On Fresh-water Entomostraca. 67 



division, 1st segment moderately tumid and slightly asyme- 

 trical. Caudal lamellæ nearly as long as the last 2 seg- 

 ments combined. Anterior antennæ scarcely exceeding in 

 length the anterior division of the body; right prehensile 

 antenna in male about as in B. triarticulata. Last pair of 

 legs in female, with the terminal joint of the outer ramus 

 shorter than the preceding joint, and armed with 7 spines, 

 the outer apical one being rather strong; those in male, of 

 the structure characteristic of the genus, inner ramus of 

 right leg conically tapered, with a small curved seta inside 

 the base, left leg without any serrated lamella at the base 

 of the inner, extremely small ramus. Length of female 

 3.20 mm. 



Remarks. — In the comparatively robust form of the 

 body, this new species somewhat resembles the South Ame- 

 rican form B. brasiliensis, Lubbock, as recently described 

 by Messr. Poppe and Mråzek. It is, however, of much 

 larger size and, moreover, differs rather markedly in some 

 of the anatomical details. From B. triarticulata it is also 

 very easily distinguishable. 



Description of the female. 



The length of the body, measured from the front to 

 the tip of the caudal lamellæ, is 3.20 mm., and this species 

 accordingly grows to a very considerable size. 



The form of the body, as compared with that of 

 B. triarticulata, is very robust, the anterior division being 

 considerably tumefied, and more than twice as long as the 

 posterior one. Seen from above (fig. 1), the former division 

 exhibits an oblong subfusiform shape, the greatest breadth 

 occurring somewhat in front of the middle, and almost 

 equalling half the length. Anteriorly it terminates in a nar- 



