South African Crustacea. 



In these characters there is nothing tangible, I think, by which 

 8. elisabethdB could be separated from S. sculptus. It may be 

 observed in passing that, if the figures of S. latus by Savigny and 

 Guerin-Meneville can be trusted, the curvature of the tooth on the 

 ante-penultimate joint of the second antennae is of little or no 

 importance. It is, however, to this joint that attention should be 

 directed. In the South African specimens the outer border is cut 

 into five well-marked teeth, well though not quite regularly spaced 

 and graduated, the front one very large and the hindmost very small, 

 but the longest interval being between the second and third, and the 

 last two teeth rather abruptly smaller than the first three. In 

 Whitelegge's figure of S. sculptus the first three teeth of this border 

 are crowded together, and near to the front one there is a large one 

 on the distal border, which is entirely unrepresented in S'. elisabethcB. 

 Latreille's figure of S. sculptus (Encycl. Meth., Atlas, pi. 320, fig. 2, 

 1818) also shows the crowding together of the spines on the outer 

 margin, with very irregular sculpture of the distal border. 



In the present species the antero-lateral angles of the carapace 

 are more sharply produced forward than in any hitherto figured 

 member of the genus. Behind the front tooth the lateral margin is 

 cut into six teeth, successively smaller, passing in a gentle curve to 

 the constriction at the cervical sulcus, at which there is a tooth 

 standing out very distinct from those before and behind it, but not 

 so large as the front lateral tooth. In S. sculptus, according to 

 Whitelegge, the tooth at this point is equal to or larger than that at 

 the antero-lateral angle. Also in S. sculptus numerous more or less 

 acute spines and spiniform tubercles are described by Whitelegge as 

 occupying the dorsal surface of the carapace. In the present species 

 there are four or five bluntish teeth on each half of the frontal 

 margin, two that are definitely spiniform on each side of the orbit, 

 with a very little one to the rear of the inner orbital pair. Along the 

 centre line are two on the gastric region followed by a widely 

 separated transverse pair and then by a transverse pair near 

 together just behind the faintly marked median groove. 



The first pleon segment is described by Whitelegge as having the 

 coxal plate in S. sculptus bilobed ; in the present species it forms a 

 single lobe. Similarly the second segment is here not bilobed. It 

 has the upper margin more or less strongly denticulate, curving 

 back to a strong tooth within which six or seven graduated teeth 

 form the curved lower or hind margin. The four following segments 

 have the upper or front margin faintly crenulate, curving back to a 

 strong tooth, within which the hind border is cut into some seven 



