2i 4 DISCOVERY REPORTS 



Peraeopods i and 2 moderately slender. Peraeopods 3-5 moderately slender, 2nd 

 joints expanded, oblong, about twice as long as broad, anterior and posterior margins 

 subparallel in peraeopods 3 and 4, in peraeopod 5 posterior margin more convex, the 

 width of the joint consequently more than half its length, postero-inferior angles in 

 peraeopods 3 and 4 subquadrate, scarcely produced, in peraeopod 5 also subquadrate 

 but produced in a lobe extending to end of 3rd joint, hind margin in all three peraeopods 

 feebly serrate, 4th and 5th joints subequal. 



Uropods 1 and 2, rami extending about equally far back, to a little beyond end of 

 telson or end of peduncle of uropod 3. Uropod 3 in both sexes, rami very elongate, 

 especially in <$, longer than 2nd joint of peraeopod 5, nearly five times as long as ped- 

 uncle, narrow, outer slightly longer than inner, apices truncate, with strong spines, 

 margins, especially outer margin of outer ramus, spinulose. In no. 1 juv. the rami do 

 not extend beyond rami of uropod 1, but in the young <$ of no. 2 they are elongate. 



Remarks. In naming this species, the first true Maera to be recorded from the 

 Antarctic, after Dr Georg Pfeffer, I return the compliment he paid to the English 

 carcinologist E. J. Miers when he described " Megamoera" miersii, the first known 

 Antarctic member of the family Gammaridae. 



This species forms the counterpart to M. loveni (Bruz.) from the Arctic Ocean. In 

 its slender body it bears a close resemblance both to loveni and also to hirondellei, Chevr. 

 (1900, p. 84, pi. xi, fig. 1) ; with the latter it has in common the peculiar apical projection 

 on the 5th joint of gnathopod i 1 ; and also the same type of hand in gnathopod 2, at 

 least in the <?• It is, however, easily distinguished by the enormously elongate rami of 

 uropod 3 in S, a feature it has in common with Paroceradocus miersii (Ph.) 



Maera ascensionis, n.sp. (Fig. 132). 



Occurrence: St. 1. Ascension. 4 <J<J 4-5 mm., 4 immat. SS 3'5 mm > l ovi §- ? 4 mm - 



Description. Eyes oval or subcircular. Peraeon and pleon not dorsally dentate. 

 Side-plates entire on lower margins. Postero-inferior angle of pleon segment 3 quadrate, 

 with a small point. 



Antenna 1, accessory flagellum 7-8-jointed. 



Gnathopod 1, 5th joint in $ with slight subapical depression on upper margin, apex 

 slightly produced over base of 6th joint (cf.pfefferi, and footnote, infra). Gnathopod 2 

 in S, 6th joint oblong, nearly twice as long as broad, palm a little oblique, defined by 

 two spiniform teeth, two small spines within the angle, one broad semicircular excision 

 separated from a narrower excision nearer the hinge by a bifid tooth bearing two spines, 

 a subtruncate spiniferous tooth near hinge, finger sinuate on inner margin. In immature 

 J the hand is narrower, palm more oblique, and the excisions not so deep. In ? the hand 

 widens slightly to the oblique, convex, crenulate palm, which is defined from the hind 

 margin by an obtuse angle, but no projecting tooth or spine. 



Peraeopods 1 and 2 slender. Peraeopod 3, 2nd joint ovate, produced behind to end 



1 This occurs also in Kunkel's (1910) figures of M. rathbunae, and also to a less extent in his figure of 

 inaequipes, as well as in Chevreux and Fage's (1925) figure of inaequipes. 



