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 schmeilii has been obtained ; and 

 though collected in 1890, the gathering in which the specimens 

 occur was somehow overlooked until the present year. 



CANTHOCAMPTUS MINUTUS, dans, Plate IV. Figs. 14-20. 



1863. Canthocamptus minutus, Glaus, " Freileb. Copep.," p. 122, 

 Taf. XII. Figs. 1-3, Taf. XIII. Fig. i. 



1893. Canthocamptus minutus, Schmeil, " Deutschlands freileb. 

 Sussw. Copep.," p. 31, Taf. II. Figs. 1-14. 



DESCRIPTION. Female. Length .6 mm. (-j^- 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 10 

 Number of the Joints I 2345678' 



The secondary branches of the antennas are small and two-jointed, 

 the end joint is shorter than the other, the first joint bears one and 

 the end joint three setae (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 setae 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. 1 8). The fifth pair has the inner produced portion of the 

 basal joint broadly but irregularly rounded and provided with six 

 setae : the setae are divided into two groups of three setas each, and 

 with a comparatively wide space between each group ; those of the 



