52 University of California Publicaiions in Zoology [Vol. 18 



setae. The subdistal end is covered with strong serrations, while the 

 slender extreme distal portion and also the greater part of the 

 proximal end is entirely smooth without any serrations. The extreme 

 ventral neurosetae (pi. 3, fig. 21) are very much shorter than are 

 those near the center, being about one-half or less the length of the 

 latter. They are strongly curved, with the fine distal end slightly 

 bent, and the convex subterminal portion strongly serrated. 



The notosetae are of two distinct kinds. There are about half a 

 dozen or more of fine dorsal setae (pi. 3, figs. 19 and 20) near the 

 neuropodium. They are about equal in length to the long neurosetae, 

 curved, attenuating very gradually and ending in very fine, almost 

 capillary tips. The distal convex side is covered with spinous rough- 

 enings (pi. 3, fig. 20). The notosetae of the other kind are numerous, 

 arranged in rows, each row consisting of 6 to 10 setae thus making a 

 total of about 50 or more notosetae on each parapodium. The dorsal- 

 most rows contain the shortest setae. The length of the setae increases 

 with each succeeding row ventrad, until the maximum length is 

 reached in the last row nearest to the neuropodium, the setae there 

 being about twice the length of the shorter setae from the dorsal most 

 rows. The setae are stout, perfectly smooth without any roughen- 

 ings or serrations, uniform in width, tapering very abruptly towards 

 the distal end (pi. 3, fig. 18). 



There are fifteen pairs of elytra occurring on segments 2, 4, 5 

 and on all alternate segments to 23, then on segments 26, 29, and 32. 

 The elytra (pi. 3, fig. 13) are kidney-shaped, large, widely overlap- 

 ping, and thickly covered with chitinous tubercles (pi. 3, fig. 15). 

 Fine venations radiate from the elytrophore in all directions. 



The nephridial papillae begin with the sixth segment, occurring 

 thence posteriorly on all segments. They are short, inconspicuous, 

 and uniform in diameter. 



Comparison. — The polynoid bears some resemblance to Harmothoe 

 coniplanata Johnson (1901), and might even be considered as a sub- 

 species of the latter. It differs, however, from Harmothoe complanata 

 in the shape, and the relative dimensions of the body, the shape and 

 the size of the prostomium, the shape of the parapodia and in the 

 structure of the notosetae. In Harmothoe complanata the breadth of 

 the body including the setae, is two-sevenths of the length, while in 

 Harmothoe johnsoni the breadth including the setae is one-third of 

 the length. The prostomium of Harmothoe complmiata is equal in 

 width and length, in Harmothoe johnsoni the prostomium is decidedly 



