FRESHWATER ENTOMOSTRAUA PROM SOUTH AFRICA. 469 



Three specimens found in a gathering from near Victoria 

 Falls are indistinguishable from a Patagonian species des- 

 cribed by Dr. Ekman, the only apparent difference consisting 

 in the want of marginal cilia in the case of the African 

 specimens. Length of the African specimens 0'85 mm., of the 

 Patagonian specimens 0'75 mm. 



• 



Genus Eulimnadia Packard. 

 Eulimnadia victoria s'p. nov. PI. XXXVII, iigs. 1-7. 



Females. — The shell seen laterally is almost circular, 

 diameter 4*5 mm. (fig. 1), very thin and membranous, 

 colourless and translucent, marked with three or four con- 

 centric lines of gi'owth, and, seen with a high microscopic 

 power, very minutely and closely i-eticulated (fig. 7); seen 

 dorsally the outline is ovate, widest in the middle (fig. 2), 

 twice as long as broad, extremities broadly rounded. The 

 front of the head is broadly rounded and is sharply denti- 

 culated, the antennules (fig. 3) long and filiform, jointed in 

 the middle, slightly dilated at the extremities which bear a 

 few fine, sensory (?) hairs; antennae (fig. 4) strongly developed, 

 biramose, basal portion very stout, indistinctly jointed and 

 bearing several setiferous processes; branches seven-jointed, 

 each joint bearing a strong spine and one or more long setas ; 

 the last joint has also four apical setse. Mandibles (fig. 5) 

 stout, deeply pigmented, the apices rounded and beset with 

 numerous minute setae ; caudal laminge (fig. 6) bearing a series 

 of about eight curved denticulated spines of gradually 

 increasing lengths, the two distal pairs extremely long and 

 slender; in front of these spines arises a pair of very long 

 setge, and in front of these again a series of about six short 

 digitiform processes, each of which is profusely fringed with 

 long seta3. 



The genus, as defined by Packard, differs from Limnadia 

 chiefly in the shape of the shell (which is in Eulimnadia 

 narrower in lateral view), in the smaller number of lines 



