ONUPHIS PROALOPUS. 265 



Onuphis Audouin and Milne Edwards. 



Hist. nat. litt. France. Anndlidcs, 1834, 2, p. 151; Quatrkkagks, Hist. nat. aniiel6s, ISdf), 1, p. 350- 



Ehlers, Borstenwiirmer, 1868, p. 296; McIntosh, British annelids, 1910, 2, pt. 2, p. 404. 

 Northia Johnston, Cat. annelids Brit, mus., 1865, p. 136. 

 Nothria Malmgren, Annulata Polychaeta, 1867, p. 66. 

 Tradopia Baird, Journ. Linn. soc. London. Zool., 1869, 10, p. 355. 



The species of Onuphis described below may be separated by means of the 

 following : 



Key. 



a. Branchiae all simple. 

 b. Branchiae beginning on the sixth parapodia; median tentacles shorter than the posterior paired 



ones 0. lepta, sp. nov. 



bb. Branchiae beginning on the fourteenth parapodia; median tentacle longer than the posterior 

 paired ones, 

 c. Crochets of first parapodia composite; most branchiae as long as or longer than the noto- 

 cirrus, which in no case reaches halfway to the middorsal line; carrier of maxillae I broad 



caudally O. crassiselosa, sp. nov. 



cc. Crochets of first parapodia simple; all branchiae decidedly shorter than the notocirri which 

 are long, some almost reaching middorsal line; carrier of maxillae I pointed behind, triangu- 

 lar O. cobra, sp. nov. 



aa. Branchiae, at least in part, branched. 

 b. Anterior hooded crochets tridentate. 

 c. Branchiae beginning on the sixth parapodia; first parapodia extending directly forward well 



beyond middle of prostomiima 0. j/roalopus, sp. nov. 



cc. Branchiae beginning on the fifth parapodia; first parapodia oblique, not passing middle of 



prostomium O. nannognathus, sp. nov. 



66. Anterior crochets bidentate. 



c. Branchiae beginning on the seventh parapodia O. litabranchia, sp. nov. 



cc. Branchiae beginning on the sixteenth or seventeenth parapodia. 



d. Branchiae beginning on the sixteenth parapodia; ceratophores of tentacles widest at middle, 

 narrowed at both ends; end piece of pectinate setae short and broad. 



O. pachytmema, sp. nov. 



dd. Branchiae beginning on the seventeenth parapodia; ceratophores strictly cylindrical; 



distal division of pectinate setae very long and narrow 0. soda, sp. nov. 



Onuphis proalopus, sp. nov.^ 

 Plate 40, fig. 3-8; Plate 41, fig. 1-10. 



The general color is brown, paler on each side in a stripe adjacent to the 

 parapodia, these with their cirri and branchiae being yellowish. In the anterior 

 region there is a somewhat obscure middorsal and midventral longitudinal whitish 

 stripe. The tentacles are yellow. 



The type lacks the posterior portion. The fragment present is 65 mm. 

 long with a maximum width, exclusive of parapodia, of 2 mm. It consists of 

 one hundred and eighty-two somites. 



\irpoaX7is, springing forwards, and ttoOs, foot. 



