Marsh—North American Species of Cyclops. 1093 
rami are usually without cilia; in fuscus they are thickly beset 
with cilia. 
CYCLOPS MODESTUS Herrick. 
Plate LXXVIII, Figs. 1-4. 
1883. Cyclops modestus Herrick, p. 500. 
1884. “ “ “ p. 154, pi. R, figs. 1-5. 
1887. “ “ “ p. 14. 
1893. “ “ Marsh, p. 213, pi. Y, figs. 10-13. 
1893. “ capilliferus Forbes, p. 248, pi. XL, figs. 14-17, pi. XLI, 
fig. 18. 
1895. “ modestus Herrick and Turner, p. 108, pi. XXI, figs. 1-5. 
1895. “• capilliferus Herrick and Turner, p. 109, pi. VI, fig. 13, pi. 
XXVIII, figs. 1-4. 
1909. “ modestus Byrnes, p. 26, pi. XI, figs. 4 and 5. 
A rather stout species. Cephalothorax broadly oval, its 
breadth exceeding one-half its length. The cephalothorax is 
considerably more than twice as long as the adbomen exclusive 
of the furcal rami. The first segment comprises nearly two- 
thirds of the length of the cephalothorax. The posterior lateral 
angles of the segments project very little. 
The abdomen (PI. LXXVIII, fig. 4) is very slender and 
tapers little posteriorly. The first segment equals in length the 
rest of the abdomen exclusive of the furcal rami; it is wider at 
the anterior end, and the lateral prominences are each armed 
with a minute spine. The second and third segments are about 
equal in length, while the fourth is shorter. The abdominal 
segments are ciliate on their posterior borders. 
The furcal rami are rather slender. They are about two 
and one-half times as long as the last abdominal segment. The 
inner margins are ciliate. The lateral seta is situated at about 
one-half the length of the ramus, and the ramus is peculiarly 
excavated backward from the seta. Of the terminal setae, 
the outer is short and plumose, and the inner is rather long, 
being three times the length of the outer. 
The antennae (PI. LXXVIII, fig. 2) are sixteen segmented. 
Herrick states that he has seen individuals “of a similar form” 
with seventeen segments. They reach, in the female, to the 
