Fresh-water Entomostraca of South America. 63 



by Mr. Whitelegge. As observed in that paper, it is closely 

 allied to the European species A, excisa Fischer, though 

 differing in some few characters pointed out in that paper. 

 I also found the very same differences in the Brazilian 

 specimens observed in my aquaria, proving this form to be 

 a well-defined species. On the accompanying plate, figures 

 of an adult female and of the posterior part of the carapace 

 together with the tail, more highly magnified, are given, to 

 show the close resemblance between the Brazilian and Austra- 

 lian forms. • 



Occurrence. — Specimens of this form were occa- 

 sionally taken up in the dipping-tube from the bottom of 

 some of my aquaria prepared with mud from Sâo Paulo. 



The species has not been recorded by other authors. 



31. Alonella sculpta, n. sp. 



(PL X, figs. 6, 6 a). 

 Specific Characters. — Female. Carapace, 

 seen laterally, rounded triangular in outline, height about 

 equalling the length, posterior extremity rather narrowed, 

 and rounded at the end, both upper and lower corner obso- 

 lete, dorsal margin boldly arched, ventral considerably bulg- 

 ing in front. Head rather short, and somewhat flattened 

 dorsally, rostral projection very slightly produced and obtuse 

 at the tip. Surface of shell very distinctly sculptured with 

 rather distant striæ, which run longitudinally, on the pos- 

 terior part of the carapace the lowest sending off a number 

 of short transverse lines to the inferior edges of the valves, 

 the superior ones partly anastomosing into an irregular net- 

 work. On the anterior part of each valve, 6 very strongly 

 marked and curved transverse striæ occur, abruptly cutting 



