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



247 



2. HYPERIELLA DILATATA, TH. STEBBING, 1888. 



Diagu. Caput latum, segmentis tribus primis perasi brevius. Pedes percei quinti paris capite ac peraso 

 conjunctis breviores. Anguli antero-inferiores femoris, genus, et tibiae pedum parium trium 

 ultimorum producti et acuti. Metacarpus pedum septimi paris carpo longior. Latera seg- 

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

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

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

 ejusdem longitudine fere asquans. 



The head is broad, and shorter than the first three pergonal segments together. The fifth 

 pair of perceopoda are shorter than the head and peraeon together. The lower front cor- 

 ners of the femur, 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. 88° 57' E.; surface; surface temperature 32°; 

 and surface to 100 fathoms». (Stebbing.) 



Syil. 1888. Hyperiella dzlatata, TH. STEBBING. 



"Report on the Amphipoda». Voy. of H. 

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

 p. 1403, pi. 171. 



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

 other differences of minor importance will be found upon a comparison of the above 

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

 (1. c. p. 1403—1407). 



