250 PROCEEDINOS OF THE NATIONAL MUSEUM. vol.42. 



Soc. Natur. Moscou, 1897, No. 1, p. 122, pi. 2, fig. 6.— Lilljeborg, Kongl. 

 Svenska Vet.-Akad. Handl., vol. 35, 1901, p. 28, pi. 2, figs. 20-25.— 

 Grater, Rev. Suisse Zool., vol. 11, 1903, pp. 514-523, pi. 15, figs. 15 and 

 33.— VAN DouwE, Die Susswaeserfauna Deutschlanda, Heft. 2, 1909, pp. 

 24-25, figs. 69-71. 



Cyclops brevicaudatus Claus, Das genus Cyclops, 1857, pp. 34-35, fig. 12; Die 

 frei lebenden Copepoden, 1863, p. 100.— Lubbock, Trans. Linn. Soc. London, 

 vol.24, 1863, pp. 200-201.— Fric, Arch. Naturw. Land. Bonmen, vol. 2, 1872, 

 Abth. 4, p. 221, fig. 15.— HoEK, TijdscTi. Ned. Dierk. Ver., vol. 3, 1876, pp. 

 15-17, pi. 2, figs. 1-9. 



Cyclops furdfer Claus, Arch. f. Naturg., Jahrg. 23, vol. 1, 1857, p. 208-209, pi. 11, 

 figs. 14-16. 



Cyclops smti/er G. O. Sars, Forh. Vid. Selsk. Christiania, 1863, p. 237.— 

 Lilljeborg, Kongl. Svenska Vet.-Akad. Handl., vol. 85, 1901, p. 33, pi. 2, 

 figs. 26-27. 



Cyclops abyssorum G. O. Sars, Forh. Vid. Selsk. Christiania, 1863, p. 238. — 

 Brady, Nat. Hist. Trans. Northumberland, Durham, and Newcastle-upon- 

 Tyne, vol. 11, 1891, p. 73, pi. 3, figs. 1-9. 



Cyclops clausii Lubbock, Trans. Linn. Soc. London, vol. 24, 1863, pp. 201-202, pi. 

 31, figs. 12-14. 



Cyclops vicinus Uljanin, Schrift. Ges. Freunden Naturw. Moskau, vol. 11, 1875, 

 pp. 30-31, pi. 10, figs. 1-7. — Lande, Materyjaly do Fauny Skorupiakow 

 Widlonogich Krolestwa Polskiego. Widlonogi Swobodnie Zyjace, I, Rodzina 

 Cyclopy, 1890, pp. 47-19, pi. 16, figs. 33-41; pi. 21, fig. 164.— Brady, Nat. 

 Hist. Trans. Northumberland, Durham, and Newcastle-upon-Tyne, vol. 11, 

 pt. 1, 1891, p. 12, pi. 1, figs. 6-9. — Lilljeborg, Kongl. Svenska Vet.- 

 Akad. Handl., vol. 35, 1901, p. 26, pi. 2, figs. 16-19. 



Cyclops fedtschenkoi Uljanin, Schrift. Ges. Freunden Naturw. Moskau, vol. 11, 

 1875, pp. 31-32, pi. 12, fig. 10. 



Cyclops pulchellus Brady, Mon. Copepoda Brit. Isles, vol. 1, 1878, pp. 107-108, 

 pi. 17, figs. 1-3. 



Cyclops claudiopolitanus Daday, Math, es term^szettud. Kozl. Vonatk. a haz. 

 viszony, 1885, pp. 227-229, pi. 1, figs. 14-18. 



Cyclops hungaricus Daday, Math, ^s term^szettud. Kozl. Vonatk. a haz. viszony, 



1885, pp. 230-233, pi. 2, figs. 9-12. 



Cyclops bodamicus Vosseler, Jahresh. Ver. Vat. Nat. Wiirttemberg, 22 Jahrg., 



1886, p. 193, pi. 5, figs. 13-18. 



Cyclops luciduliis Vosseler, Jahresh. Ver. Vat. Nat. Wiirttemberg, 22 Jahrg., 



1886, p. 196, pi. 5, figs. 1-12. — ^Thallwitz, Jahresb. ornith. Beobacht. Stat. 



Sachsen, vol. 5, 1890, p. SO. 

 Cyclops quadricornis Sostaric, Rad. Jugoslav, akad., vol. 92, 1888, pp. 62-64, 



pi. 1, fig. 5. 

 Cyclops strenuus, var. vidna Fri6 and Vavra, Arch. Naturw. Land. Bohmen, 



vol. 9, 1893, pp. 57-58, figs. 44a and 446. 

 Cyclops miniatus Lilljeborg, Kong. Svenska Vet.-Akad. Handl., vol. 35, 1901, 



p. 24, pi. 2, figs. 13-15. 

 Cyclops holensis Lilueborg, Kong. Svenska Vet.-Akad. Handl., vol. 35, 1901, 



p. 21, pi. 2, figs. 11-12. 



Inasmuch as Cyclops strenuus has not before been found in America, 

 a somewhat detailed description of the species is given. 



The cephalothorax (fig. 1) is broadly oval, the posterior segments 

 being much wider than in most of the species of Cyclops; the breadth 

 is about one-haK the length. The front is markedly produced. The 



