NO. 1404. PARASITIC COPEPODS—CALIGIDJE— WILSON. 617 



13. Genital segment subquadrate, as wide as long; no lobes; fonrth leg spines all 



serrate edward><i, new species, p. 627. 



13. Genital segment obovate, longer than wide; lobes very wide and blunt; no serrate 



spines pamrentris, new species, p. 635. 



13. Genital segment obovate, longer than wide; no lobes; furca branches bifid, 



branchlets acute. bifurralus, new species, p. 637. 



14. Abdomen four-jointed, as long as genital segment; the latter trapezoidal. 



j>ar\firvK (Gissler, 1883), p. 642. 

 14. Abdomen two-jointed, as long as genital segment; latter elliptical; males. 



jtiiUachii (B-Smith, 1896). 



' 14. Abdomen two-jointed, shorter than genital segment 15. 



14. Abdomen one-jointed, as long as genital segment; latter ovate; lobes short, 



pointed molrx (M-Kdwards, 1836-49). 



15. Males, both fifth and sixth legs visible; genital segment narrow-ovate; abdomen 



joints unequal no7'dmamni (M-Edwards, 1840), p. 623. 



15. Females, genital segment without any visible appendages 16. 



16. Genital segment obcordate; abdomen twice as long as wide; joints equal; 

 free segment as long as wide; fourth legs four-jointed, five spines. 



crdfiro {Kri'tyev, 1863). 



16. Genital segment ol)cordate; al)domen twice as long as wide; joints equal; 



free segment three times as wide as long; fourth legs three-jointed, four 



spines intercurrens ( Kroyer, 1863). 



16. Genital segment quadrate; alxlomen as wide as long; joints ecjual; fourth 



legs four-jointed, five spines jiectordlis (Miiller, 1776). 



16. Genital segment obcordate; basal al^domen joint four times terminal; fourth 



legs three-jointed, five spines groJivianrd { Kroyer, 1863). 



17. Alxlomen two-jointed, longer than rest of body; genital segment triangular, twice 



the carapace pharaoim ( Nordmann, 1832) . 



17. Abdomen two-jointed, longer than genital segment; females 18. 



1 7. Abdomen two-jointed, shorter than genital segment 19. 



17. Abdomen one-jointed, three times the genital segment; latter subquadrate, spiny; 



lobes short .tiores (van Beneden, 1892). 



17. Abdomen one-jointed, a little longer than genital segment 22. 



17. Abdomen one-jointed, shorter than genital segment 23. 



18. Genital segment ol)long, half the carapace; basal abdomen joint four times 



terminal longlpalptis ( B-Smith, 1898, b) . 



18. Genital segment o))long, as large as carapace; basal al)domen joint twice ter- 

 minal innom i))(itit^ new species, p. 656. 



19. Females, abdomen distinctly more tlian half as long as the genital segment; fifth 



legs concealed dorsally 20. 



19. Females, abdomen clearly less Uian half as long as the genital segment; fifth legs 



concealed in dorsal view 21. 



20. (ienital segment ovate; no lobes; fourth legs nearly reaching its tip. 



St uriunis {Krijyer, 1837). 

 20. Genital segment elliptical, lobes large; fourth legs not reaching its center. 



thoiiipsoni (Baird, 1850), p. 619. 

 20. Genital segment elliptical; lobes l)road, but short; abdomen half its width. 



salmonis (Kroyer, 1838), p. 640. 

 21. Genital segment quadrate, as wide as long; joints of the abdomen nearly eciual. 



pectoralis (Miiller, 1776). 

 21. Genital segment elongate, twice as long as wide; basal abdomen joint three times 



terminal bngri (Dana, 1852). 



21. Genital segment flask-shai)e(l, a lifth longer than wide; ])asal abdomen joint the 

 longer , ■ ij(uuh-atus (Kr<'>yer, 1863). 



