17 



same family, and as that author has made the Hyperids his special stndv, 

 1 do not feel at present entitled to dissent from his opinion on tin's 

 point. In the restricted sense in which the genus is taken by Uovallius, it 

 only contains a single species, for the T. X(-<l< iivkjilldi is quite certainly not 

 specifically distinct. 



H. Tryphaena Malmi, Boeck. 



fPl. 7). 

 ^Trt/phrnta Malmi, Boerk, Crust. Ainphip. borealia et arctira, p. '.i. 



Syn : T. Nordenskjoldi, Bovnll. = ^f. 

 T. Boccl-i, Stebhing -- <^. 



Cephalon about half the length of the mesosome. front in female 

 obtusely rounded, in male angularly produced; ocular pigment rounded oval 

 in male somewhat narrowed dorsally. Mesosome not very tumid, nearly as 

 long as the metasome. First pair of antennae with the 2nd joint of the 

 fiagellum in female linear compressed and about the length of the peduncle and 

 1st joint of the tiagellum combined, obliquely truncated at the extremity and 

 bearing 4 sensory appendages; in male much narrower and ciliated on the 

 posterior edge, the spiniform process about as long as the terminal joint, the 

 latter in both sexes scarcely longer than the sensory appendages. Anterior 

 gnathopoda with the basal joint about as long as the remainder part of the 

 leg, propodal joint compressed oval, bearing a short spine on either edge. 

 and produced at the tip, beneath the dactylus. to a short tooth-like proce<- 

 Posterior gnathopoda more slender than the anterior ones, outer part very 

 hairy, propodal joint narrow and as long as the dactylus. All the perem 

 poda, saving the last pair, having the propodal joint produced at the tip 

 beneath the dactylus to a short tooth-like process; 3rd pair about as long- 

 as the mesosome. Basal joint of the 2 posterior pairs of pereiopoda con- 

 siderably more expanded in male than in female. Urosome about as long as 

 the last segment of the metasome, rami of the uropoda snbequal. Tols.m in 

 male somewhat larger than in female, slightly exceeding the basal part of 

 the last pair of uropoda, Colour more or less reddish, speckled with small 

 purplish pigmentary spots. Length of adult female f> mm, of male <i nun. 



Jlntutrfo. The habitus-figure of the female given by Boeck in hi< 

 work on the Scandinavian Amphipoda is very had and misshaped, and this 

 may have been the cause why Dr. Bovallius could not recognise the specimen 

 examined by him as the male of T. Malmi. True, the sexual differences in 

 this form are rather striking, not only as regards the structure of the antenna-, 

 but also in several other points; but on a closer comparative examination of 

 both sexes, their specific identity cannot be misunderstood. The form described 



