70 



26. Orchomenella groenlandica (Hansen). 



(PL 26, fig. 1.) 

 Anonyx groenlandicus,Ha-nsen, Malacostraca marina Grdnlandise occidentalis. p. 72, PI. II, fig. 5. 



Body less robust than in the other species of the genus. Lateral 

 corners of cephalon slightly projecting and snbangnlar at the tip. First pair 

 of coxal plates much smaller than the succeeding ones, tapering inferiorly and 

 having the anterior edge concaved; the 3 succeeding pairs about twice as 

 deep as the body; 4th pair rather expanded below; 5th pair comparatively 

 small, rounded, more broad than deep. Last pair of epimeral plates of meta- 

 some produced at the infero-lateral corners to a short upturned dentiform pro- 

 jection, posterior edge arcuate. First segment of urosome deeply depressed 

 dorsally, and exhibiting below the depression a projecting carina terminating 

 with a sharp point. Eyes oval, widening below, visual elements imperfectly 

 developed, pigment dark red, with an opaque whitish coating. Superior an- 

 tennse with the peduncle short and thick, flagellum nearly twice its length 

 and composed in female of 8, in male of about 14 articulations, the 1st of 

 which is rather large; accessory appendage half the length of the flagellum, 

 4-articulate, 1st joint longer than the other 3 combined. Inferior antennae in 

 in female scarcely longer than the superior, in male somewhat more elongated, 

 though not nearly twice as long. Epistome considerably projecting in front of 

 -the anterior lip, and evenly rounded. Mandibles somewhat stronger than in 

 the other species, but otherwise of a quite similar structure. Anterior gnatho- 

 poda with the propodos as long as the carpal and meral joints combined, ob- 

 long quadrangular, nearly of uniform breadth throughout, palmar edge trans- 

 versely truncated. Posterior gnathopoda rather slender, propodos half the 

 length of the carpus, gradually widening distally and angularly produced be- 

 neath the minute dactylus. Pereiopoda of moderate length, basal joint of the 

 3 posterior pairs rather large and laminar. Last pair of uropoda in female 

 with the inner ramus nearly as long as the outer, the latter whithout any 

 setae ; in male somewhat larger, with both rami setous on the inner edge. 

 Penultimate pair of uropoda in both sexes with the inner ramus indented 

 near the tip and bearing immediately above the indentation a long spiniform 

 seta. Telson oblong oval, nearly twice as long as broad, gradually tapering 

 distally, with 2 pairs of dorsal denticles, cleft very narrow and extending 

 beyond the middle. Colour whitish, pellucid. Length of adult female 7 mm. 



Remarks. At first I believed this form to be the Lysianassa Mar- 

 tensi of Groes, exhibiting, as it does, some points of apparent agreement; but, 

 having had recently through the kindness of Prof. Loven an opportunity of 

 examining the type specimens of the Stockholm Museum, I find the form so 



