71 



pages 5 Norwegian species belonging to this genus will be described. To these 

 may be added a considerable number of exotic species. I have for instance recorded 

 no less than 7 species from the Central African lake, Tanganyika, and another 

 well-defined African species is known to me from Cape Colony. Moreover 

 the North-American species, Cyclops I'lcyaiis Herrick and 6'. pectinifer Cragin, 

 unquestionably belong to the same genus, and also 2 other, apparently new 

 species from the same part of the world have been examined by me. 



41. Leptocyclops agilis, (Koch). 



(PI. XLIII). 

 Cyclops ayilifi, Koch, 1. c. Heft 21, Tab. 3. 



Syn : Cyclops fterrnlatus. Fischer. 

 rarius, var. brachytvra, Lilljeborg. 



Specific Characters. Female. Body moderately slender, with the anterior 

 division oval in outline, greatest width somewhat exceeding half the length and 

 occurring in the middle. Tail slender, about equalling in length -j- A of the anterior 

 division; genital segment scarcely longer than the 2 succeeding segments com- 

 bined and considerably dilated at the base. Caudal rami generally not much 

 prolonged, equalling about the length of the last 2 segments combined, and 

 slightly bent outwards at the ends, outer edge finely denticulated throughout; 

 seta of this edge very small and attached near the end somewhat dorsally ; 

 middle apical setse rather slender and, as usual, clothed in their proximal parts 

 with scattered coarse hairs, the inner one about equalling half the length of the 

 body, the outer considerably shorter; seta of inner corner scarcely longer than 

 that of the outer, which is much coarser, spiniform. Anterior antennae long and 

 slender, reaching, when reflexed, to the end of the 2nd segment, the 3 outer 

 joints very narrow and bordered by a hyaline rib, which is quite smooth through- 

 out. Posterior antennae with the terminal joint scarcely longer than the penulti- 

 mate one. Anterior maxillipeds comparatively short and stout, with the sub- 

 division of the 1st basal segment indistinct. Posterior maxillipeds likewise short, 

 with the outer 2 joints imperfectly defined and the setse issuing from them in 

 front stout and curved against each other. Natatory legs exhibiting the structure 

 characteristic of the genus; apical spines of inner ramus in 4th pair of moderate 

 size, the inner one somewhat longer and more slender than the outer. Last 

 pair of legs with the spine of the inner edge very large and coarsely dentate. 

 Ovisacs oval fusiform in shape and slightly divergent, each containing a rather 

 limited number of ova. Seminal receptacle with the anterior part transversely 

 elliptical in form and slightly emarginated anteriorly. 



