96 



41. Hoplonyx albidus, G-. 0. Sars, n. sp. 



(PI. 33, fig. 3.) 



Body rather short and stout, though somewhat compressed. Cephalon 

 about the length of the 1st segment of mesosome, lateral corners but very 

 little projecting and nearly rectangular. Anterior coxal plates rather large, 

 more than twice as deep as the body ; 1st pair tapering below, with the 

 extremity narrowly rounded; 4th pair with the posterior expansion rather 

 short and broad, obliquely truncated at the tip ; 5th pair about as deep as 

 broad. Last pair of epimeral plates of metasome rectangular, not at all 

 produced at the lateral corners, posterior edge straight. First segment of 

 urosome deeply depressed at the base dorsally. Eyes much larger than in 

 any of the other species and less distinctly sigmoid in form, visual elements 

 indistinct, pigment light red. Superior antenna? in female comparatively less 

 slender than in the 2 preceding species, flagellum not quite half the length 

 of the peduncle and composed of about 15 articulations, the 1st of which 

 somewhat exceeds in length the 3 succeeding ones combined ; accessory appen- 

 dage about half the length of the flagellum and 8-articulate. Inferior antennae 

 considerably longer than the superior, flagellum composed of about 28 articu- 

 lations. Epistome considerably projecting in front of the anterior lip and 

 obtusely angulated. Anterior gnathopoda somewhat less elongated than in 

 the other species, propodos scarcely longer than the carpus, palmar edge 

 indistinctly denned below. Posterior gnathopoda with the propodos rather 

 narrow, not widening distally and exceeding the half length of the carpus, 

 dactylus rather small. Pereiopoda comparatively shorter than in the preced- 

 ing species, especially the 3 posterior pairs, the basal joint of which is very 

 large, nearly equalling in length the remainder part of the leg. Last pair 

 of uropoda with the rami somewhat broader than in the other species, the 

 inner shorter than the outer. Telson likewise broader, not twice as long as 

 broad, and having 2 pairs of dorsal denticles. Colour uniformly whitish, 

 without any reddish tinge ; ova in the marsupial pouch bright red. Length 

 of adult female 12 mm. 



Remarks. - This form may be easily distinguished from the other species 

 of the genus by its comparatively robust body, the form of the cephalon, 

 the unusually deep coxal plates, the absolute want of any projection on the 

 last pair of epimeral plates of the metasome, and the deep dorsal impres- 

 sion on the 1st segment of the urosome. In its living state it is moreover 

 at once recognised by its uniform whitish colour and the very large 

 bright red eyes. 



