14 G- O. Sais. 



can therefore be only faintly traced. Finally, the surface of 

 the carapace is not smooth, as in the former species, but 

 conspicuously scabrous from the presence of numerous 

 small prickles, especially densely crowded together in the 

 posterior part. 



The eyes and the post-ocular tubercle do not exhibit 

 any essential difference from those parts in the preceding; 

 species. 



The exposed part of the body is very slender, exceeding 

 the median length of the carapace by almost its 3rd part^ 

 or, to speak more precisely, by its 8 posterior segments. 

 It comprises about 30 segments, of which the 16 anterior 

 ones are pedigerous, whereas the remaining 14, as in the 

 female of Ä. namaquensïs, are without ventral appendages 

 (see fig. 10), and accordingly belong to the caudal part. 

 The armature of the segments is much as in the above- 

 named species. The caudal filaments, however, are com- 

 paratively longer, considerably exceeding half the length of 

 the body. 



In the structure of the legs (see figs. 11 — 13) there is- 

 but little difference between the two species. 



Occurrence. — As above mentioned, only a solitary,, 

 but well preserved female specimen of this form has hitherto 

 come under my notice. It was taken by Mr. W. Sculley 

 together with the preceding species in the Namaqualand. 



