72 



dactylus extremely small. Posterior gnathopoda slender and only sparingly 

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

 nute dactylus. Pereiopoda shoi't and stout, with the dactj'lus verj' small, basal 

 joint of the 3 po.sterior 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. 



Bemarlis. — I have thouglit fit to establish this new geniis soas to include the 

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

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

 separated. The small size of the dact^'lus on the several legs has given rise 

 to the generic name here proposed. 



27. Nannonyx Goesii, (Boeck). 



(PI. 24, fig. 3J 

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



Body rather thickset, with broadly- rounded l^aek. Cephalon much 

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

 and broadl3- rounded at the tip. Anterior coxal plates more than twice as 

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

 slightlj' emarginated behind, infero-posterior corners obtixseh- I'ounded; 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 ejjimeral }>Ia- 

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

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

 jiigment dark brown. Superior antenna? with the 1st joint of the peduncle 

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

 half tlie length of the peduncle and composed of 4 articulations onh-, 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 ilagellum and biarticulate. In- 

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

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

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

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

 carpus and ver^' narrow. Basal joint of the 3 posterior pereiojjoda rounded 

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

 expanded posteriorly. Last pair of uro])oda with the inner ramus extremely 

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



