142 Part ITI.—Twenty-third Annual Report 
The female of this species was described and figured by Dr. Wolfenden 
in the Journal of the Marine Biological Association for January, 1902, 
but the male appeared to be unknown. 
The male specimen (fig. 1), which I now propose to describe, agrees so 
closely with Dr. Wolfenden’s definition and figures of the female that, 
after making allowance for sexual differences, I have no hesitation in 
ascribing it to the same species. 
The cephalothorax is robust, and appears to be composed of only four 
segments, but the fifth is so small as to be almost entirely obscured by 
the fourth ; the abdomen is slender and much shorter than the body ; 
rostrum not much produced. The length of the specimen figured is 
about ‘8mm. (about =) of an inch). 
Antennules (fig. 1) moderately slender, except towards the proximal 
end ; they are shorter than the cephalothoracic segment, and composed of 
seventeen joints ; the basal joint is large and stout and rather more than 
half as long as the entire length of the remaining joints, which are all 
short—the tenth, fourteenth, fifteenth and last are, however, rather 
longer than any of the other twelve. The formula shows approximately 
the proportional lengths of all the joints :— 
Proportional lengths of the joints, 58:5°6'4°3:4°4°7:'7:9'6'6°7:9:+12°8:°10 
Numbers of thejoints,- - -1 23 45 6 7 8 9 1011121314 15 16 17 
Posterior antenna, outer ramus scarcely so long as the inner one, and 
composed of five joints—the third and fourth joints are very small and 
sparingly setiferous (fig. 3).* Mouth appendages similar to those of the 
other described species. 
All the four pairs of swimming feet (figs. 4-7) are also similar to those 
of the other described species, except that they are rather more hispid, but 
especially the inner branches of the fourth pair, and the outer branches 
also to some extent. In this pair the joints are more or less covered 
with minute prickles, as shown in the drawing (fig. 7), and the same 
character distinguishes the fourth pair in the female described and 
figured by Dr. Wolfenden. 
Fifth pair are elongated and unequal on the two sides; the left leg 
is long and slender, for though the first and second joints are short, 
the other is of considerable length, and is probably longer than the 
drawing shows it, as the extremity is apparently slightly damaged ; a 
dense fringe of small delicate hairs extends along part of the proximal 
half of the inner margin of the slender end joint, and terminates distally 
at a small hook-like process (fig. 8). The right leg is considerably dilated 
at the proximal end of the second joint, but becomes attenuated towards 
the distal extremity ; the third joint is narrow, and terminates interiorly 
in one or two finger-like processes ; while the end joint, which is very 
slender, and tapers gradually to a pointed apex, is furnished with a small 
process exteriorly near the proximal end, as shown in the drawing (fig. 8.). 
The abdomen is composed of five moderately short segments, and the 
furcal joints are also short (fig. 9). 
Habitat.—Firth of Forth, west of Queensferry. Dredged Nov. 17; 
1893, but only now described and figured. 
Remarks.—One of the characters peculiar to the genus Pseudocyclopia 
is the presence of a long, moderately stout spine which springs from the — 
inner distal angle of the first basal joint of the third pair of legs and 
reaches to about the end of the inner branch, as shown in figure 6. 
* Dr. Wolfenden describes the posterior antenne as one-branched, but the outer ramus 
so characteristic of the Pseudocyclopiide as of the other Calanoida had probably become 
accidentally detached, and had thus given to the posterior antenne an gia: some- 
what unique among Calanoids, 
P 
