Contributions to the Crustacean Fauna of South Africa. 365 



of the 1st and 2nd antennae, and the spines on the 4th joint of the 

 lst-3rd peraeopods. Since the specimen is immature and only 

 the length of the smallest measurements given by the above authors, 

 these differences may be ascribed to difference in age as well as local 

 variation. 



The above description is rather detailed in order to facilitate com- 

 parison with European specimens, since the discovery of this 

 northern form in deep water off the South African coast bears on 

 the interesting question of Bipolarity. 



AEGA MONILIS, n. sp. 

 (Plate XXXI. C.) 



Body with the usual fine scattered punctation, glabrous. Head 

 with rostrum carving downwards but not completely separating 

 bases of 1st antennae, and not reaching the nodular, rhomboidal 

 frontal lamina. Eyes large, oval, contiguous for 5 rows of facets. 

 Peraeon segments 1-3 and 7 subequal, 4-6 a little longer, anterior 

 margin of 1st segment not bisinuate, posterior margin of each 

 segment with a tranverse row of granules or small tubercles, faint 

 on the first 3 segments ; these segments have in addition a transverse 

 carina across the middle, which is smooth in segment 1, but 

 granulate in segments 2 and 3. Epimera of segments 2-4 as long 

 as segments, posteriorly truncate, postero-inferior angles rounded, 

 that of segment 5 similar but a little longer than segment, those of 

 segments 6 and 7 one-third as long again as segments, postero- 

 inferior angles subacute, that of 7th segment reaching to middle of 

 2nd pleon segment, all epimera with an oblique carina, above which 

 surface is concave, those of 4th-7th segments with a second weaker 

 carina anterior to the other. 



Pleon with 1st segment short, the rest subequal, none of the 

 postero-lateral angles produced, posterior margins with a transverse 

 row of small tubercles ; telson subtriangular, sides rounded ; in 

 one specimen the apex has a blunt median point, flanked on either 

 side by a spine arising from a small indentation, posterior margin 

 finely crenulate and fringed with plumose setae; in the other 

 specimen (from East London) the apex is subtruncate, with the 

 margin as in the first specimen ; surface granulate, without median 

 keel or excavations at base. 



First antenna reaching to middle of 1st peraeon segment and end 

 of peduncle of 2nd antenna, 1st and 2nd joints not expanded, 2nd a 

 little shorter than 1st, 3rd longer than 1st and 2nd together, 

 nagellmn equal to peduncle, 9-11-jointed. 



