1903.] NATURAL SCIENX'ES OF PHILADELPHIA. 4-33 



Nephthys ciliata (Miiller) Rathke. 



This species was dredged in large numbers in Avatcha Bay, Kam- 

 chatka, in 12 to 15 fathoms, on a bottom of stiff green mud. A speci- 

 men from north Japan (3,775), taken in 57 fathoms from a bottom of 

 similar character, has much longer setae and larger cirri. 



EUNICID^. 

 Eunice northioidea sp. nov. (PI. XXV, figs. 36, 37, 38.) 



The type is in two pieces, probably representing the greater part of 

 the worm, and together including the head and 86 somites measuring 

 58 mm. in length and 3.5 mm. wide. The body is very Httle depressed 

 and of nearly uniform diameter throughout the region represented, 

 the dorsum very high and convex, the venter nearly flat, with a deep 

 neural groove. Owing to a rather strong forward tendency of the 

 anterior feet this end of the worm presents a shght resemblance to 

 North ia and its allies, which is heightened by the pearly-white color of 

 the greater part of the dorsum of VL 



Prostomium strongly retracted within peristomial fold, concealing 

 about one-half of its length, which is IJ times the length of the peris- 

 tomium, shape about as in E. mucronata, the frontal tentacles much 

 less divergent tjian inE. quinquifida, their terminal joint rudimentary. 

 Eyes one pair, large, brown, below base of inner and behind outer 

 lateral tentacles. Tentacles strongly and nearly regularly beaded in 

 the terminal portion, the constrictions becoming fainter toward the 

 base. In the condition presented by this specimen the median and 

 inner lateral tentacles are subequal, the former touching VIII, the 

 latter reaching into VII, and the outer laterals just touch I\. The 

 basal articulations of all are rather more distinct than in the other 

 species herein described. 



Peristomium with a wide free anterior fold above, its longest part 

 not lateral, as usual, but ventral, owing to the unusually large size and 

 prominence of the mandibular lobes. Second somite longest dorsally, 

 where it equals ^ the peristomium; its cirri long, slender, beaded, 

 reaching tip of head anteriorly, and to middle of VI posteriorly. 



Parapodia essentially as described for E. quinquifida, but more ven- 

 tral in position; dorsal cirri about as long as in that species, but more 

 distinctly articulated, the sense-organ moderately developed; pig- 

 mented spots at bases of both dorsal and ventral cirri. 



Branchiffi begin on IV as a slender process, which by VIII nearly 

 equals the dorsal cirrus on one side, while on the other it is bifid and 

 nearly as long; they are trifid on both sides on XI, quadrifid on XV 

 28 



