226 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 



the annuli become relatively longer and from this point to XX the 

 segments are slightly longer than wide; beyond XX to the end of 

 the piece (XXVII) they are more slender and about 50% longer 

 than wide, but this region is somewhat distorted. Intersegmental 

 furrows also disappear at XX and the tori shift to the caudal region 

 on XXI. Pygidium unknown. 



The first seven setigerous somites bear stout spines, the others 

 crochets in tori, though the first four pairs of tori (IX to XII inch) 

 are indistinct as are also the glandular areas On XIII both are 

 well developed and on XIV prominent, the tori forming conspicuous 

 ventro-lateral swellings and the glands complete whitish zones, 

 which ventrally and laterally cover all of the somite anterior to 

 and including the parapodia and dorsally are reduced to a narrow 

 band. After XX the glandular zones become narrower and shift 

 with the tori caudad. 



Somites II to VIII bear small lateral tufts of setse and immedia- 

 ately ventral to them one or two stout spines At XIII definite 

 tori with crochets begin, while IX to XII are intermediate, bearing 

 two to five transitional, nearly sessile crochets. The number of 

 crochets is always small, being on middle segments 9 to 11, arranged 

 in a single row. 



Setae of anterior bundles are of two forms, most of them small, 

 narrowly bilimbate and very slender lanceolate, the others longer 

 and lacking margins altogether. Further back they all tend toward 

 the latter type, the limbate setse being reduced both in number 

 and distinctiveness. At the caudal end, while the number of 

 setse is not increased, the length of individual setse is about doubled, 

 resulting in much greater prominence of the fascicles. These 

 posterior setse are very slender, straight and smooth, except at 

 the tip where fine asperities cause them to become coated with 

 foreign matter. All notopodial setse are colorless and exhibit 

 only the very faintest internal striations. 



Anterior spines (Plate XVIII, fig. 31) are of a deep brownish-yellow 

 color, strongly striated internally and all more or less stout, tapering 

 towards the ends and slightly curved. Most of them have weak 

 claw-like tips but some are nearly straight and simply taper to 

 blunt points. From XIII at least crochets are all of one kind; stem 

 and shoulder cannot be well made out in the preparation but the 

 exposed part as shown in figure 32 bears a stout beak and a crest of 

 four main teeth with the usual lateral brush and a broad guard 

 divided in halves, each ending in a frayed filament. 



The cephalic end, including the head and segments to XIII, 

 bears a conspicuously maculated pattern of small rounded or 

 somewhat irregular brown spots most numerous dorsally and 

 anteriorly and gradually fading away ventrally and caudally. 

 They present no definite pattern but it is noticeable that the 

 largest spots are frequently arranged symmetrically on the dorsum 



