Fresh-water Entoniostraca of South America. 59 



projection very slight, lower corner somewhat produced and 

 narrowly rounded, marginal denticles very small and only 

 visible at the lower corner, no lateral denticles present; 

 caudal claws with an extremely small denticle at the base. 

 Colour whitish. Length of adult female 0.31 mm. 



Remarks. — This is an easily recognizable form, 

 which in shape and sculpture somewhat recalls the Euro- 

 pean species A. nana Baird. It is, however, of considerably 

 larger size, and the striæ are much more numerous. More- 

 over, the structure of the caudal part is very different. 



Occurrence. — Only a solitary female specimen of 

 this form has hitherto come under my notice. It came up 

 in the dipping-tube from the bottom of one of my aquaria 

 prepared with mud from Sao Paulo. Though the aquarium 

 was subsequently very carefully examined, no more specimens 

 were found. 



27. Aloiiella Kama (King). 



(PL X, figs. 2, a-d). 



Alonella Kama (King), G. 0. Sars, Additional notes on Australian 

 Cladocera raised from dried mud. Chr. Vid. Selsk. Forh. 188S, 

 p. 50, PI. 5, figs. 8, 9. 



Syn. Alona Mülleri, Eichard. 



Remarks. — This form was described and figured 

 in the year 1888 by the present author from a solitary 

 female specimen raised from dried Australian mud, and it 

 was identified with the very imperfectly known form recorded 

 by King as Alona Karua. I can see no difference between 

 the Brazilian specimens reared in my aquaria, and the Austra- 

 lian form. The Alona Mülleri of Richard is unquestionably 

 the very same species, none of the distinctive characters 

 referred to by that author being reliable as specific marks. 



