same family, and as that author lias made the Hyperids his special study, 

 1 do not feel at ])resent entitled to dissent from liis opinion on this 

 ])oint. In tlie restrieted sense in wliirli tlie genus is taken by Bovallins, it 

 only contains a single speeies, for tlie T. Nordens^lijoldi is quite eertainly not 

 speoitieally distinct, 



s. Tryphaena Malmi, Boeck. 



(PI. 7 J. 

 ^Trt/phdiiii Mnhni, Boeuk, Crust. Amphip. borealia et arctica, p. 9. 

 Syn: T. Niwlcmlijohli, Bov.ill. = (j". 

 } T. Borcki. Stebbing = c?- 



Cei)lia]oii about half the length of the mesosonie, front in female 

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

 in male somewhat narrowed dorsally. Mesosome not veiy tiimid, nearly as 

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

 tiagellum in female linear c(nn]n'essed and about the length of the peduncle and 

 1st joint of the tiagellum combined, iiblii|uely truncated at the extremity and 

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

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

 latter in both .sexes scarcely longer than the .sensory appendages. Anterim- 

 gnathopoda with the basal joint about as long as the remaindei' part of the 

 leg, propodal joint i^ompressed oval, beai'ing a short spine on either edge, 

 and produced at the ti]!. beneath the dactylus. to a short tooth-like process. 

 Posteri<ir gnatliopoda more slender than the anterior ones, outer part very 

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

 poda, saving the last pair, having the propodal joint jiroduced at the tiji 

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

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

 siderably moi'e expanded in male than in female. Urosome about as long as 

 the last segment of the metasome, rami of the uropoda subequal. Telson in 

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

 the last ])air of ui-opoda, Colour more or less reddish, .speckled with snmll 

 ])ur]ilish ]ngmentary spots. Length <if adult female o mm, of male (i mm. 



ItcDKirl'f:. — The habitus-tigure of the female given by Boeck in his 

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

 may liave been the cause why Dr. Bovallins could not recognise the specimen 

 examined by him as the male of T. Malmi, Ti-ue, the sexual differences in 

 this form are rather striking, not only as regards the struc^ture of the antennae, 

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

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



