306 Annals of the South African Museum. 



spine) of 4 - 2 mm., whereas the European form may grow to a length 

 of 5'3 mm. 



Occurrence. Numerous specimens of this form were contained in a, 

 sample taken by Dr. Purcell in September, 1896, from a dam at Touws 

 Eiver Station, Worcester Div. The species has recently been success- 

 fully reared in my aquaria from mud taken by Mr. Orjau Olseu from 

 a pond near the Whaling Station at Saldauha Bay. 



Distribution. Throughout Europe, Turkestan, Palestine, Central 

 Asia, Algeria, Tunis, Greenland. 



2. DAPHNIA DOLICHOCEPHALA, GT. 0. Sars. 

 (Plate XXIX, figs. 2, 2 a, 6.) 



Daplmia dolichocephala, G. O. Sars. On some South African Ento- 

 mostraca raised from dried mud. Chr. Vid. Selsk. Skrifter f. 1895, 

 p. 4, pi. 1. 



Specific Characters Female. Carapace, seen laterally, oblong oval 

 in outline, and gradually conti-acted behind, with the spine of variable 

 length and originating nearly in the axis of the body, though slightly 

 upturned ; denticles of dorsal edge extending (at least in ephippial 

 specimens) beyond the cervical region. Head comparatively large, 

 with the occipital part more or less bulging above, front sub-angular 

 below ; inferior edge quite straight ; rostrum short and obtuse, slightly 

 scabrous in front. Eyes well developed and occurring just within the 

 frontal angle. Auteuuulse small, knob-like, and originating from a 

 broad fleshy protuberance immediately behind the rostrum. Tail- 

 piece comparatively short and conical in form, with the hind edge quite 

 straight, and denticles small, ten to twelve on each side, and not 

 extending to the middle of the piece ; apical claws short and thick, with 

 the secondary denticles well marked. Intestinal tube forming a bold 

 curve within the occipital part of the head. 



Body pellucid, with a greenish tinge. 



Length of shell (without the spine) reaching 3 mm. 



Remarks. This form was described by the present author as early 

 as the year 1895 from specimens reared out of mud taken at Kyusua, 

 and its specific distinctness had been admitted by all subsequent 

 authors, though in some respects it exhibits a certain resemblance to 

 D. iitkinsoni, Baird. 



Occurrence. I have reared this form from the Knysna mud and also 

 from mud taken in another locality, viz. at Green Point Common, near 

 Cape Town, and the same species was moreover contained in two alco- 



