 



/. E. Gray, Synops. Brit. Mus., 1842. 

 Burmeister, Organiz. of Trilobites, 34. 

 Lucas, Explor. Sc. de 1'Algerie, Crust., 81." 



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



BRANCHIOPODES LAMELLIPEDES and BRANCPIIOPODES GEANS (in part), 

 Lamarck, Hist. An. s. Vert., v. 



Character. Body either naked or having only the 

 head and thorax covered by the carapace ; feet numerous, 



* Bpayx ia > branchise or gills ; and vovg, a foot. 

 f *v\Xoi', a leaf ; and TTOI/C, a foot. 



2 





