124 204 



riora in medio fasciculis spinarum instructa. Epimera anteriora 

 mediocris magnitudinis. 



Antennae superiores inferioribus longiores; pedunculo inedio- 

 criter elongate. 



Antennae inferiores flagello brevi instructse. 



Pedes Imi et 2di paris manu parva; pedes 2di paris iisdein 

 Imi paris majores. 



Pedes saltatorii ultimi paris ramis longis, in margine spinis et 

 setis plumosis inslructis, ultra ramos duorurn parium anteriorum 

 porrectis ; ramo interiore plus minusve breviore qvam exteriore. 



Appendix caudalis longa, usqve ad basin fissa. 



G. Locusta. Linne 1767. 



Cancer locusta. Linne, Systema Naturae, ed. 12ma. p. 1055. 1767. 

 Cancer pulex. Linn6, ibidem. 



Gammarus locusta. Fabricius, Systema entoinologia. 1775. 

 Oniscus pulex. Fabricius, Fauna Groenl. 1780. p. 254. 

 Gammarus arcticus. Scoresby, An Account of the Arctic. Reg. 1. 



p. 541. II. tab. 16. fig. 14. 1820. 

 Gammarus boreus. Sabine, Supplem. t. the App. of Parry's first 



Voy. 229. 1824. 

 Gammarus Duebeni. Lilljeborg, Ofvers. af Kongl. Vet.-Akad. 



Forh. 1851. p. 22. 

 Gammarus mutatus. Lilljeborg, Kongl. Vet.-Akad. Handl. 1853. 



p. 447. 

 Gammarus sitchensi. Brandt, MiddendorfFs Sibir. Reise. II. parte. 



I. p. 133. 1851. 



Oculi magni, reniformes, nigri. Angulus inferior posticus seg- 

 inenti postabdominis 2di et 3tii in spinam productus. Dorsum 

 segment! postabdominis 4ti 6ti tribus processibus instructum; pro- 

 cessu 4ti rnedio spinis duabus crassis arinato; processibus lateralibus 

 spinis qvaternis armatis; processu medio segment! 5ti et 6ti spinis 

 binis et setis nonnullis instructo; processibus lateralibus segment! 

 5ti spinas qvinas, segment! 6ti binas gerentibus. Flagellum appen- 

 diculare 5 9articulatum. Pedes saltatorii ultimi paris aut ramis 



