62 PROF. G. O. SARS ON THE COPEPODA [Jan, 12, 
the more general characters. Yet it is quite certainly specifically 
distinct from that species, exhibiting as it does a number of 
well-marked differences, of which may be named the spimiform 
character of the caudal sete, the coarse spines with which the last: 
pair of legs are armed, and the unusually small number of joints 
in the anterior antenne. No other true Cyclops has such a small 
number of joints in these antenne, and it is only in the genus 
Halicyclops that a similar composition of the anterior antenne is 
met with. The specific name here proposed refers to this last 
character. 
Occurrence.—Some few specimens of this remarkable form were 
found in a sample from Tanganyika, taken 28/9/04 at Mbete, 
south end of the lake. 'Two specimens (male and female) occur red 
in another sample, taken 12/12/04 at Karema, eastern shore of 
the lake. 
33. CYCLOPS COMPACTUS, sp. n. (Plate X XI. figs. 203, 204.) 
Specific Characters.—FEMALE. Body (fig. 203) of a very compact 
structure, with the anterior division broadly oval in form and 
pronouncedly depressed. Cephalic segment gradnally contracted 
anteriorly, with the frontal part narrowly rounded. Lateral parts 
of the three succeeding segments somewhat expanded. Last 
pedigerous segment short, “but rather broad. Urosome con- 
siderably exceeding half the length of the anterior division and 
only very slightly “tapering behind; last segment comparatively 
short, and clothed laterally with fine spinules. Caudal rami 
somewhat produced, equalling in length the last two segments 
combined ; inner edge straight and perfectly smooth, outer edge 
armed somewhat behind the middle with two or three small 
denticles, seta of this edge very small and attached near the end 
somewhat dorsally; tip obliquely truncated, with the innermost 
seta much smaller than the outermost ; middle setze well-developed 
and clothed for some part of their length with small spinules, 
the inner one much elongated, considerably exceeding half the 
length of the body and fully tivice as long as the outer. Anterior 
antenne comparatively short and not much dilated at the base, 
being composed of 10 articulations. Last pair of legs (see 
fig. 304) each composed of a short joint extending laterally and 
carrying three unusually large recurved sete, the longest of which 
seme. as far as the second ‘eninge segment, all the sete clothed 
with scattered spinules. 
Length of adult female 0°75 mm. 
Remarks.—This form 1s closely allied to the European species, 
C. phaleratus Koch, but is easily distinguished by the much more 
produced caudal rami and by the great development of the setz 
attached to the last pair of legs. 
Oceurrence.—A single female specimen of this form oceurred 
in the same mounted slide which contained the two specimens of 
the above-described species, C. ewacanthus, 
