564 



13. Megamphopus cornutus, Norman. 



(PI. 200). 



Megamphopus cornutus, Norman, Last Report on Dredging among (lie Shetland Isles: Report 

 of the Brit. Assoc, f. the Advanc. of Science, p. 282, 



Syn: Protomedeia longimana, Boeck. 



Body rather slender, though scarcely compres.sed, being somewhat 

 tumid in the female. Cephalon exceeding in length the first 2 segments of 

 mesosome combined, frontal part very much produced, lateral corners acut- 

 angular, postantennal ones far behind the latter. Anterior pairs of coxal 

 plates in female about as deep as the corresponding segments, and rounded 

 quadrangular in form; 5th pair with the anterior lobe nearly as deep as tlie 

 preceding pair, and evenly rounded. Coxal plates in male somewhat differing 

 from tliose in female; 1st pair produced in front to an acuminate projection, 

 which is sometimes deflexed in the form of a horn; 2nd pair much larger 

 than any of the others; the 2 succeeding pairs successively diminishing in 

 size. Last pair of epimeral plates of metasome obtusely rounded at the 

 lateral corners. Eyes rather large, oval in form, and placed on each side 

 of the frontal part of the cephalon, pigment dark brown. Superior antennee 

 not nearly attaining half the length of the body, 1st joint of the peduncle 

 comparatively short and thick, being about half as long as the cephalon, 2nd 

 joint considerably longer and much narrower, 3rd joint about the length of 

 the 1st, flagellum scarcely longer than the peduncle, and composed of about 

 8 articulations, accessory appendage extremely small and uniarticulate. 

 Inferior antennae somewhat longer than the superior, with the flagellumi 

 exceeding half the length of the peduncle. Both pairs of antennae provided 

 along their posterior edge with tufts of slender bristles. Anterior gnathopoda 

 in female rather feeble, with the propodos about the length of the carpus, 

 and slightly dilated in the middle, being oblong subfusiform in outline, 

 dactylus rather slender. Posterior gnathopoda but little larger than the 

 anterior, propodos oblong in form, and gradually tapering distally, without 

 any distinct palm. Both pairs of gnathopoda in male much larger than in 

 female, and rather elongated ; the anterior ones having the carpus nearly as 

 long as the basal joint, and provided below with sevei'al fascicles of bristles, 

 and anteriorly with an obtuse dentiform projection, propodos shorter than 

 the carpus, and oblong oval in form, lower edge armed with a series of 



