1909. ] OF THE THIRD TANGANYIKA EXPEDITION. 43 
Harbour, western shore of the lake. Finally a single female 
specimen was found in the above-mentioned sample from Victoria 
Nyanza, 
9. SCHIZOPERA UNGULATA, sp.n. (Plate XI. figs. 68-71.) 
Specific Characters.—Frmaue. Body (fig. 68) rather slender, 
sublinear in form or very slightly attenuated behind. Rostrum 
long and prominent. Last caudal segment a little shorter than 
the. preceding one, but scarcely narrower ; anal opercle very small 
and perfectly smooth. Caudal rami (fig. 71) rather darge and 
broad, conspicuously lamellar and somewhat divergent; inner 
edge cre! and densely hairy; spine of outer edge ainachied 
nearer to the end than to the base of the ramus; “danse seta. 
originating about in the middle; end narrowly truncated and 
without any denticles above. Anterior antenne rather slender, 
but of usual structure. First pair of legs (fig. 69) with the outer 
ramus comparatively short and stout, having the last joint 
longer than the others; inner ramus Sirol built, but only 
composed of two joints, the Ist considerably longer: than the 
outer ramus and slightly curved, the 2nd quite short and abruptly 
incurved, carrying on the tip a strong claw and a comparatively 
short seta, accompanied by a small hair-like bristle. Natatory 
legs rather strongly built, but scarcely differing in their structure 
from those in the two preceding species. Last pair of legs (fig. 70) 
with all the marginal sete, except that issuing from the tip of 
the distal joint, remarkably strong and spiniform, being also 
much shorter than in the three preceding species ; inner expansion 
of proximal joint extending almost to the tip of the distal 
joint. 
Length of adult female 0°50 mm. 
Remarks.—This species is chiefly distinguished from the pre- 
ceding ones by the rather different structure of the Ist pair of 
legs, the inner ramus of which is composed of only two joints 
and is more prominently prehensile than in those species. It 
also differs somewhat in the shape of the caudal rami and the 
structure of the last pair of legs. 
Occurrence.—Only a single specimen of this form, a female 
with well developed ovaria, but without ovisacs, has come to my 
notice. It was found in the same sample in which S. validior 
occurred. 
10. ScHIZOPERA MINUTICORNIS, sp.n. (Plate XII. figs. 72-77.) 
Specific Characters.—FrmMaun. Body (fig. 72) very slender and 
narrow, sublinear in form, with the posterior division fully as 
long as the anterior. Rostrum (see fig. 73) acutely produced. 
Last caudal segment a little shorter and narrower than the pre- 
ceding one; anal opercle very small and quite smooth. Caudal 
rami (fig. 77) pronouncedly lamellar and of oval form, being only 
slightly divergent; inner edge evenly curved and very finely 
ciliated, spine of outer edge not very strong and attached at a 
