184 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



specimens in the Challenger collection as varieties of this species, 

 and it may be that these from the Philippines should be so identified. 

 The main differences between these and those of Mcintosh lie in the 

 character of the setae and in the fact that in his varieties the ones 

 which most nearly approach these in other respects have consider- 

 able covering of felt which is absent in the Philippine individuals. 



The longer specimen has a body length of 22 mm. and a width of 

 8 mm., the smaller is 15 mm. long and 6 mm. wide. There are 35 

 somites, and 15 elytra is evidently the normal number, though in 

 neither case were all of these present. 



The prostomium (fig. 1), in the smaller specimen is about 0.75 mm. 

 wide, globular in form with the ceratophore of the median tentacle 

 and the two ocular peduncles covering the anterior quarter of its 

 circular outline. Toward the posterior end of the dorsal surface is 

 a decided elevation which posteriorly is continued laterally on either 

 side by a ridge which merges into the base of the prostomium. Its 

 posterior margin is overlapped by a fold from the first somite. The 

 eyes are carried on short peduncles and are rather small, only the 

 dorsal ones being visible from the dorsal surface. The ventral eyes 

 are about the same size as the dorsal and lie a little nearer the outer 

 margin of the peduncle than do the dorsal. 



The ceratophore of the median tentacle is nearly one half as broad 

 as the prostomium, its base more or less corrugated and tinged with 

 brown. One specimen had lost the median tentacle and it was broken 

 from the other before an accurate description could be recorded so 

 that the most I can say is that it was slender and longer than the 

 prostomium. The palps are from eight to ten times as long as the 

 prostomium, are smooth as seen under a dissecting lens, but under 

 higher magnification show large numbers of short " cilia " over 

 their entire surfaces. The dorsal cirri are slender and taper gradu- 

 ally toward the end but l\ave a small bulbous swelling toward the 

 apex. They are fully equal in length to the transverse diameter of 

 the body. There is no well-marked ventral groove but the entire 

 ventral surface is covered with minute rounded papillae giving it a 

 rugose appearance. 



The body tapers very decidedly at both anterior and posterior ends 

 and the parapodia in these regions are correspondingly small, those 

 at the anterior end extending lateral to the mouth in the customary 

 fashion. Parapodia from the middle of the body have large trun- 

 cated notopodial lobes and slender cylindrical, neuropodial ones. 

 Arising from the dorsal surface of the lobe and extending postero- 

 lateral^ over the elytron or the cirrus as the case may be, is a fan- 

 shaped row of slender setae, dark yellowish -brown in color for rather 



