230 CARL BOVALLIUS, AMPHIPODA HYPEKIIDEA. I. 2. HYPERIID^. 



Hyperia latissima. 



tissima taken in company with H. scliizogeneios from two different localities, I suppose 

 that this remark of Stebbing's niay be due to a similar circnmstance, the more so as the 

 two species resemble one another very much in general form of body, and the characteri- 

 stic projection of the under margin of the head in H. schizogeneios is easily overlooked. 



The m a 1 e. 



The forepart of the body is much broader than the hind part, but not twice as 

 broad, as it is in the female. 



The head is only a little more than half as long as the coalesced portion of the 

 perasuii. The antennal groove is large and deep, commencing above the middle of the 

 front side. The under margin of the head is semicircular. 



The jirst jjair of antennas are shorter than the second, but reach fully to the hind 

 margin of the first ural segment. The first joint of the peduncle is very large and tumid, 

 and more than three times as long as the two foUowing joints together. The hrst joint of 

 the flagellum is not a third part as wide as the first peduncular joint, and a little shorter 

 than the whole peduncle; the second and third joints are scarcely longer than broad; 

 the next five increase slowly in length; the following are equal, slender, cylindrical, about 

 seven tiraes as long as broad, and each provided with three sle:ider hairs on the under 

 side. The flagellar joints are twenty-five in number. 



The second pair of antennce are longer than the whole animal. The first free joint 

 of the peduncle is shorter than the second, the third is nearly as long as the two pre- 

 cediiig together; the glandular cone is large, sphterical, and almost as long as the first 

 joint. The first flagellar joint is the longest, the following are equal in length, cylindrical, 

 and about nine times as long as broad; they are twenty-two in number. 



The peroiopoda are like those of the female. 



The jdeon is fully as long as the whole perajon. The lateral parts of the segments 

 are rounded behind. 



The urus is nearly as long as the last pleonal segment. The first ural segment is 

 longer than the last coalesced, which is nearly a third part broader than long. 



The uropoda are like those of the female. 



The telson is a little more than half as long as the peduncle of the last pair of 

 uropoda. 



The female. 



Pl. XI, tig. 26—36. 



The forepart of the hody is more than twice as wide as the hind part, and gives 

 the animal the appearance of a ball, when the tail is folded up under the pera?on. 



The head is longer than in the male, and more than half as long as the coalesced 

 portion of the peraäon. The under margin is semicii^cular. 



