38 PROF. G. 0. SARS ON THE COPEPODA (Jan. 12, 
dilated in its anterior part and but slightly narrowed behind. 
Last seement of metasome (see fig. 35) confluent with the pre- 
ceding one, and having the lateral parts conspicuously expanded, 
each terminating in an acutely produced corner pointing out- 
wards, their posterior edge being boldly rounded off and without 
any mucro (figs. 36 & 37); left expansion a little larger than 
right. Urosome (fig. 35) comparatively short, with the genital 
segment slightly asymmetrical and almost of uniform width 
throughout; last two segments confluent, and combined not 
attaining half the length of the genital segment. Caudal rami 
short, with the marginal sete normal. Anterior antennz (see 
figs. 33 & 34) remarkably short, when reflexed scarcely extending 
beyond the middle of the genital segment. Last pair of legs 
(fig. 38) with the inner ramus rather produced, extending almost 
to the end of the proximal joint of the outer, and tipped with 
two slender sete; claw of the latter ramus comparatively short 
and smooth inside; terminal joint very small and imperfectly 
defined at the base, its inner apical seta not extending as far as 
the claw. 
Mats (fig. 39) with the lateral corners of the last segment of meta- 
some produced backwards, that on right side the more prominent, 
each tipped with a delicate, hair-like mucro. Antepenultimate 
joint of right anterior antenna (fig. 40) produced at the end to a 
strong spiniform process extending to the end of the succeeding 
joint. Last pair of legs (fig. 41) with the squamiform expansions 
of lst basal joimt each tipped with a slender hair-like spine; 
right leg with the 2nd basal joint simple, without any projection 
at the end; proximal joint of outer ramus produced at the outer 
corner to an acute spiniform process; distal joint oval in form. 
and provided on the posterior face, somewhat in front of the 
middle, with a slightly curved spiniform projection ; lateral spine 
comparatively short and attached near the end of the joint ; 
apical claw rather strong, and abruptly curved in the middle. 
Left leg with the outer ramus pronouncedly spoon-shaped and 
uniarticulate ; inner edge evenly curved and fringed with short 
hairs; apical digit very short and obtuse at the tip; anterior 
face of the ramus hollowed and provided with a delicate ciliated 
lappet not projecting beyond the inner edge (fig. 42). 
Length of adult female 1-25 mm. 
Remarks.—Vhis form is at once distinguished from the other 
four species here described by the shortness of the anterior 
antenne. Moreover, several well-marked differences are found in 
the other structural details, as pointed out in the above diagnosis. 
I have much pleasure in naming this distinct species in honour 
of the distinguished conductor of the Expedition. 
Occurrence.—This species is peculiar to Lake Nyasa. I have 
found it very abundantly in three of the samples from that lake, 
one of them being taken 17/6/04 in Monkey Bay, the other two. 
off Karonga, north end of the lake. 
