ADDITION TO POLYCHAETOUS ANNELIDS 185 



less than half their length, the remainder being light straw. They 

 taper very decidedly to the apex which is curved (fig. 2.). Ventral 

 to these arises another tuft of chestnut-brown setae of varying 

 lengths but the longest are fully equal to the transverse body diame- 

 ter. In both specimens they are much disarranged and their normal 

 position is not easy to determine. They have smooth margins and 

 end in a lance-shaped apex with a subapical row of barbs on either 

 side. The pair of these barbs nearest the end are opposite one another 

 while farther down they assume an alternating arrangement (fig. 3.). 

 Eounded papillae like those on the ventral body surface occur spar- 

 ingly on the notopodial surfaces. 



The neuropodium is slender, cylindrical, and covered with globu- 

 lar papillae. About midway of its length is a slender ventral cirrus 

 which does not reach the apex of the neuropodium. The most promi- 

 nent of the neuropodial setae are, relatively to the size of the neuro- 

 podium itself, very heavy, and brown in color becoming lighter in 

 tint toward the outer ends. At the apex they bifurcate asymmetri- 

 cally (fig. 4.), the larger branch terminating in a gently curved tip 

 while there is a series of lateral teeth between the two branches. 

 Probably through accidental breaking the number of these latter 

 teeth varies, but a fairly typical one is shown in the figure. In most 

 of the parapodia examined, these were the only neuropodial setae to 

 be found but in one specimen one other kind is present. This has a 

 central axis, narrowing to an acute point. Beginning at the point 

 of narrowing and extending toward the apex, are two rows of stout 

 teeth. In some positions of the seta these appear to be opposite one 

 another but they really are both nearer one side of the axis. Figure 

 5 represents one row of teeth in full face and the other in profile. 

 Material was not available on which to determine the distribution of 

 these setae along the body and I am unable to say whether they are 

 regularly present or absent from any portion. The setae above de- 

 scribed are in general much like those figured by Mcintosh 4 but I 

 was unable to find any of the brushlike setae figured in plate 4a, 

 figures 8 to 10, in plate 5a, figures 2, 4, 8, and 9. 



The elytra are white and very delicate in texture and in both speci- 

 mens are entirely free from foreign matter. The first ones are nearly 

 circular in outline, are small but cover the prostomium. Later ones 

 are more nearly oval. Under high power the surface shows numer- 

 ous round spots with granular lines running more or less parallel to 

 one another between and around the spots. The elytra completely 

 cover the dorsum. 



4 Mcintosh, W. C. : Report on the Annelida Polychaeta collected by H. M. S. Chal- 

 lenger during the years 187.'}, 1S76. Report on the Scientific Results of the Voyage of 

 H. M. S. Challenger, vol. 12, 1885, pis. 4a and 5a. 



