484 PROCEEDINGS OF THE ACADEMY OF [June, 



lobe the smaller but constituting most of the funnel proper, its margin 

 variable in exact shape, but always somewhat uneven and irregular, 

 crenulated or slightly toothed ; dorsal lobe much more prominent and 

 consisting chiefly of a large, flaring platform-like structure each side 

 of which has 3 blunt angular marginal prominences, bearing as many 

 slender filamentous processes nearly as long as the anal funnel. One 

 very large specimen, of which only the posterior end is preserved, 

 differs in having the ventral lobe very finely denticulated, the dorsal 

 less flaring, with an even margin and bearing 11 filaments much 

 shorter than usual. It may prove to l^e representative of a distinct 

 species as other specimens of nearly equal size are quite typical in 

 these respects. 



On the first 4 setigerous segments the setse are borne on thin wing- 

 like vertically elongated ridges, on the remainder on thick swollen 

 tori, which are especially prominent on VII. \'III and IX and on XVII, 

 XVIII and XIX; on V, VI and VII the tori are united by transverse 

 ventral thickenings, but elsewhere are quite distinct and entirely lateral. 

 The tori are anterior on the first 9, posterior on the remaining setigerous 

 somites. 



Somite II bears only capillary setse, III, IV and V a small ventral 

 series of about 6 or 7 crochets, in addition to the slender setse, the other 

 somites long ventral series of crochets, varying from 37 to 41 in each 

 group on specimens of average size, and a small dorsal tuft of slender 

 setse. 



Capillary setae have a hyaline cortex and a slightly yellowish fibrous 

 core, the more superficial fibres of which are very accurately parallel, 

 tip very acute but tapers mostly in the middle ^ of its exposed part; 

 wingless on the first setigerous somite, but farther back the cortex is 

 produced into a narrow flange on the dorsal side. 



Crochets stout, stems long, curved, tapering, with a distinct shoulder 

 at the surface of the body and beyond it a narrow region which gradu- 

 ally broadens into the beaked head. Those of the posterior regions 

 have a strong transparent hook, the base of which is concealed in a 

 hood-like covering of fibrillated spines which rise into a crest of four 

 principal teeth; guard poorly developed, of only 8 or 10 curved hairs 

 united for a considerable part of their length by an intervening deli- 

 cate web; subrostral process small. Anterior crochets on II to V 

 much less strongly hooked ; those in the middle of the series with a large 

 terminal process bent nearly at right angles to the shaft, about 4 

 smaller fibrous processes, and a beard; the dorsalmost similar but only 

 slightly bent. 



Color uniform pale grayish-browai ; tori pinkish-orange. 



