65 



22. Orchomene amblyops, n. sp. 



(PI. 26, fig. 1). 



Body a little more slender than in the 3 previously described species. 

 Lateral corners of cephalon biit slightly produced and distinctly angular at 

 the tip. Coxal plates rather large, the 4 anterior pairs about twice as deep 

 as the body, 1st pair considerably expanded below and to a great extent 

 concealing the buccal mass laterally, 5th pair about as deep as broad. Last 

 pair of epimeral plates of metasome rounded at the infero-lateral corners, 

 posterior edge sligtly arched and regularly serrated, number of serrations 

 14 — IG. First segment of urosome with a very conspiciious triangular hump- 

 like dorsal projection, obtuse at the tip. Eyes oblong oval considerably 

 dilated below, visual elements imperfectly developed, pigment light orange- 

 coloured with a faint whitish reticulation. Antennte almost exactly as in 0. 

 serrafus. Epistoraal plate, on the other hand, considerably broader and 

 nearly of the same form as in 0. crispatus. Anterior gnathopoda somewhat 

 more slender than in 0. serrafus, propodos longer than the carpal and meral 

 joints combined, scarcelj^ at all tajiering, tip transversally truncated. Posterior 

 gnathopoda with the propodos much naiTower than in that species, and provided 

 with much coarser sjiiniform biistles. Pereiopoda comparatively more slender, 

 basal joint of the 3 posterior pairs not nearly so long as the remainder part 

 of the leg. Last pair of iiropoda with the inner ramus shorter tlian the 

 basal joint of the outer, the latter mth 3 leather slender ciliated sette on 

 the inner edge. Telson comparatively small, with 3 pairs of dorsal denticles, 

 cleft extending to about the middle and gradually widening posteriorly. 

 C'olour whitish with a faint tinge of yellow on the anterior part. Length of 

 adult female 8 mm. 



Hemarls. — This new species is intermediate in chaiacter between 

 0. scrrtitus and pecdnafiis. From the former it is distinguished by the com- 

 paratively short and angular lateral corners of the cephalon, the imperfectly 

 developed eyes, and the hump-like dorsal projection of the 1st segment of the 

 urosome ; from the latter b^^ the different form of the epistomal plate, the 

 less coarse serrations of the last pair of epimei'al plates of the metasome, 

 and by the more blunted form of the dorsal projection of the 1st segment of 

 the urosome. 



Occurrence. — I have met with this form in a few localities off the 

 west coast of Norway, and, besides, in the Trondhjemsfjord and at Apelvser 

 in Namdaleu. It is a true deep-water form, only occiirring in greater depths, 

 from 100 to 200 fathoms. 



