COPEPODS OF THE WOODS HOLE REGION 599 



7. Brood pouch large and gibbous; caudal rami long, with minute 



apical hairs; distal segment of fifth leg twice as long as wide; 



in ascidians c? 9 Doropygus Thorell, 1859 (p. 387) 



Brood pouch small, not gibbous; caudal rami short, unarmed; 

 distal segment of fifth leg as wide as long, with 1 apical seta; 

 in ascidians d^ ? Doropygella G. O. Sars, 1921 



8. Males, urosome 5-segmented; first endopods longer than the 



exopods; first antennae 8-segmented; second antennae 3-seg- 



mented, with apical claw; in ascidians cf Enterocola Beneden, 1860 



Males, urosome 4-segmented; first exopods longer than the 



endopods 9 



Females, urosome 4-segmented; eggs carried in a brood pouch 10 



9. First antennae 6-segmented; caudal rami four times as long as 



wide, each with 4 apical and 1 outer setae; no spines on ventral 



surface; in ascidians c? Ascidicola Thorell, 1859 



First antennae 8-segmented; caudal rami twice as long as wide, 

 their ventral surface spiny; longest seta as long as ramus is 

 wide; in ascidians cf Bonnierilla Canu, 1891 



10. Brood pouch covering last 4 metasome segments, not extending 



farther backward and bluntlj' rounded at its posterior end; 



in ascidians 9 Bonnierilla Canu, 1891 



Brood pouch confined to fifth metasome segment, but extending 

 beyond tip of caudal rami and sharply pointed; in ascidians. 



9 Goniodelphys Buchholtz, 1869 



11. Males, urosome 4-segmented; first antennae 6-segmented; 



caudal rami four times as long as wide, each with 4 apical 



and 1 outer plumose setae; in ascidians cf Ascidicola Thorell, 1859 



INlales, urosome 2-segmented; first antennae 7-segmented; 

 caudal rami fingerlike, twice as long as wide, each with a 

 single apical seta; in ascidians cf Enteropsis AurivilUus, 1885 



Females, urosome 5-segmented; first antennae 9-segmented; 

 caudal rami four times as long as wide, each with 4 terminal 

 and 1 outer setae; in sediment 9 Pseudonotodelphys Gurney, 1927 



Females, urosome 4-segmented; eggs carried in a brood pouch 12 



12. Second antennae 3-segmented, tipped with a weak claw and 2 



or 3 setae 13 



Second antennae 2-segmented, tipped with a single apical claw 14 



13. Brood pouch ovoid; caudal rami slender and twice as long as 



the urosome, tipped with small hairs; fifth legs whoUj' 



lacking; in ascidians 9 Notodelphyopsis Schellenberg, 1921 



Brood pouch wider than long; caudal rami no longer than anal 

 segment, with 2 apical claws; each fifth leg replaced by 2 

 setae; in ascidians 9 Hypogastrion Wilson, 1924 



14. First antennae 9-segmented; caudal rami as long as last 2 



urosome segments, or longer; all 4 pairs of swimming legs 



symmetrical; in ascidians 9 Paranotodelphys Schellenberg, 1921 



First antennae 8-segmented; caudal rami no longer than anal 

 segment; first pair of legs symmetrical, second, third, and 

 fourth asymmetrical; in ascidians 9 Bonnierilla Canu, 1891 



15. Head with lateral wings; fifth legs 2-segmented; second anten- 



nae in female 3-segmented, with an apical claw, in male 

 2-segmented and chelate; in ascidians. 



cf 9 Lonchidiopsis Vanhofl'en, 1917 

 Head without lateral wings; fifth legs 1-segmented, or lacking 16 



