The Fresh-water Entomostraca of Cape Province. 31-3 



in a short, obtuse protuberance located about iu the axis of the body ; 

 dorsal margin strongly curved iu its posterior part ; hind edges of 

 valves nearly straight and rather oblique, joining the inferior ones at a 

 well-marked angle. Posterior part of dorsal margin strongly denticu- 

 lated, the denticles being also continued on the terminal protuberance 

 of the shell. Head somewhat more prominent than in the preceding- 

 species, with the front narrowly rounded below ; rostral projection 

 very small, and not defined in front by any notch. Ocellus forming a 

 narrow stripe obliquely ascending from the base of the rostrum. Tail- 

 piece resembling in shape that in the preceding species, though having 

 the supra-anal angle somewhat more prominent ; anal denticles 8-10 

 on each side ; apical claws without any secondary denticles at the 

 base. 



Colour light yellow. 



Length of shell reaching 2'2 mm. 



.Remarks. The above-characterised form agrees fairly well with the 

 species described in 1897 by the present author from specimens 

 collected during the Russian Jana Expedition. As indicated by the 

 specific name, it is nearly allied to the European species, S. vetula 

 (Miiller), differing, however, conspicuously in the shape of the 

 carapace, the hind part of which exhibits a well-marked median 

 protuberance, wholly wanting in 8. vetuln. 



Occurrence. Several specimens of this form were reared from one 

 of the parcels of mud kindly sent to me by Dr. Purcell and taken from 

 old gravel-pits at Bergvliet. The same form was also found in some of 

 the alcoholic samples forwarded to me from the South African 

 Museum and procured by Dr. Purcell iu 1896 from ponds in the 

 Cape Flats. 



Distribution. Siberia, Central Asia. 



10. SlMOSA CAPENSIS (Gr. O. Sars). 



(Plate XXXII, figs. 2, 2 a, b). 



Simocephalus capensis, Gr. O. Sars. On some South African 

 Entomostraca raised from dried mud. Chr. Vid. Selsk. Skrifter, 1895, 

 p. 15, pi. 3. 



Specific Characters Female. Carapace, seen laterally, broadly oval 

 or somewhat rhomboid in outline, with a well-marked protuberance 

 behind in the middle, dorsal margin evenly curved and slightly 

 siuuated just above the said protuberance; hind edges of valves 

 oblique and joining the inferior ones at an obtuse angle. Posterior 

 part of dorsal margin denticulate, the denticles being continued 011 



