412 Annals of the South African Museum. 



spiniform processes. All the segments with a medio- ventral, straight, 

 spiniform process. 



Pleori a little longer than broad, lateral margins convex proximally, 

 concave distally, with a few minute setules, postero-lateral angles 

 quadrate, distal margin very slightly produced. 



Antenna 1 rather more developed than usual in the genus, stout, 

 the 3 peduncular joints not differing greatly in size, flagellum 2-jointed, 

 1st shorter, 2nd longer than any of the peduncular joints, both joints 

 with apical tufts of long filamentous sensory setae. 



Antenna 2, first 8 joints short, 4th long and slender, 5th a little 

 shorter than 4th, flagellum very slender, a little longer than 4th joint, 

 ca. 10-jointed. 



Mouth-parts normal, as figured by Sars for M. spinifera. (Crust. 

 Norw. vol. 2, pi. 51.) 



Peraeopod 1 as in spinifera, but 5th joint subequal to 3rd and 7th 

 only half length of 6th. 



Peraeopod 2 as in spinifera, but 3rd and 4th joints with setae on 

 lower apices, 5th slender and equal to 3rd. 



Peraeopod 3 similar to that of M. longiremis (Mein.) (Sars, I.e. 

 Suppl. pi. 2), but 5th joint narrower in proportion to width of 4th, the 

 armature of the joints the same. 



Peraeopod 4 as in longiremis but 5th joint relatively narrower. 



Peraeopods 5 and 6 as in spinifera. 



Peraeopod 7 as in spinifera but 5th joint ^ as long again as 2nd, 

 6th J as long again as 2nd, 7th plus uuguis | length of 6th. 



Pleopod 1 in <$ , peduncles indurated, narrow, tapering slightly to 

 subacute apices, rami narrow, projecting beyond apices of peduncles, 

 slightly expanding, apices rounded and setulose. 



Pleopod 2 in $ , peduncle indurated, narrow, slightly curved, the 

 inner margin being concave, outer margin distally serrulate, with a 

 plumose seta arising from each notch, stylet reaching to, but not 

 beyond, apex of peduncle, basal joint stout, 2nd joint proximally 

 stout then narrowing rapidly to a fine point, outer ramus apparently 

 absent. 



Uropods lost. 



Length: 3 mm. ; breadth: 75 mm. 



Colour : In spirit chalky white. 



Locality: Cape Point N. 89 E., distant 36 miles. 700 fathoms. 

 1 $. s.s. "Pieter Faure." 20/8/03. (S.A.M. No. A4132.) 



This species is easily distinguished from the other three species 

 of the genus by the spinous processes of the head and the greater 

 development of the 1st antennae. 



