518 Transactions of the Society, 



B. Segments Y. and VI. Completely United. 

 E. africanus sp. n., plate XVII. figs. 2a, 2&. 



Specific Characters. — Small. Plates, 10 : arrangement normal — 

 2 pairs, 3 median, vi. trilobate. Lateral processes, a a seta, h a 

 spicule, c, d, and e short spines with expanded bases. Dorsal pro- 

 cesses, 4 acicular points on the interspace behind ii., 2 short spines 

 on the posterior border of each plate of the first pair — one on the 

 angle, and one near the median line — 2 similar spines on the plates 

 of the second pair. Plates regularly dotted. Fringe of sharp teeth 

 on 4th leg. 



Length 150 /a. The paired plates are each sub-divided by 

 ■obscure curved transverse lines into three parts. This division 

 may be of the same kind as that which gives rise to many small 

 plates in Professor Kichter's two species, E. quadrispinosics and 

 E. scrofa (S). 



The first and second median plates are each crossed by a trans- 

 verse line, which appears to separate two distinct parts. The part 

 posterior to the line is certainly punctate, but it is doubtful if the 

 anterior part is punctate, and I am uncertain whether it forms a 

 plate of equal value with the other, as it does in several species 

 {E. islandicus, etc.), or if it is merely a connecting membrane. 



Professor Eichters calls attention to the correspondence of the 

 4 acicular points with the spicules occupying the same position in 

 E. islandicus. 



There is, indeed, a considerable superficial resemblance between 

 this species and E. islandicus {12) and E. borealis (6), especially 

 the latter. Those are the only two species previously described 

 which have processes on the paired plates between the angle and 

 the median line of the body. The lateral processes correspond, 

 except in relative size ; the processes near the middle line agree 

 with those of ^. borealis ; and the transverse division of the median 



