Contributions to the Crustacean Fauna of South Africa. 355a 



peraeon segment much weaker, almost obsolete in some cases ; 

 those on posterior margin of 7th peraeon segments and 2nd, 

 3rd, 4th, and 5th pleon segments also weaker ; the tubercles at 

 base of telson and along the margins absent ; the median carina 

 simple, without the basal tooth, and not followed by any tubercles; 

 the telson is longer than broad, apex more obtuse, no spines or 

 setae along the margins and only 10 spines on the apex ; outer 

 distal angle of inner uropod rounded, the distal margin consequently 

 more convex. 



The more marked of the above differences can be recognized 

 in the young of the two forms. Specimens of venusticauda 

 taken from the brood pouch already show 20 spines round the 

 end of the telson, whereas those of the variety show only 7 

 or 8. 



The distribution seems to point to this being a local variety of 

 the more ornate typical form. The former has not yet been found 

 on the west coast of the Cape Peninsula. Stebbing recorded the 

 typical form from Somerset West in False Bay, as well as from 

 Table Bay. These " Somerset West " specimens I have not myself 

 seen ; but it is not likely that the above-mentioned differences 

 were overlooked, nor is one justified in supposing that the 

 " Somerset West " specimens had been wrongly labelled. How- 

 ever, all efforts to discover (at least by shore-collecting between 

 tide-marks) the typical form in False Bay, or the variety in 

 Table Bay, have so far failed. The two forms seem distinctly 

 confined to their respective sides of the Cape Peninsula. 



Length : $ 11 mm., 10 mm. ; breadth : $ 4 mm., $ 3'5 mm. 



Colour : Grey, mottled. 



Locality : St. James and Kalk Bay, False Bay (Dr. W. F. 

 Purcell) ; Plettenberg Bay, 3/7/02, s.s. " Pieter Faure " ; St. James, 

 15/2/14 (K.H.B.), $ $ , $ 5 , and juv. (S.A.M. Nos. 8830, 150055, 

 A50, and A2685 respectively.) 



PONTOGELOIDES, n. g. 



Fifth pleon segment with free margins ; bases of first and second 

 antennae completely separated, flagella subequal, not long ; epistome 

 projecting ; mandibular palp with only two joints, the second very 

 long ; second maxilla normal, the middle plate not narrower than 

 the outer ; maxillipeds 7-jointed, inner plate with 2 coupling-hooks ; 

 peraeopods stout ; first pleopod not indurated, inner ramus nearly 

 as broad as outer ; male stylet on second pleopod not reaching end 



