Land, Fresh- Water, and Marine Crustacea. 347 



may be conveniently arranged according to the number of 

 joints in the antennules. 



(a) Species with Seventeen-Jointed Antennules. 



207. Cyclops strenuus} Fischer. 



1851. Cyclops strenuus, Fischer, Bull. Soc. Imp. des Nat. Moscou, 

 vol. xxiv. p. 419, taf. ix. figs. 12-21. 



Hah. — Duddingston Loch, and most of the other lochs 

 within the district, where it occurs nearly all the year 

 round. Cyclops pulchellus and Cyclops abyssorum are other 

 names by which the species is known. 



208. Cyclops Leuckarti, Claus. 



1857. Cyclops Leuckarti, Claus, Das gen. Cycl., Archiv. f. Naturg., 



Jalirg. xxiii. Bd. 1, p. 35, taf. ii. figs. 

 13, 14. 



1897. ,, ,, T. Scott, Fifteenth F. B. Rept., pt. iii. 



p. 322, pi. ix. figs. 23-25. 



Hah. — Loch Vennachar and Loch Voi], Perthshire ; 

 frequent. (See also note on this species in Appendix, p. 380.) 



209. Cyclops bicuspidatus, Claus. 



1857. Cyclops bicuspidatus, Claus, op. cit., p. 209, taf. xi. figs. 



6 and 7. 

 1892. ,, ,, Schmeil, Deutschl. freileb. Siissw.-Copep. 



(Cyclopidae), p. 75, taf. ii. figs. 1-3. 



Hah. — Loch Achray (Trossachs), Loch Leven, Duddingston 

 Loch, ponds on the Braid Hills, Edinburgh (April 1888), as 

 well as in other lochs and ponds throughout the district, 

 but usually not very common. 



210. Cyclops vernalis, Fischer. 



1853. Cyclops vernalis, Fischer, Bull. Soc. Imp. des Nat. Moscou, 

 vol. xxvi. p. 90, taf. iii. figs. 1-5. 



1891. ,, elongatus, G. S. Brady, Revis. Brit. Cyclopidse and 



Calanidse, p. 5, pi. i. figs. 1-5. 



1892. ,, vernalis, Schmeil, I. c, p. 88, taf. ii. figs. 4-7. 



Hub. — The distribution of this species is somewhat similar 



1 Cyclops Ewarti, Brady, was described in the Sixth Annual Report of the 

 Fishery Board for Scotland, p. 232, pi. viii. figs. 1-6, from specimens obtained 

 above Queensferry. I am now inclined to consider this as representing a 

 scarcely mature stage of C. strenuus, Fischer 



VOL. XVI. 2 H 



