22 Crust. Entomostraca. 



II. Oculi pedunculo distincto. 



XII. Gentjs. Branchiopoda. Brancldopode. 

 Branchiopoda , LAM.—Apuf, Schxff. — Cancer , 

 Lin. — Gammarus , Fabricii. 



Corpus filiforme , substantia mollissima. Caput a tho- 



race collo parvo discretum , depressura , latum. Ocuh 



dno, laterales , exserti , stipitati , mobiles. Antennce duae , 



supra oculos postice inserlae , capillares , biarticulatae , 



breves. Frons tentaculis , corniculisve duobus , raobilibus ; 



in mare corneis, latere externo unidentatis , apice latiore, 



furcato ; in femina , cvlindracea , articulata, diaphana, 



apice papilla instructo ; filamenta duo capillaria, sim- 



plicia, elongata, fronti, basi tentaculorum inserta, cly- 



peusque antice bifidus , in mare. Os in utroque sexu 



papilla rostriformi , hamulata, corpusculis quatuor suf- - 



fulta. Truncus corporis cylindricus, supra subcarinatus, 



undecim segmentis ; singulo infra pedibus duobus bran- 



chialibus , foliaceis ; pari anteriore lamellis duabus, 



posticis tribus, quarum infima in pediculum basi effor- 



mata, ultima ovato-lanceolata. Cauda corporis circiter 



longitudine , angustior, subcylindrica, articulis plurimis 



(6., 9), ultimo pinnis duabus. Organa sexus ovariaque 



ad basin inferam caudae. 



Spec. 1. Branchiopoda stag-nalis. Branchiopode stagnul. 



Branchiopoda stagnalis. Lam. System. des anim. sans vert. , 

 pag. 1 6 1 . 



Branchiopode stagnal. Latr. Hist. nat. des Crust. et des 

 Insect., tom. 4 , pag. 5ig, pl. 56 et 37. 



Cancer slagnads. Linn. System. nat. , ed. 12, tom. 1 , pars 2, 

 pag. io56. — Faun. Suec. , ed. 2 , n°. 2o45. 



Gammarus stagnalis. Fab. Entom. system. , tom. 2,pag. 5i8. 



