234 ANNALS OF SCOTTISH NATURAL HISTORY 



of two marine Copepods that have been added to the British 

 fauna within the last year or two. 



We first describe the species from Loch Leven. 



CANTHOCAMPTUS SCHMEILII, Mrazek, Plate IV. Figs. 1-13. 



1893. Canthocamptus schmeilii, Mrazek, " Beitrag zur Kenntniss 

 der Harpacticidenfauna des Stisswassers" (" Zoologische 

 Jahrbiicher," Siebenter Band), p. 116, Taf. VII. Figs. 

 107-1 17. 



DESCRIPTION. Female. Length .8 ram. (^ of an inch). The 

 cephalothoracic segments serrated on the posterior margins both 

 dorsally and laterally ; the abdominal segments with the posterior 

 edges serrated only on the dorsal aspect, while laterally they are 

 fringed with setae ; the whole integument of the thorax and abdomen 

 covered with minute hairs. The antennules (anterior antennae) 

 somewhat shorter than the first cephalothoracic segment, and eight- 

 jointed : the fifth and seventh joints are shorter than any of the 

 others, the seventh only about half the length of the end joint. 

 The proportional lengths of all the joints are shown by the annexed 

 formula : 



Proportional lengths of the Joints 13 13 14 12 8 n 6 12 

 Number of the Joints I 2 3 45678' 



The secondary branches of the antennae (posterior antennae) are 

 two-jointed : the first joint bears one seta, but the end joint is 

 furnished with two terminal setae one slender, and one stout and 

 spiniform (Fig. 4). The mandible-palp consists of a single very 

 small joint and bears two terminal hairs. The inner branches of 

 the first pair of swimming feet are considerably longer than the 

 outer branches, they are two-jointed, the first joint reaches to about 

 the end of the outer branches, the second is equal to about three- 

 fourths of the length of the first joint, and is also more slender and 

 provided with two apical setae one very long, the other about half 

 the length ; the marginal spines of the outer branches are moderately 

 stout and elongate ; a moderately stout spine springs from the 

 interior distal angle of the second basal joint, and extends to about 

 the middle of the first joint of the inner branches (Fig. 5). The 

 inner branches of the second, third, and fourth pairs are also two- 

 jointed and much shorter than the outer branches, and the first 

 joint of all the inner branches of these three pairs is considerably 

 shorter than the second joint ; in the fourth pair the inner branches 

 are furnished with only one seta, which is terminal and spiniform 

 (Fig. 6). The secondary joint and the inner produced part of the 

 basal joint of the fifth pair are subquadrangular in outline : the 

 secondary joint does not extend much beyond the end of the basal 



