KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 



247 



2. HYPERIELLA DILATATA, TH. STEBBING, 1888. 



Diagn. Caput latum, segmentis tribiis primis peragi brevius. Pedes percei quinti paris capite ac perfeo 

 conjunctis breviores. Anguli antero-inferiores femoris, genus, et tibias peduni parium trium 

 ultimoruni pi-oducti et acuti. Metacarpus pedum septimi paris carpo lougior. Latera seg- 

 mentorum plei post acute producta. Pedunculus pedum uri ultimi paris plus quani quater 

 longior quam latior; ramus internus anguste elongatus, acutus. Telson segmentum ultimum 

 uri longitudine asquans, peduneulo pedum uri ultimi paris latius, ac dimidium pedunculi 

 ejusdem longitudine fere tequans. 



The head is broad, and shorter than the first tliree perseonal segments together. The fifth 

 pair of perwopoda are shorter than the head and perseon together. The lower front cor- 

 ners of the feniur, genu, and tibia of the last three pairs are produced and sharp-pointed. 

 The metacarpus of the seventh pair is longer than the carpus. The lateral parts of the 

 pleonal segments are produced behind, and sharp-pointed. The peduncle of the last pair 

 of uropoda is more than four times as long as broad; the inner ramus is narrowly elon- 

 gated, and sharp-pointed. The telson is as long as the last ural segment, is broader than, 

 and nearly half as long as, the peduncle of the last pair of uropoda. 



Colour. ? 



Length. »A quarter of an inch.» (Stebbing.) 



Hab. »Antarctic Ocean, Lat. 63° 30' S., Long. 

 and surface to 100 fathoms». (Stebbing.) 



1° 57' E.; surface; surface temperature 32' 



Syn. 1888. HypeMella dilaiaia, TH. STEBBING. 



»Keport 011 the Amphipoda». Voy. of H. 

 M. S. Challeuger. Zoology. Vol. 29, 

 p. 1403, pl. 171. 



In addition to the distingnishing characteristics given in the above diagnosis some 

 other diffevences of minor iniportance will be found upon a comparison of the above 

 description of HyperieUa antarctica with Stebbing's exhaustive description of H. dilatata 

 (1. c. p. 1403—1407). 



