MARESTE GAMMARIDEAN AMPHIPODA 135 



Mandibular molar small, or absent, unarmed or bearing one to three spines 

 (fig. 60d) 6 



3. Palp of maxilla 1 with two articles (fig. 60j) Gitanopsis 



Palp of maxilla 1 with one article (fig. 60/c) 4 



4. Outer plate of maxilliped strongly excavate medially, article 1 of palp much 



longer than other palp articles (fig. 60p) Gitanogeiton 



Outer plate of maxilliped straight or slightly excavate medially, article 1 of 

 palp subequal to article 2 (fig. 60o) 5 



5. Gnathopod 2 large, subchelate (fig. 60^) Amphilochopsis 



Gnathopod 2 small, nearly simple (fig. 60m) Gitana 



6. Maxilla 2 composed of only one elongate plate (fig. 60m) . . Amphilochella 

 Maxilla 2 composed of two plates (fig. 600 7 



7. Maxilla 2 degraded, plates tiny, subequal in width (fig. 60re) 8 



Maxilla 2 normal, inner plate much broader than outer (fig. 600 .... 9 



8. Posterolateral angles of pleonite 6 not produced Amphilochoides 



Posterolateral angles of pleonite 6 produced, reaching apex of telson. 



Cyclotelson 



9. Telson entire (fig. 6O2;) Amphilochus 



Telson cleft (fig. 60y) Pseudamphilochus 



10. Article 2 of pereopods 4-5 linear, slender 11 



Article 2 of pereopod 5 and usually pereopod 4 expanded 12 



11. Palm of gnathopod 2 transverse, urosomite 3 vaulting over telson, telson 



small Cyproidea 



Palm of gnathopod 2 oblique, urosomite 3 not vaulting over telson, telson 

 huge Paracyproidea 



12. Urosomite 1 unkeeled, long or short 13 



Urosomite 1 dorsally keeled, elongate 14 



13. Gnathopod 2 simple; uropod 2 shortened, not reaching end of uropod 3 



(figs. 59a,b) Stegoplax 



Gnathopod 2 subchelate, with transverse palm; uropod 2 reaching end of 

 uropod 3 (figs. 60bb,cc) Peltocoxa 



14. Article 2 of pereopod 3 slender, linear 15 



Article 2 of pereopod 3 expanded 16 



15. Palp of maxilla 1 biarticulate, outer plate of maxilliped reaching to end of 



palp article 2, article 7 of gnathopod 1 apparently fitting oblique palm. 



Hoplopleon 

 Palp of maxilla 1 uniarticulate, outer plate of maxilliped reaching to end of 

 palp article 1, article 7 of gnathopod 1 greatly overlapping short, trans- 

 verse palm Hoplopheonoides 



16. Mandibular palp present Peltopes 



Mandibular palp absent Neocyproidea 



Genera of Amphilochidae 



Subfamily Amphilochinae, new subfamily 



Type-genus: Amphilochus 'Ba.te. 



Coxae 2-4 not immensely broadened, with contiguous margins 

 overlapping. 



