84 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



15. TV. minuta Mcintosh (1885, p. 334) from New Zealand, in 700 

 fms. 



16. A^. notialis Monro (1930, p. 129) from the Antarctic. 



17. N. opdina Verrill (1873, p. 98) from New England. 



18. N. pallida Moore (1911, p. 256) from California, in 302-585 fms. 



19. N. pycnobranchiata Mcintosh (1885, p. 317) from off Chile, in 

 2,225 fms. 



20. N. rubrescens (Augener) (1906, p. 139) from the West Indies, in 

 about 163 fms. 



21. N. setosa (Kinberg) (1865, p. 560) from off the La Plata River. 



22. N. sombreriana Mcintosh (1885, p. 310) from the West Indies, in 

 390-470 fms. 



23. N. stigmatis (Treadwell), p. 89. 



24. N. tenuisetis Mcintosh (1885, p. 307) from New Zealand, in 700 

 fms. 



25. N. willemoesii Mcintosh (1885, p. 322) from off Amboina, in 100 

 fms. 



Among those listed above, the following 5 were described as abranch- 

 iate, hence might be referred to the genus Paradiopatra Ehlers if that 

 genus has validity (but see p. 45) : N. abranchiata, N. fragilis, N. 

 minuta, N, notialis, and A^. sombreriana. 



In addition to those listed, there are 3 groups of individuals that bear 

 many resemblances to N. stig?natis, but consistently differ in certain re- 

 spects; they are designated subspecies (below). 



As in the genus Onuphis (p. 66) species of Nothria can also be ar- 

 ranged according to the presence or absence of certain characteristic setae. 

 In 2 species, N. elegans and A^. gorgonensis, anterior hooded hooks in- 

 clude both bidentate and tridentate forms ; both of these species lack com- 

 posite spinigers and heavy acicular hooks. All the other species discussed 

 below have typically tridentate hooded hooks in some anterior segments 

 and only rarely bidentate or quadridentate hooks. Among these N. irides- 

 cens and N. pallida lack composite spinigers and acicular hooks in anter- 

 ior segments ; N. stig?natis and its subspecies have composite spinigers and 

 acicular hooks in some anterior segments. For most of the species listed 

 above, the presence or absence of these parts is unfortunately not defi- 

 nitely known. 



Key TO Species of Nothria 



1. Anterior hooded hooks are tridentate 3 



1. Anterior hooded hooks include bidentate and tridentate ... 2 

 1. Anterior hooded hooks are bidentate 8 



