97 



Occurrence. - I have only met with this pretty species in the region 

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

 seem to occur in several places off the West coast of Norway and so far 

 North as Selsovig in Nordland, lying exactly in the latitude of the polar 

 circle. In the Trondhjemsfjord I have found it in g Tea t abundance, especially 

 in the steep slope of the bottom where the Pamyorgia arlorea grows. 



4-2. Hoplonyx leucophthalmus, G. 0. Sars, n. sp. 



(PI. 34, fig. 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 about twice as deep as the body and successively increasing 

 in size posteriorly; 1st pair narrowly rounded at the tip; 4th pair with the 

 posterior 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 sharp point. First segment of urosome but slightly 

 depressed dorsally. Eyes narrow, sigmoid in form and without any distinct 

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

 whitish. Superior antennae 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 

 equals in length the 4 succeeding ones combined ; accessory appendage scarcely 

 attaining one third of the length of the nagellum and (J-articulate. TCpistome con- 

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

 gnathopoda rather slender, propodos about the length of the carpus, palmar 

 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- 

 timate pair the longest. Last pair of uropoda with the inner rainiis shorter 

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

 single pair of dorsal denticles. Colour pale reddish yellow, with a more 

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

 female 15 mm. 



Remarks. - In the living state this form is at once reeogni/ed from 

 any of the other species by its light coloured, nearly pure whitish eye-, which 

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

 details it otherwise exhibits a very close relationship to If. 



