Marsh — North American Species of Cyclops. 



1095 



1885. Cyclops agilis Daday, p. 240. 



1886. " " Voseler, p. 190, pi. V, figs. 29-31. 

 1890. " " Thallwitz, p. 79. 



1890. " " Lande, p. 60, pi. XVII, fig. 69, pi. XVIII, figs. 70-80. 



1891. " serrulatus Brady, p. 18, pi. VII, fig. 1. 

 1891. " agilis Forbes, p. 710. 



1891. " serrulatus Richard, p. 234, pi. VI, fig. 19. 



1891. " " Schmeil, p. 29. 



1892. " " DeGuerne & Richard, p. 11. 

 1892. " " Schmeil, p. 141, pi. V, figs. 6-12. 



1892. " agilis Lande, p. 164. 



1893. " serrulatus Marsh, p. 215, pi. VI, figs. 2-5. 

 1893. " " Richard, p. 8. 



1893. " " Scott, p. 73. 



1895. " " Herrick and Turner, p. Ill, pi. XV, figs. 8-11, pi. 



XIX, figs. 2-5, pi. XXVI, fig. 10, pi. XXIX, figs. 



17-19. 



1895. " " Marsh, p. 19. 



1897. " " Forbes, p. 54, pi. XVII, pi. XVIII, figs. 1-3. 



1897. " " Steuer, p. 34. 



1897. " " Matile, p. 131, pi. II, figs. IS and 19. 



1898. " " Brewer, p. 134. 



1901. " " Lilljeborg, p. 81, pi. V, figs. 1-6. 



1901. " macruroides Lilljeborg, p. 85, pi. V, figs. 7-11. 



1901. " varius Lilljeborg, p. 87, pi. V, figs. 12-15, pi. VI, figs, 1-9. 



1901. " " var. speratus, Lilljeborg, p. 88, pi. V, figs. 12-15. 



1901. " " " proximus, Lilljeborg, p. 89, pi. VI, figs. 1-4. 



1991. " " " brachyurus, Lilljeborg, p. 90, pi. VI, figs. 5-9. 



1903. " " Graeter, p. 489, pi. XV, figs. 6, 9, 17 and 19. 



1903. " " var. denticulata Graeter, p. 491. 



1905. " " Jensen, p. 120. 



1906. " " Brady, p. 698. 



1909. " serrulatus Byrnes, p. 27, pi. XII, figs. 1-5. 



Cephalothorax (PI. LXXIX, fig. 8) elliptical rather than 

 •oval, its breadth more than half its length. The segments do 

 not noticeably project over the following ones. The cephalo- 

 thorax is more than twice as long as the abdomen exclusive of 

 the furcal segments. 



The first abdominal segment is enlarged at the anterior end. 

 The second, third and fourth segments are about equal in 

 length. The last segment is bordered posteriorly by a row of 

 spines, and the preceding segments are commonly dentate on 

 their posterior borders. 



The furcal rami vary greatly in length. At one extreme we 

 have the short stout form, perhaps one and a half times as long as 



