62 G- 0. Sårs. 



large, with the lower edge evenly curved. Caudal part 

 rather large and expanded, dorsal edge below the anal ori- 

 fice but slightly curved, supra-anal projection not very pro- 

 minent, lower corner rounded off and not produced at all, 

 denticles of marginal and lateral rows distinct, though rather 

 small, caudal claws with an unusually long and slender den- 

 ticle at the base. Colour whitish, pellucid. Length of adult 

 female 0.45 mm. 



Remarks. — In the general form of the carapace and 

 the strongly denticulated infero-posteal corners of the valves, 

 as also partly in the shape of the caudal part, this form 

 somewhat recalls the species of the genus Pleuroxus. It is 

 however, easily proved to belong not to this, but to the 

 present genus, by the absolute immobility of the head and 

 the shortness of the rostral projection, as also by the large 

 size of the lip-plate. Its nearest ally seems to be A. dia- 

 pliana (King), from which, however, it is distinguished by 

 a number of well-marked characters. 



Occurrence. — Several specimens of this fine species 

 were taken up by the aid of the dipping-tube from the 

 bottom of some of my aquaria prepared with mud from the 

 neighbourhood of Sâo Paulo. Male specimens were not found. 



30. Alonella clathratula, G. O. Sars. 



(PI. X, figs. 5, 5 a). 



Alonella clathratula, G. O. Sars, On Fresh-water Entomostraca from 

 the neighbourhood of Sydney. Arch. f. Mathem. og Naturvid. 

 1896, p. 43, PI. 6, figs. 7, 8. 



Remarks. — This form was described and figured 

 by the present author in the above mentioned paper from 

 some few specimens found in a sample taken near Sydney 



