Tlie Fresh-water Entomostraca of Cape 1'mrince. 335 



other naturalists. It is especially distinguished by the shape and 

 armature of the caudal piece. 



Occurrence. Two well-preserved female specimens of this form were 

 found in an alcoholic sample taken by Dr. Purcell from a pond in the 

 Cape Flats, and kindly sent to me for examination. 



Distribution. Norway, Sweden, Finland, South America. 



34. ALONA CRASSICAUDA, u. sp. 

 (Plate XL, figs. 1, la.) 



Specific Characters Female. Shell, seen laterally, oval in outline, 

 with the dorsal margin quite evenly arched throughout, ventral straight 

 or slightly concave in the middle, hind extremity obtusely truncated, 

 with no distinct angle either above or below. Head somewhat procum- 

 bent, with the rostral corner moderately produced and curved down- 

 wards. Surface of valves indistinctly striated, exhibiting slight traces 

 of an irregular reticulation. Ocellus somewhat smaller than the eye, 

 and located a little nearer to it than to the tip of the rostrum. 

 Autenuulae nearly extending as far as the latter. Tail-piece compara- 

 tively short, but unusually strongly built, being rather thick at the 

 base and slightly narrowed towards the extremity, which is transversely 

 truncated ; supra-anal angle not much prominent, and occurring nearly 

 in the middle of the piece ; infra-anal denticles rather irregular, the 

 two or three distal ones on each side much coarser than the others ; 

 sub- marginal combs well marked, about eight on each side ; apical 

 claws rather coarse, with the basal denticle of moderate size. 



Body pellucid, with a slight yellowish-brown tinge. 



Length of the specimen examined, O48 mm. 



Remarks. I cannot identify the above-characterised form with any 

 of the known species. The nearest ally seems to be' A. cambouci, 

 Richard ; but the form and armature of the tail-piece is rather 

 different. 



Occurrence. Only a single female specimen of this form has hitherto 

 come under my notice. It was found in one of my aquaria prepared 

 with mud taken by Dr. Purcell from an old brick-pond near Bergvliet. 



35. ALONA PULCHELLA, King. 

 (Plate XL, figs. 2, 2 a.) 



Alona pulchella, King. On Australian Entomostraca. Papers and 

 Proc. Eoy. Soc. Van Diemeu's Land, vol. ii, part ii, 1852, p. 260, pi. 

 viii b. 



23 



