72 



dactylus extremely small. Posterior gnatliopoda slender and only sparingly 

 setous, propodos narrow linear, angularly produced at the tip beneath the mi- 

 nute dactylus. Pereiopoda short and stout, with the dactylus very small, basal 

 joint of the 3 posterior pairs large and laminar. Last pair of uropoda extreme- 

 ly small, rami much shorter than the basal part and nearly bare. Telson 

 small, sqvamiform, entire. 



Remarks. - - 1 have thought fit to establish this new genus soas to include the 

 following small Lysianassid, referred by Boeck to his genus OrcJwmene, but 

 differing in several points rather markedly so as more property to be generically 

 separated. The small size of the dactylus on the several legs has given rise 

 to the generic name here proposed. 



27. Nannonyx Goesii, (Boeck). 



(PI. 24, fig. 3) 

 Orchomene Goesii, Boeck, Crust, amphip. bor. & arct. p 36. 



Body rather thickset, with broadly rounded back. Cephalon much 

 shorter than the 1st segment of mesosome, lateral corners somewhat produced 

 and broadly rounded at the tip. Anterior coxal plates more than twice as 

 deep as the body; 1st pair obliquely truncated at the tip; 4th pair only very 

 slightly emarginated behind, infero-posterior corners obtusely rounded; 5th 

 pair rather large, a little more deep than broad. Metasome scarcely as long 

 as the 3 posterior segments of mesosome combined, last pair of epimeral pla- 

 tes nearly rectangular, posterior edge slightly crenulated. Urosome very short, 

 1st segment with a hump-like dorsal projection. Eyes of moderate size, oval, 

 pigment dark brown. Superior antennae with the 1st joint of the peduncle 

 very large, fully twice the length of the other 2 combined; flagellum only 

 half the length of the peduncle and composed of 4 articulations only, the 

 1st of which is rather thick at the base and about as long as the other 3 

 combined, all the joints provided with unusually coarse sensitive bristles ; access- 

 ory appendage about half the length of the nagellum and biarticulate, In- 

 ferior antennae rather feeble, with the flagellum about as long as the pen- 

 ultimate peduncular joint and 4-articulate. Anterior gnatliopoda very power- 

 ful, propodos obpyriform and about the length of the carpus, but much nar- 

 rower. Posterior gnathopoda with the propodos about half the length of the 

 carpus and very narrow. Basal joint of the 3 posterior pereiopoda rounded 

 oval and about as long as the remainder part of the leg, meral joint rather 

 expanded posteriorly. Last pair of uropoda with the inner ramus extremely 

 small, about half the length of the outer and simple mucroniform. Telson 



