216 Marsh—Cgclopidce and Calanidce of Wisconsin. 
three-fourths as long as the furca, projecting laterally from the 
body. At the other extreme is the pelagic form, C. elegans Her¬ 
rick. It averages 1.25 mm in length. The furca is once and a 
third as long as the last two abdominal segments, and the ex¬ 
ternal terminal seta is short and weak. 
Sometimes the two forms occur together in pelagic collec¬ 
tions, but only once have I found the elegans form as a littoral 
species. The European form is, in its characteristics, interme¬ 
diate between these extreme forms. 
Although the extreme varieties sometimes occur together, 
they are almost always entirely distinct. In only two localities 
have I found connecting forms. In Heart Lake I found an in¬ 
termediate form associated with the smaller variety, and in 
Lake Puckaway I found the typical form in connection with 
both extremes. 
Cyclops phaleratus Koch. 
1841. 
1851. 
1853. 
1857. 
1863. 
1863. 
1863. 
1872. 
1874. 
1875. 
1878. 
1882. 
1883. 
1884. 
1885. 
1887. 
1891. 
Plate VI, figs. 6 and 7. 
C. phaleratus Koch (3), H 21, pi. IX. 
“ canthocarpoides Fischer (5), p. 246, pi. X, figs. 24, 
32-38. 
Lilljeborg (6), p. 208. 
Claus (7), p. 37, pi, I, figs. 6-10. 
“ (9), p. 102, pi. IV, figs. 1-4. 
“ “ Lubbock (10), p. 202. 
“ phaleratus Sars (11), p. 46. 
“ canthocarpoides Fric (13), p. 223, fig. 19. 
“ lascivus Poggenpol (14), p. 72, pi. XV, figs. 22-24; 
pi. XVI, figs. 7 and 8. 
“ phaleratus Uljanin (15), p. 38, pi. IX, figs. 1-5. 
Brady (18), p. 116, pi. XXIII, figs. 7-13. 
“ ctdolescens Herrick (23), p. 231, pi. VI, figs. 16-20. 
“ perarmatus Cragin (24), p. 7, pi. I, figs. 9-18. 
“ phaleratus Herrick (26), p. 161, pi. R, figs. 6-10. 
Daday (27), p. 252. 
Herrick (30), p. 14, pi. VII, fig. 2, a-d. 
" “ Schmeil (37), p. 36. 
