100 AKT. Ji. — A. IZUKA : 



Onuphis niacvobranchiata (Mclntusli). 



PI. Xir, ligs. 1—3. 



1885. Notliria iiiacrobiancliiata, McIutosL. " Challenger " Aiiuel., p. 32U 

 1903. Noilhia „ Moore. Proc. Acad. Nat. Sc. Philad. 



Vol. LY, p. 445. 



Body slightly narrowed in front, nearly uniformly broad for 

 the greater part of its length, though tapering again at the posterior 

 end. It measures 78mm. or more in length, and its widest part 

 about 6 mm. in breadth including parapodia. 



Prostomium with moderately elongated tentacles ; the median 

 tentacle shorter than others in adjacent position. The base of 

 external tentacles is carried farther forward than in Onupkis 

 conchylega ; the anterior tentacles are similar to those of 0. 

 conchjlega ; the 2 tentacular cirri about as long as in that 

 species. 



The first pair of parapodia are directed forward as in O. 

 conchylega ; with both dorsal and ventral cirri and a setigerous 

 lobe. 



The bristles (fig. 1) have somewhat abruptly curved tip; 

 with hooked end, and with a broad, pointed process immediately 

 beneath it. The guard extends considerably beyond the Jiooked end. 



Branchiae begin to occur on 8th segment as a small process 

 on each side ; on the 9th they are well developed and long, but 

 simple ; they continue to be of the same sliape nearly to the 

 posterior end of body, and on the 2nd in front of preanal 

 segment they still equal the parapodium in length. At the 20tli 

 parapodium the Ijranchia is more than twice as long as tlie dorsal 

 cirrus. 



