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BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



inner paired and the median tentacles are equal in length, all very 

 long, as long as the first 25 somites (fig. 3, a), and they narrow to 

 blunt points. The styles of the outer paired tentacles are shorter 

 than the others in the proportion of 3 : 13. The frontal palps are 

 shorter than the cirrophores of the tentacles and are not visible 

 from the dorsal surface. The nuchal cirri are slender and extend 

 to the apices of the tentacular cirrophores. The eyes are obscure, 

 situated behind the bases of the outer paired tentacles. 



The gills begin as a slender filament on the first setigerous somite. 

 In one specimen they become 2-branched on the fourth and 3- 

 branched on the sixth. They are longest and most prominent in 



Figure 3. — Onuphis tranchiata, new species : a, Head, 

 X 5 ; 5, first parapodium, x 10 ; c, tenth parapodi- 

 um, X 10 ; d, seta from twenty-fifth parapodium, 

 X 180 ; e, seta from first parapodium, X 180 ; 

 f, maxilla, X 17 ; g, mandible, X 17 



the regions of somites 20 to 40, where they have five slender 

 branches and are long enough to meet over the dorsal surface of 

 the body. In one fragment of more than 100 somites they con- 

 tinued to the end. Lack of complete individuals makes it impossible 

 to tell how far they extend in the entire animal. 



In the first setigerous somites the dorsal cirri are rather heavy. 

 Farther back they are as slender as the gill branches. On the first 

 five setigerous somites the ventral cirri are fleshy and sharp-pointed, 

 and extend beyond the apex of the parapodium. On the seventh 



