The Fresh-water Entomostraca of Cape Province. 315 



posterior part ; inferior edges of valves densely ciliated, eye compara- 

 tively large ; ocellus small, located close to the rostrum. Tail-piece- 

 short and obliquely truncated at the end ; anal denticles only four or 

 five on each side ; apical claws short and stout. 



Colour dark brown, with still darker, almost blackish, shadows. 



Length of shell scarcely exceeding O8 mm. 



Remarks. This form was observed as early as the year 1852 by 

 King in the neighbourhood of Sydney, but was erroneously identified 

 with 8. mucronata (M'uller), from which it differs in its much smaller 

 size, as also in the different shape of the head and the comparatively 

 small size of the processes issuing from the infero-posterior corners of 

 the valves. 



Occurrence. Some specimens of this form were reared from one of 

 the parcels of mud kindly sent to me in 1909 by Dr. Purcell. The 

 mud was taken from an old brick-pond at Bergvliet. The same 

 species also occurred occasionally in some of the Australian samples. 



Distribution. Australia, Sumatra. 



GEN. 4. CERIODAPHNIA, Schoedeler. 



This genus seems to be very rich in species, and is represented 

 in nearly all parts of the world. Nearly thirty species have been 

 described by different authors ; but it is not improbable that some 

 of them must be withdrawn as insufficiently characterised. To the 

 fauna of Cape Colony belong six species, to be described in the follow- 

 ing pages. 



12. CERIODAPHNIA PRODTJCTA, n. sp. 

 (Plate XXXIII, figs. 1, 1 a, b.) 



Specific Characters Female. Carapace, seen laterally, rounded in 

 outline, with a very large and conspicuous conical protuberance behind, 

 issuing nearly in the axis of the body. Head, as usual, sharply 

 marked off from the carapace, and somewhat less procumbent than in 

 the other species ; frontal part rather produced and narrowly rounded, 

 without any rostral angle behind. Reticulation of shell very close, but 

 not very conspicuous ; free edges of valves minutely denticulate, the 

 denticles being also continued on the dorsal margin. Eye large,, 

 almost filling up the frontal part ; ocellus very small. Antenuulae 

 comparatively short. Tail-piece of normal shape, tapering slightly 

 towards the end ; anal denticles eight on each side ; apical claws each 

 with five secondary denticles in their proximal part. 



Colour not vet ascertained. 



