226 Annals of the South African Museum. 



2nd joint broader than long, 3rd joint with acute projection on upper 

 side covering the junction of the 4th joint, which consequently 

 appears to be sunk in the 3rd, outer margin of 3rd joint with small 

 but distinct and movable scale bearing 2-3 apical spines, inner 

 margin slightly convex with 1 strong outstanding spine, 4th joint 

 also hollowed out beneath to receive the 5th joint, 5th and 6th joints 

 and the flagellum not preserved intact on any of the specimens, 5th 

 joint measures 17 mm., the 6th joint 14 mm., and the flagellum 

 30 mm., 6th joint about as slender as peraeopods 2-4, 5th joint a 

 little stouter. 



Upper lip as broad as long, proximal portion triangular and 

 forming a low blunt tubercle, distal margin evenly and rather flatly 

 rounded, minutely hirsute. Epistome strongly calcined, semicircular, 

 embracing the proximal half of labrum. 



Lower lip, outer lobes broad, apices bluntly rounded, inner margin 

 densely fringed, inner lobes well developed. 



Mandibles, cutting-edge bilobed in left, entire in right, molar 

 stronger than in M. arcticus, with small brush of setae. 



First maxilla, outer lobe with 12 spines, some of them minutely 

 serrate on outer margins, inner lobe with incurved apex bearing 

 2 long spine-setae and numerous fine setules. 



Second maxilla, outer and middle lobes similar, bearing long 

 curved spine-setae, serrate on inner margins, inner lobe twice as 

 broad with 16-18 rather shorter doubly-serrate spine-setae. 



Maxillipeds, 4th joint largest, 5th joint with outer margins short, 

 inner margin expanded but not sharply produced, 6th joint strongly 

 expanded internally, 7th joint slender and a little shorter than 6th, 

 inner plate squarely truncate, with apical plumose setae and 8 

 coupling-hooks near the base, epipod reaching half-way along 4th 

 joint, lanceolate, apically pointed, inner margin nearly straight, 

 outer convex and distally oblique. 



First peraeopods a little longer than body, 5th joint the longest, 

 6th joint two-thirds length of 5th, 7th joint about one-seventh length 

 of 6th. 



Second, third and fourth peraeopods very long, about 2J times 

 length of body, 6th joint twice length of 5th, 7th joint one-quarter 

 length of 6th, biunguiculate. 



Marsupial plates developed on peraeopods 1-4, not meeting in the 

 middle line, except in the ovigerous 5 , where the 2nd 3rd and 4th 

 pairs are greatly enlarged. 



Fifth, sixth and seventh peraeopods, 5th joint strongly expanded 

 posteriorly, narrowing rapidly distally, 6th joint symmetrically ovate, 



