__97 



Occurrence. — I have only met with this pi'etty species in the region 

 of the deep sea corals at depths varying from 80 to 150 fathoms. It would 

 seem tn necur in several places off the West coast of Norway and so far 

 North as Selsovig in Nordland, lying exactlj' in the latitude of the ]>()lar 

 circle. In the Trondhjemsfjord I have found it in great abundance, especially 

 in the steep slope of the bottom where the Faragorgia arhorea grows. - 



42. Hoplonyx leucophthalmus, G. 0. Sars, n. sp. 



(PI. 34, %. 1.) 



Body considerably more slender than in the last species and rather 

 compressed. Cephalon a little longer than the 1st segment of mesosome, 

 lateral corners somewhat projecting and obtusely angular at the tip. An- 

 terior coxal plates abovit twice as deep as the body and successively increasing 

 in size posteriorly ; 1st pair narrowly rounded at the ti^j ; 4th pair with the 

 jiosterior expansion rather broad and obliquely truncated at the tip; 5th pair 

 about as deep as broad. Last pair of epimeral plates of metasome produced 

 at the lateral corners to a .sharji point. First segment of urosome but slightly 

 deju'essed dorsally. Eyes narrow, sigmoid in form and without any distinct 

 visual elements, so that they quite disappear in alcoholic specimens, jiigHient 

 wliitisli. Supei'ior antennaB in female rather slender, longer than the cephalon 

 and the 3 first segments of mesosome combined, flagellum nearly 3 times as long 

 as the peduncle and composed of about 18 articulations, the 1st of which 

 e(|uals in length the 4 succeeding ones combined; accessory appendage scarcely 

 attaining one third of the length of the flagellum and tj-articulate. Epistome con- 

 siderably projecting in front of the anterior lip and evenly rounded. Anterior 

 gnathojioda rather slender, propodos about the length of the carjms, palmai' 

 edge somewhat flexuous and defined below by an indistinct obtuse angle. 

 Posterior gnathopoda with the propodos short and broad, oval, not attaining 

 half the length of the carpus. Pereiopoda rather slender and elongated, penul- 

 tiumte pair the longest. Last pair of uropoda with the inner ramus shorter 

 than the outer. Telson not nearly twice as long as broad and having Ijut a 

 single pair of dorsal denticles. ( 'obnir pale reddish j'ellow, with a more 

 distinct pinkish tinge on the anterior part of the body. Length of adult 

 feuuile 15 mm. 



Itenuirls. — In the living state this form is at once recognized from 

 any of tlie otlier species by its liglit coloured, nearly pure whitish eyes, whicli 



are without anv trace of distinctly developed visual elements. In its anatomical 

 * ' . , . . . ... 



details it otherwise exhibits a very close relationship to H. simiJis. 



