414 THE ANNELIDA POLYCHAETA/ 



wide, and the eighth as long as wide, the measurement being 4 mm. each way, 

 while all the succeeding somites are longer than wide. The penult somite in 

 the type is 3.5 mm. long and 1.5 mm. wide, not clearly limited from the anal 

 funnel; the antepenult 4 mm. long and 1.7 mm. wide; the next cephalad 4 mm. 

 long and 2.4 mm. wide; the next 4.4 mm. long by 2.5 mm. wide; the preceding 

 one 4.5 mm. long by 2.6 mm. wide; and the next cephalad equal in length and 

 breadth, which is 3 mm., this being the shortest somite in the caudal region, 

 the more anterior ones again increasing in length, the immediately preceding 

 one being in the type 4 mm. long by 3.4 mm. thick. Anterior somites with the 

 anterior edge somewhat thickened and extending cephalad so as to embrace 

 the caudal end of the preceding segment, but none have a true collar. Each 

 of the first seven postcephalic somites bears setae at the anterior end, the eighth 

 bears them at both ends, this being a double segment, while the following 

 somites bear setae only at the posterior end, the setae being at from one third 

 to one fourth the length from the caudal end. 



Anal funnel wider than long. Its width is 2.5 mm., being thus much nar- 

 rower than the widest somites farther forward. It is widely flaring, evenly 

 campanulate, in form from near its middle distad, but somewhat compressed 

 from side to side. The anterior region of the funnel much narrower, only 1.5 

 mm. thick in the measured specimen. Free margin of the funnel with from 

 twenty-one to forty equal teeth, of which some may be double. No midventral 

 tooth or cuTus. Anus on a finely ribbed cone which usually extends distinctly 

 beyond the margin of the funnel caudad. (Plate 72, fig. 3). 



No setae on the head and only the notopodial capillary setae present on 

 the first somite. On the succeeding setigerous somites there are, in addition 

 to the capillary setae, also the ventral uncini which are numerous and uniseriate, 

 borne on conspicuous tori, as usual. There are mostly near eighteen or twenty 

 uncini in a series on the second somite, thirty to thirty-five on the third. No 

 setae on the three somites preceding the anal funnel. Posterior capillary setae 

 pale yellow, rather long, those of the posterior somites near 2.5 mm. in length. 

 They are nearly smooth, distally tapering to a long and exceedingly fine point, 

 the distal portion more or less curved, on the convex side and extending some 

 distance below the curved part a very narrow and inconspicuous limbus. Each 

 seta with a thin, denser vitreous cortex, the medullary portion traversed by 

 numerous, very fine, and regular fibrillae. The anterior capillary setae arranged 

 in a row inserted at bases of the posterior ones; much shorter and very much 

 more slender than the posterior setae, the diameter of the latter being between 

 four and five times as great as that of the former (nearly as 4.5:1.); ending in 



