1909. ] OF THE THIRD TANGANYIKA EXPEDITION, 4D. 
Remarks.—The peculiar armature of the anal segment and of 
the caudal rami will suffice for distinguishing at once this species 
from any of the preceding, and it 1s from this character that 
the specific name here proposed is derived. In the structure of 
the Ist pair of legs it differs conspicuously from the type. 
Occurrence. —A single female specimen of this form was 
found in the above-mentioned sample taken in Tanganyika at 
Mbete. 
SCHIZOPERA FIMBRIATA, sp. n. (Plate XII. figs. 82-86.) 
Specific Characters.—FrMAue. Body (fig. 82) moderately slender 
and slightly attenuated behind. Rostrum well defined and of 
the usual narrow lanceolate form. Last caudal segment fully as 
long as the preceding one, and, as in S. spinalosa, armed above 
on each side of the anal area with an oblique row of small 
spinules; anal opercle well developed, semilunar, and fringed 
with a regular row of about 16 similar spinules. Caudal rami 
(fig. 86) considerably shorter than the anal segment and of oval 
form; inner edge somewhat curved at the base; spine of outer 
edge short and thick, curved outwards, and attached somewhat 
nearer to the end than to the base; dorsal seta likewise issuing 
behind the middle; upper face of each ramus armed with three 
transverse rows of extremely fine spinules, the Ist crossing the 
base, the 2nd extending from the inner edge to the dorsal’ seta, 
the 3rd occurring just above the insertion of the apical setee. 
Anterior antennee comparatively short, but composed of the 
normal number of joits. First pair of legs (fig. 83) with both 
rami comparatively short, last joint of outer ramus not attaining 
the length of the middle one; inner ramus composed of only two 
joints, the Ist about the length of the outer ramus, the 2nd 
scarcely more than one-third as long and armed on the tip with 
a claw-like spime and a slender seta accompanied by a small 
hair-like bristle. Natatory legs (fig. 84) with unusually short 
rami, but otherwise of normal structure. Last pair of legs 
(fig. 85) likewise shorter than usual; distal joint scarcely longer 
than it is broad, and, as in S. spinulosa, only provided with five 
marginal sete; inner expansion of proximal joint extending 
about as far as the distal joint. 
Length of the specimen examined 0-44 mm. 
Remarks.—The most characteristic feature of this species is 
undoubtedly the structure of the anal opercle, which, as in the 
species of the genus WVitocra, is fringed with a regular row of 
spinules, and it is indeed from this character that the specific 
name here proposed is derived. Moreover, the peculiar shape of 
the outer spine of the caudal rami is rather characteristic and 
affords another easily observable specific mark, 
Occurrence.—A single, apparently not yet fully grown female 
specimen of this form was found in a sample from Lake Nyasa, 
taken 13/6/04 in Anchorage Bay, south end of the lake. 
