NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 119 



A complete, though sexually immature, specimen consists of 122 seg- 

 ments and measures 105 mm long. The body is entirely pale, flaccid (pre- 

 served in the tube). The prostomium is as typical of the genus, with 2 

 distinct lobes, each again divided about equally by a smaller incision. 

 There are 2 conspicuous, circular, black eyes between the bases of the 

 inner and outer lateral antennae. The styles are long, smooth, without 

 trace of wrinkling or articulation, taper to slender ends ; the longest, or 

 inner lateral, ones reach back to about the eighth setiger, the median is 

 nearly or about as long, and the outer laterals are shorter. 



The first 2 rings are apodous, the first longer than the second, at the 

 sides about 3 times as long, but at the middorsum only about l^ times as 

 long as the latter. Dorsal cirri on the second ring are long, smooth, slen- 

 der, tapering, about twice as long as the first 2 rings together. 



The first 3 pairs of parapodia lack branchiae but have long, dorsal 

 cirri that increase in length from the first; they are a little longer than 

 the length of the first 2 body rings together; the third dorsal cirrus is 

 about 11/^ times as long as the first. Thereafter they decrease in length. 

 Ventral cirri of the first 4 pairs of parapodia taper distally, the first being 

 the longest ; thereafter they are gradually thicker at the base and shorter. 

 From the fifth setiger the ventral cirrus has a thick, glandular, padlike 

 base which is marked on its anterior side by a powdeiy white, oval patch ; 

 it is prolonged distally as a papilla; this arrangement is continued for 

 about 24 segments, after which the thickened base of the ventral cirrus 

 is again reduced; farther back it gradually comes to have the form of 

 those in the anterior region except that it is shorter. The setigerous lobe 

 is short, simple throughout. 



Branchiae are present from the third parapodium, with 3 slender 

 filaments in pectinate arrangement, but greatly exceeded in size by their 

 respective dorsal cirri. On the fourth (second branchial) setiger there are 

 8 filaments, pectinately arranged, the dorsal cirrus still much stronger 

 than the stem of the branchia. The third branchial (fifth) setiger has 13 

 filaments, the dorsalmost shortest ; there is a rapid increase in number of 

 filaments to 20 at about the seventeenth setiger (pi. 8, fig. 168). By the 

 thirty-first there are again only 12 filaments, and by the thirty-fifth seti- 

 ger branchiae are absent; median and posterior regions are abranchiate. 



The first setal fascicle is smaller and weaker than those following, 

 but similar in other respects. From the second, through a long anterior 

 region, the setae are disposed in dense, crowded fascicles, consisting of a 

 supra-acicular group of longer, simple setae and a subacicular one of 

 somewhat shorter, composite setae. By the thirty-first parapodium the 



