536 PROCEEDINGS OF THE ACADEMY OF [July, 



just beneath the cortical layer and more or less completely annular. 

 The nenropodials are somewhat longer and more slender. They have 

 more slender, longer and more curved tips and longer lateral spurs than 

 the notopodial setae just described and in some cases at least the cavity 

 is not bifurcate (fig. 13). The setae of the middle region depart remark- 

 ably little from the exact forms figured for the three kinds. 



This species appears to resemble E. maculata Horst rather closely, 

 but is readily distinguished by the position of the middle cirrus, which 

 is between the second and third gills in the latter. From E. hetero- 

 hranchia Jonnson the absence of smooth cleft notopodial setae especially 

 distinguishes it, while E.aurantiaca Johnson and E.superha Marenzeller 

 both have a smaller number of gills, longer spurs to the notopodial setae 

 and other distinguishing features. 



This species is much less common than E. hicirrato, and was taken 

 at stations 4,272 and 4,274 only, in Chilkoot Inlet, Alaska, in 45 to 73 

 fathoms. 

 Eunoe depressa sp. nov. PI. XXXIV, figs. 17, 18, PI. XXXV, figs. 19 and 20. 



An interesting species of at least partially commensalistic habits. 

 The type is 30 mm. long, 11 mm. between the tips of the parapodia, 

 and 14 between the tips of the setae at XVII, the broadest somite. The 

 largest specimen is 40 mm. long. 



The prostomium is about as long as broad, divided anteriorly by a 

 deep median furrow which reaches half its length; its lobes produced 

 into divergent, widely separated and prominent peaks. Of the two 

 pairs of eyes the anterior are slightly the larger, strictly lateral and at 

 the widest part of the prostomium near the middle; the smaller pos- 

 terior pair dorsal, less widely separated and close to but distinctly 

 anterior to the posterior margin of the prostomium. All of the cephalic 

 appendages are short and stout. The median tentacle is barely 2^ 

 times the length of the prostomium, its base very short and stout; the 

 proximal f of the style thick and little tapered, ending in a slight en- 

 largement beyond which it abruptly contracts into a delicate terminal 

 filament; its surface is covered with numerous but short cilia. The 

 lateral tentacles arise entirely ventral to the median, close to the 

 median line and quite inside the line of the peaks; they are stout, taper 

 gently for about the proximal f and beyond that are contracted 

 abruptly into a terminal filament; the ciliation is sparse. The palpi 

 are stout, short, in all 4 specimens much shorter than the median ten- 

 tacle, the terminal filament of which they barely reach; their own 

 terminal filament is minute ; their cilia are arranged along a few longi- 

 tudinal lines. The tentacular cirri resemble the median tentacle, which 



