98 



Occurrence. I have met with this species in 2 widely distant locali- 

 ties, viz., in the inner part of the Hardangerfjord, at Utne, and in Trondkj ems- 

 fjord at Vennses, in both places at a very considerable depth. In the last 

 named locality numerous specimens, both male and female, were collected 

 from a dead fish fastened on a fishing line, let down in a depth 

 of about 150 fathoms. It here occurred in company with 2 other species of 

 the genus, viz., H. cicada and H. ac-uhts, and could with the greatest ease, 

 even by the naked eye, be distinguished from either of these species, on account 

 of its whitish eyes and somewhat different coloration of the body. No 

 intermediate forms between the above described very closely allied species 

 have as yet occurred to me. 



43. Hoplonyx caeculus, G-. 0. Sars, n. sp. 



(PI 35, fig. 1.) 



Body rather slender and compressed. Cephalon considerably longer 

 than the 1st segment ofmesosome, lateral corners produced to an acute rather 

 projecting point. Anterior coxal plates about twice as deep as the body; 1st 

 pair scarcely tapering below; 4th pair with the posterior expansion short 

 and broad, obtusely truncated at the tip ; 5th pair comparative^ 7 small, about 

 as deep as broad. Last pair of epimeral plates of metasome considerably 

 produced at the lateral corners, forming an acuminated projection. First seg- 

 ment of urosome distinctly depressed at the base dorsally and exhibiting 

 behind the depression a rounded carina, Eyes wholly wanting, not even the 

 slightest trace of pigment being present in the living animal. Superior 

 antennse about the length of the cephalon and the 2 first segments of meso- 

 some combined, flagellum not nearly attaining twice the length of the peduncle 

 and composed of about 11 articulations, the 1st of which is very large, about 

 equal in length to the 5 succeeding ones combined ; accessory appendage 

 exceeding half the length of the flagellum, very slender and 4-articulate, 1st 

 joint larger than the other 3 combined. Epistome scarcely projecting in front 

 of the anterior lip, though being defined from the latter by a distinct inden- 

 tation. Anterior gnathopoda of the usual slender form, though the ischial 

 joint appears somewhat less elongated than in the other species, propodos 

 about the length of the carpus, palmar edge very oblique, finely denticulated 

 and defined below by an obtuse angle. Posterior gnathopoda with the pro- 

 podos oblong oval, considerably exceeding half the length of the carpus, |;il- 

 mar edge transversely truncated. Pereiopoda rather slender, with the dacty- 

 lus long and narrow, the 2 posterior pairs of about equal length ; basal joint 



