48 PROF, G. 0. SARS ON THE COPEPODA - [Jan. 12, 
genital segment very distinctly divided in the middle ; last segment 
fully as long as the preceding one and slightly widening at the 
end; anal opercle small, but somewhat prominent, and perfectly 
smooth. Caudal rami about twice as long as they are broad, sub- 
linear in form and slightly diverging, each carrying on the tip a 
strong spiniform seta tipped with a slender bristle and accom- 
panied on each side by a very small hair-hke bristle; seta of outer 
edge likewise small, hair-hke, and attached about in the middle ; 
dorsal seta issuing somewhat nearer to the end. Anterior 
antenne (fig. 95) rather strong and curved, with the Ist joint 
very thick, though scarcely longer than the 2nd; 38rd joint 
carrying at the end anteriorly the usual sensory filament, which 
is rather small; the last two joints, forming together the terminal 
part, very unequal, the Ist quite short, the 2nd somewhat lamellar 
and armed with two strong spines and several thin flexible sete. 
Posterior antenne (fig. 96) with five strong claw-like spines on the 
distal joint, increasing in length distally ; outer ramus very small 
and only provided with three sete at the tip. Mandibular palp 
(fig. 97) likewise smaller than in the typical species. Maxille 
(fig. 98) and anterior maxillipeds (fig. 99) of about the same 
appearance as in that species. Posterior maxillipeds (fig, 100), 
however, comparatively less powerful, Ist pair of legs (fig, 101) 
with the inner corner of 2nd basal joint conically produced and 
tipped with a strong spine; terminal joint of outer ramus armed 
with three slender spines and a single seta issuing from the inner 
corner; inner ramus scarcely longer than the Ist joint of the 
outer. The two succeeding pairs of legs (fig. 102) only differing 
from the 1st in the want of a spine at the inner corner of the 
2nd basal joint, and in the terminal joint of outer ramus being 
somewhat broader and provided with one or two additional sete. 
4th pair of legs (fig. 103) with one of these sete shortened and 
spiniform ; inner ramus quite rudimentary, consisting of a single 
small, nodiform joint tipped with a slender seta. Last pair of 
legs (fig. 104) rather small, with the distal and proximal jomts 
wholly confluent, forming together a short and broad lamella 
produced outside to a conical process, to which a slender hair-lke 
bristle is attached; posterior edge of the lamella irregularly 
indented and fringed with seven thickish, finely ciliated sete. 
Length of adult female 0°49 mm. 
Remarks.—Vhe above-described form unquestionably is referable 
to the genus Jlyophilus, as defined by Prof. Lilljeborg, but is 
quite certainly specifically distinct from the typical species 
I. flewibilis, differing, as it does, in some pomts very markedly. 
Thus the caudal rami are much more produced, and the last pair 
of legs are distinguished by the complete coalescence of the 
two joints of which these legs are originally composed. It is also 
rather inferior in size. 
Occurrence —Only a single female specimen of this remarkable 
form has come to my notice. It was picked up from some muddy 
deposit contained ina sample from Tanganyika, taken 13/10/04 
