136 Mr. R. Gurney on the Copepod 
joint carries two large spines reaching forward nearly to the 
mouth. 
The mouth-parts are overhung by a large anterior lip with 
a toothed edge. Ihave not been able to detect the presence 
of a bilobed posterior lip as shown by Prof. Sars in C. levis, 
but there is a delicate flap or epistome bounding the mouth 
anteriorly and fringed with short cilia. 
The first four pairs of legs are of approximately the same 
structure in both sexes, consisting of an external branch of 
three joints and an inner two-jointed branch as long as the 
first two joints of the outer branch. The first pair (PI. VI. 
fig. 4) is the shortest, and the succeeding pairs increase 
somewhat in length, the fourth being considerably longer 
than the first pair. The external branches of all legs are 
alike, except that the third and fourth pair bear an additional 
seta on the apical joint. The internal branch of the first 
pair is alike in both sexes. The first joint bears a long seta 
with a blunt point fringed with cilia, which, in its normal 
position, is directed forward, reaching nearly to the mouth. 
‘The distal joint bears a spine andalong seta. In the female 
the internal branches of the remaining swimming-legs are 
alike, but differ from the first pair in having the long sensory 
seta upon the base of the second joint and in having two 
apical sete (Pl. VI. figs. 5, 6). In the male the apical 
setee are as in the female, but, in place of the long basal 
seta of the second joint, the second and third legs have a 
peculiar sharply-pointed spine with a small barb (Pl. VI. 
fig. 9). The basal seta of the fourth leg is similar to that 
of the female, but longer and very much stouter (PI. VI. 
fig. 10). 
The fifth pair of legs in both sexes are minute knobs 
bearing two short spines in the female and four in the male 
(Pl. VI. figs. 7, 8). 
I have not seen any female bearing egg-sacs, but on one 
occasion a female which had been kept alive for a few days 
was found to be carrying a single egg attached to the genital 
segment by a slender stalk. The egg was soon burst and 
flattened by the movements of the animal under the cover- 
glass. 
Length. Female °56 to ‘65 mm.; male 6 mm. 
I owe the discovery of this species to Mr. D. J. Scour- 
field, who suggested to me that the submerged parts of dead 
Scirpus and Typha might harbour peculiar Entomostraca. 
The first specimen met with was found on July 14, 1919,*in 
a small piece of dead Typha floating in Hickling Broad, and 
by squeezing such decayed stems, I have found that it is not 
