146 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERIID.^. 



Hyper ia. 



aaaaaaaa 2. The serration on the hind margin 

 of the metacarpus of the first pair 

 of perasopoda consists of three- 

 pointed teeth. _ . 5. H. galba. 



aaaaaaa 2. The front side of the carpal process of 

 the first pair of perasopoda is half as 

 long as the hind margin of the meta- 

 carpus ____ 6. II. Normani. 



aaaaaa 2. The hind margin of the metacarpus of the 

 first two pairs of pei'asopoda is notched and 



fringed with long spines 7. II. spiuigera. 



aaaa 2. The uropoda are narrow and slender. 



aaaaa 3. The last five pairs of peraeopoda are sparingly pro- 

 vided with short hairs _ 8. H. agilis. 



aaaaa 4. The last five pairs of peraaopoda are naked 9. H. fera. 



aaa 2. The front side of the carpal process of the first pair of 

 perajopoda is more than half as long as the hind margin of 



the metacarpus... _ ___ 10. II. beugalensis. 



aa 4. The first peraeonal segments is much longer than the second one 11. II. sibagiuis. 



B. The first peraeonal segment is free, the second, third, fourth and fifth coalesced, 



the last two free _._ 12. II. dysschistus. 



C. The first and second perasonal segments are coalesced, the following free. 

 C 1. The carpus of the first pair of peraaopoda is only a little dilated and 



scarcely produced. 



CC 1. The telson is not more than half as long as the peduncle of the 



last pair of uropoda _ IB. H. Fabrei. 



CC 2. The telson is much more than half as long as the peduncle of the 



last pair of uropoda. _ 14. II. luzoni. 



C 2. The carpus of the first pair of peraeopoda is very dilated and distinctly 



produced _ 15. II. promontorii. 



D. The first three peraeonal segments are coalesced, the last four free. 



(1 1. The telson is only a little broader than the peduncle of the last pair of 



uropoda, and not half as long as the same peduncle 16. II. Danse. 



d 2. The telson is twice as broad as the peduncle of the last pair of uropoda, 

 and more than half as long as the same peduncle. 

 dd 1. The front margin of the carpal process of the first pair of peraeo- 



poda is not half as long as the hind margin of the metacarpus 17. II. schizogeueios. 



dd 2. The front margin of the carpal process of the first pair of peraso- 



poda is more than half as long as the hind margin of the metacarpus 18. II. crucipes. 



E. The first four peneonal segments are coalesced, the last three free.. 19. II. latissima. 



F. The first five perasonal segments are coalesced, the last two free. 



f 1. The carpal process of the first pair of peraeopoda is very short, much 



shorter than half the hind margin of the metacarpus 20. II. thoracica. 



f 2. The carpal process of the first pair of peraeopoda is long, the front side 



more than half as long as the hind margin of the metacarpus. 21. II. Gilesi. 



