440 PROCEEDINGS OF THE ACADEMY OF [June, 



plane; besides the anterior angle a single obscure tooth aljont the mid- 

 dle of the antero-medial side. IMaxillae of the usual form, the carrier 

 minute, the 2 halves together scarcely exceeding in width the base of 

 the maxillae proper, and their length only I that of the latter. Posterior 

 lateral plate triangular with unusually long median side bearing about 

 10 conspicuous sharp teeth. Two anterior right, 3 left jaws; the 1st 

 with a single tooth, the 2d with 11 right and 8 left, the 3d left with 8 

 teeth occupying its entire margin. 



A'ery common in Sagami Bay, 3,698, 153 fms 

 Eunice gracilis sp. nov. (PI. XXV, figs. 46, 47, 48.) 



A rather slender-bodied s])ecies with jjarapodia of greater length than 

 usual. The type consists of 110 somites, is 49 mm. long and 4 mm. 

 wide to the tips of the feet. 



Prostomium about equal in length to peristomium, into which it is 

 less retracted than usual, anterior sulcus not quite reaching to median 

 tentacle on dorsal surface, but passing into mouth ventrall3^ Frontal 

 tentacle prominent, divergent, terminal pieces rather larger than usual. 

 Tentacles articulated, the constrictions becoming fainter toward the 

 base; median reaches to VIII. inner laterals to \T, outer laterals 

 imperfect. Eyes wholly exposed, large, piu'plish-brown, in the usual 

 position. 



Peristomium rather short, longest laterally where it about equals 

 prostomimn, mandibular lobe not Ijidentate, short, oral margin very 

 faintly furrowed and crenulate, dorsal free fold or collar short, barel}" 

 reaching the median tentacle, and leaving eyes fully exposed. Second 

 somite rather obscurely separated from prostomium, of which it is 

 about ^ the length. Dorsal cirri articulated, reaching to centre of 

 eyes anteriorly and J into somite \, posteriorly. 



Somite V, the largest in the prebranchial region, is about U- times II. 

 In the branchial region all somites are shorter than in the pre- or post- 

 branchial regions. Body very little depressed, and ventral surface 

 unusually convex, with a very faint neural groove. Anus subdorsal, 

 wdth two very long more dorsal and posterior cirri equalling the 17 

 posterior somites, and two short more ventral and anterior ones be- 

 tween \ and ^ the length of the others. 



Parapodia of the usual form and modifications, but rather longer 

 than usual, and, owing to the ventral convexity of the body, placed 

 relatively higher on the sides. The branchiae resemble those of E. 

 mucronata in that the branches are erect upon a stem curving parallel 

 to the body walls, but differ strikingh' in that the termination of the 

 stem, instead of bending dorsad parallel to the other filaments, as in 



