244 PROCEEDINGS OF THE ACADEMY OF [April. 



swollen glandular tori form the entire length of the segment and bear 

 the uncini along the middle. Although XXII and XXIV are achsetous 

 they are similarly constituted. 



The head and first four segments are very smooth, iridescent and of a 

 uniform deep purple color above. The next three segments are smooth 

 and dull yellowish throughout; those of the middle region have pale 

 anterior glandular zones, the rest being yellowish and roughened, while 

 posterior segments are pale throughout and thin-walled, except for 

 the ventral longitudinal bands and posterior glandular zones. 



The peristomium and two preanal segments are achaetous. Somites 

 II, III and IV have a single stout spine situated at about the end of 

 the anterior one-third of the segment and about twice as far from the 

 dorsal as from the ventral median line. A little above and in front of 

 this is a short vertical series of capillary setae. On the remaining 

 segments the setae form more prominent tufts arranged in vertical 

 series midway on the sides of the body and in the middle of the glandu- 

 lar area which lies on the anterior end of the somites as far as about 

 XV, then for some segments on the posterior end, and finally, with 

 the disappearance of the non-glandular region, occupies the entire seg- 

 ment. Uncini occur on all segments from V to XXII inclusive. They 

 are in all cases arranged in a single series in the same plane as the 

 setae, and extend in a line, for a greater or less distance according to 

 their number, on to the ventral surface. On the anterior segments 

 they are slightly larger and fewer, the number counted in the type 

 being 7 to 9 on V, 16 to 19 on X and 10 to 12 on XXII. 



The single ventral spines on II, III and IV are stout, fibrous and 

 yellow, tapering to a slightly curved, blunt, hard point. On the same 

 segments the notopodial tufts contain about six longer, stouter setae 

 (fig. 44) with longitudinally striated stems tapering to stiff, straight, 

 acute tips and provided with a broad and extensive wing on one side 

 and a very narrow one on the other; also a corresponding number, 

 arranged in a parallel row, of much shorter, more delicate setae (fig. 43) 

 with nearly wingless stems tapering to a long hair-like and very delicate, 

 flexible tip provided on each side with minute cilia-like hairs. The latter 

 are so minute that they are visible vmder high powers only. Except 

 for a slight increase in number the stouter setae remain unchanged 

 throughout, but the more delicate ones become considerably modi- 

 fied. By about the tenth 'segment they have become more numerous; 

 some of them (fig. 43) are only moderately elongated (about as much 

 or only slightly more than those of the preceding segments), but the 

 lateral processes have become much larger, ensheathing and awn- 



