1909. ] OF THE THIRD TANGANYIKA EXPEDITION. 4] 
sete. Natatory legs (figs. 51-53) with no seta inside the Ist 
joint of the rami. ‘Last pair of legs (fig. 54) with the distal joint 
oval quadrangular in form, proximal seta of outer edge rather 
strong and spiniform, innermost seta but one likewise strongly 
developed; inner expansion of proximal joint somewhat narrowed 
and extending to about the middle of the distal joint. Ovisacs 
narrow oblong, with the ova partly arranged in a single row. 
MAtLe with the anterior antenne (fig. 56) distinctly hinged. 
Inner ramus of 2nd pair of legs (fig. 57) transformed in the usual 
manner. Last pair of legs (fig. 58) very small, with only four 
sete on the distal joint and two sete on the end of the inner 
expansion of proximal joint. 
Length of adult female 0-45 mm. 
Remarks.—This was the first species which came to my sight, 
and I have therefore given to it the above specific name. From 
the typical species, S. longicauda, it is easily distinguished by the 
comparatively shorter urosome and the somewhat differ ent shape 
of the caudal rami. Moreover, there are some differences to be 
found in the structure of the legs. The present species is also 
rather inferior in size. 
Occurrence.—This form was found occasionally in two of the 
samples from Tanganyika, the one taken 28/9/04 at Mbete, south 
end of the lake, the other, 13/10/04, at Sumbu, south-western 
border. 
7. SCHIZOPERA VALIDIOR, sp. n. (Plate XI. figs. 59-63.) 
Specific Characters.—Frmaue. Body (fig. 59) on the whole 
more strongly built than in the preceding species, with the 
integuments of coarser consistency. Rostrum somewhat less 
produced, but of a similar narrow lanceolate form. Caudal rami 
(fig. 63) rather large and broad, pronouncedly lamellar, and of 
oval form, less dive ergent than in SS. inopinata; inner edge 
distinctly curved and densely hairy, spine of outer edge somewhat 
shorter than in that species, and attached much nearer to the 
end than to the base of the ramus; dorsal seta, on the other hand, 
issuing rather in front of the middle; end of the ramus without 
any denticles above. Anterior antenne (fig. 61) of a similar 
structure to that in S. inopinata, though perhaps a little shorter. 
Posterior antenne less robust. First pair of legs (fig. 61) with the 
outer ramus about as in the last-mentioned species, Inner ramus 
distinctly 3-articulate; Ist jomt not fully as long as the outer 
ramus, the last two joints comparatively more elongated than in 
S. inopinata, and combined considerably exceeding half the length 
of the lst; last joint, as in that species, armed on the tip with a 
slender claw-like spine and two unequal sete. Natatory legs 
with a well-developed seta inside the Ist joint of the inner ramus 
in the two posterior pairs. Last pair of legs (fig. 62) with the 
distal joint of a more regular oval form than in S. inopinata 
and somewhat conically produced at the tip; proximal seta of 
outer edge very long and abruptly deflexed ; innermost seta but 
