﻿92 Annals of the South African j\Iusci(m. 



three species there is no other tooth, except the antennal. The 

 third segment of the pleon is medio-dorsally produced over the 

 fourth, but not acutely. The sixth segment is much longer than 

 any of the preceding segments. The apical margin of the telson 

 carries a pair of long spines, between which are 3 rather more 

 than half as long and several setae ; above them are a small pair 

 of spines and outside them a rather short pair, above which on the 

 left are a series of 6 spaced sub-lateral spines, while on the right, no 

 doubt abnormally, there are only 3 spines, unsymmetrical in posi- 

 tion. Stimpson gives the telson of his species 4 pairs of dorsal 

 spines, and the same number is assigned to S. cranchii by Milne 

 Edwards and Bell. Eyes dark, cornea globular. First antennae 

 agreeing with Bate's account of those appendages in '' Hetairus 

 gaimardii (Milne-Edwards)." Second antennae nearly as long as 

 the body, the tooth of the scale almost level with the rounded apical 

 margin. 



Mandibles with much denticulate molar, which is nmch stouter 

 than the incisor process, the latter ending in an obliquely truncate 

 apex, the anterior point of which is finely bifid, and the receding 

 border cut into 6 or 7 little teeth ; the two-jointed palp is rather 

 feeble, the second joint carrying a few setae. The first maxilla has 

 several strong spines about the curved apex of the lower plate, a 

 close fringe of spines round much of the margin of the large median 

 plate, and the palp proximally stout, with two unequal spines on the 

 faintly emarginate much narrower apex. The second maxilla has 

 the lower plate apparently undivided, carrying a curved series of 

 some 10 long not very closely-set setae, the middle plate divided 

 about to the middle, both lobes fringed with close-set setae or spines,, 

 the palp or apical plate not very broad, but the apical part rather 

 abruptly narrowed, tipped with 2 very unequal spines, neither very 

 large. The first maxilliped differs from that described and figured 

 by Bate for Hctairns (jaimardii (Milne Edwards), chiefly in the 

 apical part of the endopod, which Bate speaks of as " a two-jointed 

 continuation," the figure showing the two joints about equal in 

 length. In our species the widest part at the base is short, fol- 

 lowed by a narrower but much longer portion, to which succeeds a 

 still narrower but quite short apical piece. I cannot definitely 

 make out any articulation between these three divisions, though 

 I cannot positively deny its existence between the last two com- 

 partments ; the broad proximal part of the exopod has a distal fringe 

 of long setae, not short ones as in Bate's figure. The second maxilli- 

 peds are in near agreement with the figure given by Bate. The 



