480 



Eciiinogammarus 



9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 



20 

 21 

 22 



Gnathopod 1, ßtli Joint smaller than that of 

 gnathopod 2 



(Tiiathopod 1, Ötli Joint larger thau that of 

 guathopod 2 — 3. 



Pleori closely beset wth spines 



Fleon with spines not closely set — ■ 4. 



Uropod 3 short 



Uropod 3 long — 5. 



Uropod 3, outer ramus abnormally long . . . 

 Uropod 3, outer ramus not abnormally long — 6. 



Antenna 1 considerably more than half as long 



as body — 7. 

 Antenna 1 about half as long as body — 9. 



Uropod 3 with setae short, separate .... 

 Uropod 3 with setae long, in fascicles — 8. 



Pleon Segments 1 and 2, doi'sal spinules not 

 confined to hind margin 



Pleon Segments 1 and 2, dorsal spinules wanting 

 unless on hind inargin 



Pleon Segment 3 with long dorsal hairs . . . 

 Pleon segment 3 without dorsal hairs . . . 



Pleon segment 1 without spines 



Pleon segment 1 with spines — 11. 



Gnathopod 2, 6tli Joint piriform 



Gnathopod 2, 6tli Joint oblong — 12. 



Pleon segment 3 without lateral ridge .... 

 Pleon segment 3 with lateral ridge — 13. 



Back of pleon warty 



Back of pleon not warty 



Peraeon segment 7 dorsally spinöse — 15. 

 Peraeon segment 7 not dorsally spinöse — 19. 



Eyes shaped like a retort 



Eyes reniform — 16. 



Peraeon segment 7, spines in a continuous series 

 Peraeon segment 7, spines in groups — 17. 

 Peraeon segment 7, spines in 6 groups . . . 

 Peraeon segment 7, spines in 2 groups — 18. 



Eyes narrowly reniform 



Eyes broadly reniform 



Eyes irregularly shaped 



Eyes regularly shaped — 20. 



Antenna 1 little longer than antenna 2, about 



half as long as body — 21. 

 Antenna 1 mucll longer than antenna 2, much 



more than half as long as body — 22. 

 No pleon segment with more than one row 



of dorsal spinules 



Some Segments of pleon with more than one 



row of dorsal spinules 



Eyes white; antenna 1 more than twice as 



long as body 



Eyes biack or reddish; antenna 1 less than 



twice as long as body — 23. 



1. E. berilloni . . . . p. 481 



2. E. verrucosus . . . p. 48 1 



3. E. saphirlnus . . . p. 482 



4. E. czerskli p. 482 



5. E. maackii p. 483 



6. E. Uvidus p. 483 



7. E. viridis p. 484 



8. E. cyaneus p. 484 



9. E. ochotensis . . . p. 484 

 10. E. testaceus . . . . p. 485 



11. E. sophiae 



1 2. E. fuseus 



p. 485 

 p. 486 



13. E. murinus 



14. E. aheneus . 



15. E. sarmatus . 



16. E. capreolus . 



17. E. ussolzewii 



18. E. stenophthalmus 



19. E. schamanensis . 



p. 486 

 p.487 



p.487 

 p. 488 

 p.488 



20. E. leptocerus 



p.489 

 p.489 

 p.490 



21. E. toxophthalmus 



22. E. vittatus .... 



23. E. petersii 



p. 490 

 p. 491 

 p. 491 



