___98 



Occurrence. — 1 have met witli this species in 2 widely distant locali- 

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

 fjfird at Yennses, in both places at a very considerable depth. In the last 

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

 from a dead tisli fastened on a tishing line, let down in a depth 

 of about 150 fathoms. It here occurred in com[)any with 2 other species of 

 the genus, viz., H. cicada and H. aCKfu-t, and could with the greatest ease, 

 even b}' the naked eye, be distinguished from either of tliese species, on account 

 of its whitisli eyes and somewliat different coloration of the liody. Xo 

 intermediate forms between the aljove described very closely allied species 

 have as vet occurred to me. 



43. Hoplonyx caeculus, (l. 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 aljout twice as deep as tlie Ijody; 1st 

 pair .scarcelv^ tapering below; 4th pair with the posterior expansion short 

 and broad, obtusely truncated at the tip; 5th pair comparatively 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 deju'essed 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. Su^jerior 

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

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

 aiul 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 frona the latter by a distinct inden- 

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

 joint appears somewhat less elongated tlian in the other species, projjodos 

 about the lengtli of the carpus, palmar edge very obll([ue, finely denticulated 

 and defined below by an obtuse angle. Posterior gnatliopoda witli the pro- 

 podos ol)long oval, considerably exceeding half tlie length of the carpus, pal- 

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

 lus long and narrow, the 2 posterior ])airs of about equal length ; basal joint 



