228 PROCEEDINGS OF THE ACADEMY OF [April, 



ments are strongly biannulate, the anterior annulus being slightly 

 shorter than the posterior. Each annulus is marked out in irregular 

 areas, of which there is generally but one series to each annulus, though 

 on somites IV to VII inclusive they become arranged irregularly in 

 two rows. Behind VII the thoracic segments become smooth and more 

 glandular and decrease in length, though even the last is fully one-half 

 longer than the first abdominal. 



Beginning with II, each thoracic segment bears small notopodial and 

 neuropodial tufts of very delicate, narrowly winged capillary setae in 

 the usual positions, but neither the lateral sense organs nor the genital 

 pores can be detected in surface views of these specimens. 



The abdominal segments, of which there are 190, are very short, 

 with shallow, ill-defined furrows, and are either simple rings or ante- 

 riorly obscurely biannulate. The surface is smooth, and the integu- 

 ment provided with a thick glandular coat on the anterior and a much 

 thinner coat on the posterior segments. 



The notopodial tori are very long, but not at all elevated above the 

 surface in these specimens, and bear a great number of uncini. The 

 notopodial torus is much more elevated and prominent, especially on 

 posterior segments, but is much shorter and contains a much smaller 

 number of uncini. The gills are low, rather long, inconspicuous folds. 

 The pygidium forms a narrow circumanal welt bearing two longer 

 prominently protruding ventral cirri and four much smaller ones in 

 two pairs more dorsally placed. 



The uncini (figs. 24, 25) are numerous and very delicate crochets 

 of a peculiar form. They are f-shaped with the densely fibrillated core 

 exhibiting a slight spiral turn, and the tip provided with a single bent 

 terminal process, somewhat flattened and at the base swollen and over- 

 arched by a depressed hood, the margin of which is denticulated with 

 eight or ten teeth. 



The type comes from Station 4,264, off Freshwater Bay, in Chatham 

 Strait, at a depth of 282-293 fathoms, and on a bottom of green mud ; 

 the larger but incomplete cotype was taken at Station 4,197, in the 

 Gulf of Georgia, at a depth of 31 to 90 fathoms, on a bottom of sticky 

 green mud and fine sand. 

 Travisia pupa sp. nov. Plate XI, fig. 23. 



This is a thick, stout, grub-shaped worm tapering nearly" equally 

 both ways but having the anterior end rather blunter and thicker. 

 The considerably number of examples in the collection measure from 

 24 mm. to 82 mm. in length, with corresponding diameters at the middle 

 of from 8 mm. to 32 mm. Exclusive of the pygidium there are thirty. 



