278 



broad, and armed with 2 or 3 pairs of strong dorsal denticles, tip obtusely 

 pointed. Colour in the living state of the animal not yet stated. Length 

 of the specimen examined 5 mm. 



Remarks. The present new species is very markedly distinguished 

 from any of the other known forms, by the rather deviating structure of 

 both pairs of gnathopoda. The only specimen examined showed itself, by 

 dissection, to be a male, probably not yet sexually developed. 



Occurrence. - The above described specimen was found among some 

 Stenothoidse collected by me, some years ago, at Hammerfest, Finmark. 



27. Metopa longimana, Boeck. 



(PI. 97, fig. 1). 



Metopa lonijimana, Boeck, Crust, amph. bor. & arctica p. 64. 



Body rather strongly built, with firm integuments and very large 

 coxal plates. Cephalon not quite twice as long as the 1st segment of 

 mesosome, lateral corners somewhat projecting, and distinctly angular at 

 the tip. Second pair of coxal plates somewhat expanded in their outer part, 

 anterior edge abruptly curved in the middle; 3rd pair more than twice as 

 deep as the corresponding segment; 4th pair of quite unusual size, and nearly 

 completely covering the 3 succeeding pairs, obliquely triangular in form, much 

 broader than they are deep, distal edge nearly straight, posterior extremity 

 bluntly rounded. Last pair of epimeral plates of metasome not much produced 

 at the lateral corners, which however are distinctly angular at the tip. Eyes 

 of moderate size, rounded. Antennae in female nearly equal-sized and some- 

 what exceeding in length Vs of the body, in male somewhat unequal, the 

 inferior ones being the larger. First joint of the superior ones longer than 

 the cephalon, but somewhat shorter than the 2 succeeding joints combined, 

 flagellum not attaining the length of the peduncle, and composed of about 

 8 articulations. Inferior antennae with the last joint of the peduncle much 

 shorter than the penultimate one, flagellum about the length of the latter. 

 Anterior gnathopoda rather feeble, but of quite normal appearance, meral joint 

 produced at the end inferiorly to a setiferous projection, propodos shorter than 

 the carpus, and scarcely dilated in the middle. Posterior gnathopoda in female 

 moderately strong, propodos rather elongated and gradually expanded distally, 

 palm somewhat oblique, and defined below 03' a rather projecting dentiform 

 process, its edge nearly straight and slightly serrated, dactylus comparatively 

 short and strong. Same legs in male considerably larger than in female, 

 propodos still more elongated, palmar edge bisinuated inferiorly. Pereiopoda 

 successively diminishing in length posteriorly, 1st pair very elongated and 



35 Crustacea. 



