108 



the remainder part of the leg. Last pair of uropoda with both rami quite 

 naked, the inner the shorter. Telson rounded oval, a little more long than 

 broad, posterior incision narrow and not nearly extending to the middle, ter- 

 minal lobes indented at the tip. Colour (according to Kroyer) reddish yellow, 

 the back being somewhat darker. Length of adult female 8 mm. 



Remarks . This species, first described by Kroyer, is at once 



distinguished from any of the 2 preceding ones by the peculiar robust form of 

 the 3 posterior pairs of pereiopoda, in which respect it shows a perplexing 

 resemblance to another rather different Lysianassid, viz., Meni grates obtusifrons 

 (Boeck) to be described in the sequel. This apparent resemblance has indeed 

 caused the two forms to be often confounded with each other, as will be 

 shown farther on. 



Occurrence. - I have not myself met with this species, but a few 

 specimens are preserved in our University Museum, collected by Boeck off the 

 West coast of Norway at Haugesund. 



Distribution. - Arctic Ocean: Greenland, Spitsbergen, the Murman 

 Coast, the Kara Sea, the Siberian Polar Sea (Stuxberg); Bohuslan (Stock- 

 holm Museum). 



Gen. 27. ChironesimUS, G. 0. Sars, n. 

 Syn : Anonyx, Hoek (ex parte). 



Body thickish, with comparatively large coxal plates; the last 

 pair of epimeral plates of metasome produced at the lateral corners. Antennae 

 (in female) about as in Onesimus, the inferior ones being a little longer than 

 the superior. Epistome not at all projecting. Anterior lip forming in front 

 a rather large and compressed ling-triform lobe. Mandibles of moderate size, 

 cutting edge with a secondary tooth on the inner corner, molar expansion 

 tapering to a blunt ciliated point, palp rather large and originating somewhat 

 nearer the tip than does the latter. First pair of maxillae with the mas- 

 ticatory lobe large and obliquely truncated, terminal spines rather strong and 

 denticulated, basal lobe comparatively small and bisetose, palp normal. Second 

 pair of maxillae with the lobes rather short, the outer the larger. Maxilli- 

 peds with the masticatory lobe broadly oval and scarcely reaching to the 

 end of the antepenultimate joint of the palp; the latter of usual structure. 

 Anterior gnathopoda comparatively short and distinctly subcheliform. Posterior 

 gnathopoda elongated and rather powerful, propodos greatly expanded, with 



