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. V, figs. 10-13. 



1893. " eapilliferus 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. " eapilliferus 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 (PL 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 



