Marsh — North American Species of Cyclops. 1101 



pools, and is world wide in its distribution, although not abun- 

 dant anywhere. 



The question of the identity of our form with that of Europe 

 has been discussed by Schmeil, and I think we must agree 

 with his conclusion. Really the only reason for separating 

 our form is the fact that it ordinarily has eleven segments in 

 the antenna. If we recognize this as a specific difference we 

 should call the American form perarmatus Cragin. 



CYCLOPS VARICANS Sars. 



1862. Cyclops varicans Sars, p. 252. 



1875. " orientalis Uljanin, pp. 33-34, pi. VII, figs. 10 and 11; pi. X, 

 figs. 8-13; pi. XI, figs. 1 and 2. 



1890. " varicans Lande, p. 64, pi. XVIII, figs. 81-90. 



1891. " " Schmeil, p. 33. 



1892. " " Lande, p. 164. 



1892. " " Schmeil/p. 116. pi. VI, figs. 1-5. 



1893. " " Richard, p. 8. 



1895. " " Herrick, p. 116, pi. XIX, figs. 12-13; pi. XXX, 



figs. 2-8. 



1895. " " Richard, p. 1. 



1897. " " Forbes, pp. 63-64. 



1897. " " Matile, p. 130, pi. II, fig. 17. 



1897. " " Scott, p. 322, pi. IX, figs. 26-28. 



1901. " " Lilljeborg, p. 72, pi. IV, figs. 23, 24. 



1903. " " Graeter, p. 528, pi. XV, figs. 22, 25. 



1905. " " Van Douwe, p. 682. 



1906. " " Pearse, p. 249. 



1909. " Ucolor Byrnes, p. 29, pi. XIII, figs. 1-5. 



This is a species of world wide distribution, and it would 

 be expected in our American fauna. I have never found it in 

 any of the collections that have come under my observation. 

 It is mentioned by Herrick, E. B. Forbes and Pearse as being 

 found in America. Herrick states that he found it but once. 

 His figures are not exact, but he gives twelve segments in the 

 antenna of the female which should distinguish it from the 

 closely related form bicolor. Forbes speaks of it as fairly 

 common in America, but he gives neither description nor figures. 



Pearse states that he found it on Nantucket Island, but he 

 too, gives neither description nor figures. 

 8— S. & A.— 3 



