1905.] NATURAL SCIENCES OF PHILADELPHIA. 549 



The dissected jaws are shown in ventral view in fig. 44. With the 

 exception of the mandibles they are dark brown. The maxilhe are 

 slender, very strongly curved and acutely pointed ; their expanded and 

 excavated bases are borne on separate carriers which are deeply emar- 

 ginated about the middle of the outer margin, but have the contiguous 

 but distinct median margin straight. A narrow horny bow extends 

 from the lateral and distal angle of each carrier to the corresponding 

 second dorsal jaw. There are 3 pairs of dorsal jaws. The large pos- 

 terior pair are broadly arcuate, connected posteriorly with the maxillae 

 carriers by a narrow bar and bear 5 or 6 acute, strongly curved teeth 

 and a blunt tubercle. The second pair are triangular, with smooth 

 sides and a single stout claw-like apical tooth. The anterior are similar, 

 but with the base rather trapezoidal in shape. Unlike the other jaws 

 the mandibles (fig. 30) are white with longitudinal streaks of pale 

 brown, the distal margin wide and irregularly denticulate, with a promi- 

 nent lateral angle and the base slender. They are very hard and brittle. 



N. simpla differs widely from all described species of Ninoe known 

 to me in the form of the gills and the presence of the mammiliform tu- 

 bercle or rudimentary median tentacle on the prostomium. The 

 branchial process corresponds to the dorsal limb of the gill of A'^. nigripes, 

 N. palmata, etc., but the palmate gill of these species is wanting, though 

 its base is represented by the expanded portion of the postsetal lobe. 



This species was taken in Behm Canal, Alaska, only, at stations 4,235, 

 4,236 and 4,238, on muddy bottoms, in 130 to 229 fathoms. 



Goniada annulata sp. nov. PI. XXXVI, figs. 45 to 48. 



The length of mature specimens considerably contracted in alcohol 

 is from 70 to 90 mm., the greatest width to the tips of the parapodia 

 (not including setse) about 3 mm. The prostomium, which is broadly 

 coalesced with the peristomium at the base, is depressed and about 

 twice as long as its basal width or about equal to the first 6 or 7 somites; 

 it is distinctly divided into 5 rings, of which the first equals the total 

 of the others which successively diminish in both length and breadth, 

 the last being minute and apparently sometimes absent. A wavy 

 longitudinal groove on each side of the head is joined by the transverse 

 furrows, which do not correspond above and below, and meets the 

 nuchal organs behind ; there is also a faint longitudinal ventral furrow. 

 The apical tentacles diverge diagonally from the tip of the prostomium ; 

 the dorsal pair, which are slightly the longer, about equalling the trans- 

 verse diameter of the last ring. Eyes appear to be absent. The palpi 

 are small, low, rovmded, immobile and widely separated on each side of 

 the mouth. 



