Annals of the South A frican. Museum. 



quite straight, anal denticles about ten on each side, the outermost 

 one smaller than the others; apical claws without any secondary 

 denticles. 



Body highly pellucid, with a faint greenish tinge. 



Length of shell reaching 07 mm. 



Remarks. The present species, established by Dr. Eichard, has 

 a general resemblance to the above-described variety of C. reticulata 

 and may, at first sight, easily be confounded with it. On a closer 

 examination, however, it admits of being clearly distinguished by the 

 absolute absence of secondary denticles on the caudal claws. 



Occurrence.- -This form developed in great abundance in some of 

 my aquaria prepared with mud received from Dr. Purcell in the year 

 1909. The mud was taken from different localities in the neighbour- 

 hood of Bergvliet. 



Distribution.. Sumatra, New Zealand, Australia. 



1C). CERIODAPHNIA LATICAUDATA, P. E. Miiller. 

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



Ceriodaphnia latieaudata, P. E. Miiller. Daumarks Cladocerer 1867 

 p. 130, pi. 1, tig. 19. 



Syn. : Da^hnia reticulata, Baird (not Jurine). 



Oeriodaphnia quadrangula, G. O. Sars (not Miiller). 



Specific Characters Female. Carapace, seen laterally, rounded 

 quadrangular in outline, with the posterior protuberance not very 

 prominent and occasionally considerably above the axis of the body. 

 Head comparatively small and rather procumbent ; frontal part narrowly 

 rounded, with only a slight trace of angle behind. Eeticulatiou of 

 shell very conspicuous, edges of valves smooth. Eye of moderate size. 

 Antennulae somewhat produced, though resembling in structure those 

 in the preceding species. Tail-piece unusually large and expanded, 

 almost securiform in shape, the posterior edge forming in the middle a 

 bold curve ; anal denticles ten on each side and nearly equal-sized ; 

 apical claws perfectly smooth. 



Colour of shell yellowish orange, with the enclosed body of a darker 

 red hue. 



Length of shell reaching 0'75 mm. 



Remarks. I have failed to detect any essential differences between 

 the above-characterised form and typical specimens of C. latieaudata 

 taken in Norway. The species is particularly distinguished by the 

 shape of the tail-piece, which is rather unlike that in the other species 

 here described. 



