552 



the anterior, and having the basal joint fringed on both edges with long 

 ciliated setse. Posterior gnathopoda in male very strongly built, with the 

 carpus much tumefied. The 2 anterior pairs of pereiopoda, but especially 

 the 1st pair, densely setous, with the propodal joint very narrow and 

 conically tapering. The 3 posterior pairs of pereiopoda successively increasing 

 in length, and having the basal joint rather expanded. Uropoda compara- 

 tively strongly built; last pair rather short and stout, with the rami some- 

 what unequal and strongly spinulose. Telson rounded. 



Reniarls. — This genus established in the year 1842 by Kroyer, is 

 chiefly distinguished from the preceding genera by the different mutual 

 relation of the gnathopoda, the posterior ones being the larger, and in male 

 very strongly built. It comprises as yet but a single species, to be 

 described below. 



8. Protomedeia fasciata, Kroyer. 



(PI. 196.] 



Protomedeia fasciata, Kroyer, Nat. Tidsskr. IV, p. 154. 



■Syn.: Gammarus maeronys, Lilljeborg. 

 > Antonog macronyx, Bruzzelius. 

 » Microdeutopus macronyx, Sp. Bate. 



Body rather slender, but scarcely compressed, the back being broadly 

 rounded; 2nd segment of mesosome in male much larger than in female. 

 Cephalon somewhat attenuated in front, with the lateral corners but little 

 projecting, and angular anteriorly, postantennal ones well defined. Anterior 

 pairs of coxal plates in female scarcely as deep as the corresponding seg- 

 ments, 1st pair subrhomboidal in form, and densely fringed with bristles, 

 being somewhat more expanded in male, 2nd pair in female of same shape 

 as the 2 succeding pairs, in male rather broad and having the distal edge 

 strongly curved, 5th pair in female with the anterior lobe evenly rounded, 

 and but little deeper than the preceding pair, in male of a rather different 

 form, having the anterior lobe very deep, and subtruncated at the tip. Last 

 pair of epimeral plates of metasome rounded at the lateral corners. Eyes 

 very small, rounded oval, with black pigment. Superior antennae scarcely 

 exceeding half the length of the body, 2nd joint of the peduncle about 

 the length of the 1st, but much narrower, flagellum not quite twice as 

 long as the peduncle, and composed of about 14 articulations, accessory 

 appendage twice the length of the last peduncular joint, and 5-articulate. 



