1903.] NATURAL SCIENCES OF PHILADELPHIA. 437 



teeth, the marginal ones of which are only slightly and subequally pro- 

 longed. 



Acicula black and opaque; orcUnary kind two or occasionally three, 

 tapering rather suddenly to a blunt, curved tip; posterior ventral ones 

 rather strongly sigmoid, the tip hooked, bifid, ^ith a broad, well- 

 marked, striated guard. 



All of the jaws, except the anterior lateral, which are brown, have a 

 peculiar hoary appearance. Mandibular carriers slender, about 2^ 

 times as long as the calcareous plates ; the latter roughly triangular, 

 the posterior internal angle broadly rounded, the most acute angle 

 anterior and somewhat divergent; medial side shortest, convex, with 

 a small process which joins its mate; anterior margin concave and 

 posterior convex ; 2 anterior teeth besides the angle. 



Maxilla slender, the carrier small and without a constriction. Pos- 

 terior lateral plate triangular, with a transverse joint about the middle, 

 with 5 teeth and a posterior compressed margin on the left, 6 teeth and 

 a longer toothless margin on the right. Anterior group of 2 right and 

 3 left jaws; the dorsalmost rather large, divided into 2 in each case and 

 bearing a single rather broad tooth ; the second long on the right, with 

 11 fine teeth, shorter on the left, with only 5; unpaired left jaw with 

 8 teeth. 



Sagami Bay, 3,698, 153 fms. 

 Eunice mucronata sp. nov. (PI. XXV, figs. 42-45.) 



Size small, the largest entire worm having a length of 110 mm. 

 exclusive of the cephalic and caudal appendages, but other incomplete 

 specimens indicate a length up to 150 mm., and have a width at the 

 end of the anterior fourth of 4 mm. Form moderately slender; num- 

 ber of segments about 125. 



Prostomium slightly broader than long, the length about equal to the 

 peristomium ; deeply bilobed anteriorly, the frontal tentacles prominent 

 and widely divergent below, the median sulcus deep and wide, extend- 

 ing from a point between the external paired tentacles on the dorsum 

 nelrly into the mouth ventrally and posteriorly, palpal styles very 

 short, scarcely elevated above the basal lobes from which they are 

 delimited by a shallow encirchng groove. Eyes 1 pair, large, purple, 

 on posterior margin of head, just ventrad of inner paired tentacles, 

 and in the preserved material partly concealed by the anterior border 

 of the peristomium. Tentacles all long, slender, tapering, and not, 

 or, only very faintly, articulated, the median reaching to XIII, the 

 inner lateral to XI, and the outer lateral, which are sometimes more 

 distinctly articulated than the others, to IV or V; all are very fragile 



