212 



Marsh — Cyclopidce and Calanidce of Wisconsin. 



1878. 

 1876. 

 1883. 

 1883. 



1884. 

 1885. 

 1885. 

 1886. 

 1886. 

 1891. 



1891. 

 1891. 

 1891. 

 1891. 



1892. 



1892. 



C 



signatus Brady (18), p. 100, pi. XVII, figs. 4-12. 

 tenuicornis Brady (18), p. 102, pi. XVIII, figs. 1-10. 



Cragin (24), p. 3, pi. II, figs. 1-14. 

 signatus var. fa sciacornis Cragin (24), p. 2, pi. II, 



fig. 15. 

 tenuicornis Herrick (26), p. 153, pi. R, fig. 16. 



Daday (27), p. 211. 

 signatus Daday (27), p. 208. 



Vosseler (28), F p. 189, pi. IV, figs. 1-5. 

 tenuicornis Vosseler (28), p. 189, pi. IV, figs. 6-10. 

 gyrinus Forbes (35), p. 707, pi. II, fig. 9; pi. Ill, 



fig. 14. 

 albidus Schmeil (37), p. 23. 

 signatus Brady (36), p. 6, pi. 2, fig. 5. 

 fuscus Richard (39), p. 223, pi. II, fig. 6. 

 annidicornis and tenuicornis Richard (39), pp. 224- 



226. 

 fuscus Schmeil (41), p. 123, pi. I, figs. 1-76; pi. IV, 



fig. 2, 

 albidus Schmeil (41), p. 128, pi. I, figs. 8-146; pi. 



IV, fig. 14. 



Brady considers signatus as the ultimate form of which tenui- 

 cornis is the penultimate. The serrated ridge on the last an- 

 tennal joint must be considered, then, as not distinctive of the 

 species, but of the ultimate stage of the species. With this 

 opinion I am inclined to agree, although I have not material 

 to demonstrate their identity. Schmeil (41) discusses the re- 

 lations of the two forms in detail, and gives his reasons for be- 

 lieving them specifically distinct. In this same paper, however, 

 he describes certain "bastard" forms which combine the charac- 

 ters of signatus and tenuicornis, and it would seem that the 

 existence of such "bastards" would be a strong argument in 

 favor of the identity of the forms. 



C. signatus is a widely distributed species, being found in 

 northern and western Europe, and in Great Britain, as well as 

 in North America. It occurs in standing pools, but is more 

 common in the lakes, being found in both pelagic and littoral 

 collections. 



