KONGL. SV. VET. AKADEMIENS HANDL1NGAR. BAND. 22. N:0 7. 241 



Genus 5. HYPERIELLA, C. BOVALLIUS, 1887. 



Diagl). Caput permagnum, multo altius quam longius. Perceon leve, epimeris distinctis instractum. 

 Pedes perm primi paris subcheliformes; carpus dilatatus. Pedes secundi paris cheliformes; 

 carpus dilatatus et productus; processus cai-pi anguste concavus, in formam cochlearis re- 

 dactus. Carpus pedum tertii ac quarti parium non dilatatus. Pedes quinti paris ceteris 

 multo longiores; metacarpus valde elongatus. Pedes parium duorum ultimorum longitu- 

 dine equales pedibus tertii ac quarti parium non longiores. Pedes uri paullo elongati. 



The head is very large, and much deeper than long. The peroeon is smooth, with distinct 

 epimerals. The first pair of peraopoda are subcheliform; the carpus is dilated. The second 

 pair are cheliform; the carpus is dilated and produced; the carpal process is narrowly 

 concave, and narrowly spoon-shaped. The carpus of the third and fourth pairs is not dilated. 

 The fifth pair are much longer than the others; the metacarpus is very elongate. The 

 last two pairs are equal in length, and not longer than the third and fourth pairs. The 

 uropoda are somewhat elongated. 



Syn. 1887. Hyperiella, C. BOVALLIUS. »Systematical list of the Amphipoda Hy- 



periidea». Bih. t. K. Sv. Vet. Ak. Handl. 



Bd. 11. N:o 16, p. 19. 

 » »> 1887. » Arctic and Antarctic Hyperids». Vega- 



Exp. Vetensk. Iakttagelser. Bd. 4, p. 565. 

 » » Th. Stebbing. 1888. »Report on the Amphipoda». Voy. of H. 



M. S. Challenger. Zoology. Vol. 29, 



p. 1403. 



The genus Hyperiella resembles Hyperia in the large head, the thick body and 

 the form of the first two pairs of peraiopoda, but differs from it decidedly by the elonga- 

 tion of the fifth pair and of the uropoda, in which characteristics Hyperiella comes 

 near to Euthemisto; the form of the fifth pair is however not the same as in Euthemisto, 

 the carpus being normal in shape, and not dilated as in this latter genus. From Themi- 

 stella, which also has the fifth pair of perreopoda the longest, it is easily distinguished 

 by the form of body, the distinct epimerals, the dilated carpus of the first pair of perteo- 

 poda, and by the shortness of the last two pairs of peraeopoda. 



When in 1887 I proposed the new generic name I had for a type the new species 

 Hyperiella antarctica, and the next year Stebbing described a second species H. dila- 

 tata. ] ) These two species are similar in general form of body but distinguished by some 

 minor characteristics. 



*) In my "Systematical list of the Amphipoda Hyperiidea» Dana's Lestriijonus fuscus and Costa's Hy- 

 peria pupa are wrongly placed under Hyperiella instead of under ThemisteUa. 



K. Sv. Vet. Ak. Handl. Baud. 22. N:o 7. Ol 



