77 



narrow, scarcely half as long as the flagellum and composed of 5 articulations, 

 the 1st of which does not exceed the succeeding- ones in length. Inferior an- 

 tenna? in female very little longer than the superior, flagellum '.(-articulate; 

 in male abont twice the length of the former. Epistomal plate not very pro- 

 jecting, obtusely angular in front. Anterior gnathopoda with the propodos 

 about the length of the carpus, palmar edge nearly transversely truncated. 

 Posterior gnathopoda with the propodos oval, scarcely narrower than the car- 

 pus, dactylus rather strong. Basal joints of the 3 posterior pairs of pereiopoda 

 successively increasing in size posteriorly. Last pair of uropoda with the 

 inner ramus scarcely longer than the basal joint of the outer. Telson oblong 

 oval, with 2 pairs of dorsal denticles, cleft extending far beyond the middle. 

 Body whitish, pellucid, with a few light reddish pigmentary spots. Length of 

 adult female scarcely exceeding 4 mm. 



Remarks. - The description of this and the following species given 

 by Boeck in his great work on the northern Amphipoda is in several points 

 incorrect and misleading as regards the specific distinction; on the other hand, 

 he was certainly right in removing both these species from the genus Anomj.i 

 and in referring them to a particular genus. The present species, which may 

 be regarded the type of this genus, is easily known from the other species 

 here discribed both by its small size and by the absolute want of any dorsal 

 projection on the 1st segment of the" urosome. 



Occurrence. - - Off Norway the species would seem to be restricted to 

 the south and west coasts. At least it has never yet been met with either 

 off the coast of Nordland or that of Finmark. It occurs, as a rule, in com- 

 paratively shallow water, from 6 to 20 fathoms, especially where the bottom 

 is sandy. 



Distribution. Denmark, Bohuslan, Shetland isles (Norman), coast of 

 France (Chevreux), Adriatic (Heller). - 



30. Tryphosa Horringii. Boeck. 



(PI. 27, fig. 2.) 

 Tryphosa Horingii, Boeck, Chrust. amphip. bor. & arct. p. 38. 



Body less compressed than in the preceding species, the back being broadly 

 rounded. Ceplialon about the length of the 1st segment of mesosome, lateral 

 corners rather projecting and obtusely rounded at the tip. Coxal plates rather 

 large, 1st pair less concaved anteriorly, 4th pair angularly produced posteriorly 

 in their lower part, 5th pair fully as deep as broad. Last pair of epimeral plates 

 of metasome rectangular, posterior edge slightly arched. First segment of 



11 Crustacea. 



