ANNULOSA. 558 



9. GAMMARUS. 10. AMPHITHOE. 11. PIIEIIUSA. 



Division V. Antennae four-jointed, under ones longest, 

 leg-shaped. (Four anterior legs monodactyle.) 



Subdivision 1. Second pair of legs with a large hand. 



12. PODOCERUS. 13. TASSA. 



Subdivision 2. Second pair of legs with a moderate 

 sized hand. 



14. COROPHIUM. 



SECTION III. 

 Body depressed. Antenna four. Legs fourteen. 



A. Tail without appendices. 



Division 1. Body with all the segments bearing legs. 

 Subdivision 1. Body linear. 



15. PHOTO. 16. CAPKELLA. 

 Subdivision 2. Body broad. 



17. LARUXDA. 



Division II. Body with all the segments not bearing 

 legs. 



18. IDOTEA. 19. STENOSOMA. 



B. Tail on each side with one or two appendices. 

 Division I. Antennae inserted in nearly the same hori- 

 zontal line. 



20. ANTIIURA. 



Division II. Antennae inserted in pairs, one above the 

 other. 



Subdivision I. Tail with one lamella on each side. 



21. CAMPECOPEA. 22. N^ESA. 



Subdivision II. Tail with two lamellae on each side. 



* Superior antenna with a very large peduncle. Claws 

 bifid. 



23. CYMODICE. 24. DYNAMINE. 25. SPILEROMA. 



** Superior antennae with a very large peduncle. Claw 

 single. 



26. .EGA. 





