236 ANNALS OF SCOTTISH NATURAL HISTORY 
otherwise his description and figures agree very well with the Loch 
Leven specimens. There can be no doubt that our drawings of the 
second, third, and fourth swimming feet in the male are correct, and 
represent them in their proper sequence.’ The difference in the 
number of hairs in the fifth pair of the male may be due to local 
variation. : 
Loch Leven, so far as we know, is as yet the only British 
locality where Canthocamptus schmetlii has been obtained; and 
though collected in 1890, the gathering in which the specimens 
occur was somehow overlooked until the present year. 
CANTHOCAMPTUS MINUTUS, Claus, Plate IV. Figs. 14-20. 
1863. Canthocamptus minutus, Claus, “Freileb. Copep.,” p. 122, 
Pat XN, Pies. 1-3, \ Vat. XIIL. igs x. ; 
1893. Canthocamptus minutus, Schmeil, ‘ Deutschlands  freileb. 
Sussw. Cope: ip 3x, Vat. Il) Pies, 114 
Description. —F/emale.—Length .6 mm. (,, of an inch). Body 
slender, rostrum small. Antennules moderately stout, shorter (than 
the first cephalothoracic segment, eight-jointed ; the fifth joint being 
shorter than any of the others. The proportional lengths of the 
various joints are as follow :— 
Proportional lengths of the Joints 10 10 9 8 5 9 8 to 
Number of the Joints I. 2  3- 4iPs - Gyo 
The secondary branches of the antennze are small and two-jointed, 
the end joint is shorter than the other, the first joint bears one and 
the end joint three sete (Fig. 16), the mandible-palp is very small 
and one-jointed. The inner branches of the first, second, and third 
pairs of swimming feet are three-jointed. The inner branches of the ! 
first pair are rather longer than the outer branches, the first and 
third joints are nearly equal in length and rather longer than the 
middle joint, the three joints are each furnished with a small seta 
near the distal end of the inner margin, and the end joint is also 
armed with two sete—one long and slender and one short and 
spiniform ; a moderately long plumose hair springs from the middle 
of the inner margin of the second joint of the outer branches, and 
the exterior marginal spines of the outer branches are stout and 
elongate (Fig. 17). In the second and third pairs the inner 
branches are considerably shorter than the outer branches. In 
the fourth pair the inner branches are two-jointed, and only extend 
to a little beyond the end of the first joint of the outer branches 
(Fig. 18). The fifth pair has the inner produced portion of the 
basal joint broadly but irregularly rounded and provided with six 
sete: the setz are divided into two groups of three sete each, and 
with a comparatively wide space between each group; those of the 
