95 



40. Hoplonyx acutus, G. 0. Sars, n. sp. 



(PI. 33, fig. 2). 



Body somewhat more robust than in the last species, with broadly 

 rounded back. Cephalon about the length of the 1st segment of mesosome, 

 lateral corners greatly prodiiced and acuminate at the tip. Anterior coxal 

 plates scarcely twice as deep as the body, but considerably broader tlian in 

 the 2 preceding species; 1st pair not tapering below, anterior edge concaved; 

 the 2 succeeding pairs widening distally; 5th pair considerably expanded in 

 their lower part and projecting posteriori}^ as a rather narrow obtusel}' acu- 

 minated lobe; 5th pair a little more broad than deep. Last pair of epimeral 

 plates of metasome rectangular, lateral corners but very slightly produced, 

 posterior edge nearly straight. First segment of urosome not distinctly depres- 

 sed dorsally. Eyes about as in H. similis. Superior antennae, in female 

 rather slender, flagellum about twice the length of the peduncle and composed 

 of about 15 articulations, the 1st of wliich is rather large, almost equalling 

 in length the 5 succeeding ones combined; accessory appendage nearly lialf 

 the length of the flagellum and 6-articulate. Inferior antennae distinctly 

 longer than the superior, flagellum composed of about 24 articulations. An- 

 terior gnathopoda with the propodos somewhat longer tham the carjjus, pal- 

 mar edge nearly straight and defined below by an obtuse angle. Posterior 

 gnathopoda with the propodos fviUy half the length of the carpus, somewhat 

 dilated distally and obliquely truncated at the tip, dactylus stronger than 

 usiial. Pereiopoda about as in the 2 preceding species. Last pair of uropoda 

 with the rami nearly equal in length. Telson rather narrow, fully twice as 

 long as broad and having 2 pairs of dorsal denticles. Colour pale yellowish 

 with a faint reddish tinge ; ova in the marsupial pouch orange-coloui'ed. 

 Length of adult female 13 mm. 



llemarlis. — The present s])ecies may be readily distinguished by the 

 greatly projecting and acuminate lateral corners of the ceplialon, as also by 

 the form of the 4 anterior ])airs of coxal plates and of the last epimeral 

 plates of the metasome. Otherwise it is very nearly allied to the 2 preced- 

 ing species. 



Occurrence. — Last summer I collected several specimens of this foi'm, 

 botli male and female, in the Trondhjemsfjord atVennses. They were picked 

 up from a dead fish fastened on a fishing line let down in a de])tli of aljout 

 150 fathoms. It would also seem to occur off the west coast of Norway, as 

 I have found some specimens among the vast material of H cicadn I col- 

 lected in diflerent localities and at ditferent times, but the exact locality I 

 cannot yet state with certainty. 



