212 Marsh—Cyclopidce and Galanidoe of Wisconsin. 
1878. C signatus Brady (18), p. 100, pi. XVII, figs. 4-12. 
1876. “ tenuicornis Brady (18), p. 102, pi. XVIII, figs. 1-10. 
1883. “ “ Cragin (24), p. 3, pi. II, figs. 1-14. 
1883. “ signatus var . fasciacornis Cragin (24), p. 2, pi. II, 
fig. 15. 
1884. “ tenuicornis Herrick (26), p. 153, pi. R, fig. 16. 
1885. “ V Daday (27), p. 211. 
1885. “ signatus Baday (27), p. 208. 
1886'. “ “ Vosseler (28), r p. 189, pi. IV, figs. 1-5. 
1886. “ tenuicornis Vosseler (28), p. 189, pi. IV, figs. 6-10. 
1891. “ gyrinus Forbes (35), p. 707, pi. II, fig. 9; pi. Ill, 
fig. 14. 
1891. “ albidus Schmeil (37), p. 23. 
1891. “ signatus Brady (36), p. 6, pi. 2, fig. 5. 
1891. “ fuscus Richard (39), p. 223, pi. II, fig. 6. 
1891. “ annulicornis and tenuicornis Richard (39), pp. 224- 
226. 
1892. “ fuscus Schmeil (41), p. 123, pi. I, figs. 1-76; pi. IV, 
fig. 2, 
1892. u 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 11 forms which combine the charac¬ 
ters of signatus and tenuicornis , and it would seem that the 
existence of such “bastards 11 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. 
