448 PROCEEDINGS OF THE ACADEMY OF [Juiie, 



longitudinally striated stem and bifid guarded tip, the promimal pro- 

 cess being much the larger and the guard broad, closefitting and 

 delicately striated. 



Color fairly well preserved; each segment of the anterior region 

 marked with a posterior, broader, reddish-brown band, which spreads 

 over the entire segment laterally, and an anterior whitish or pale yellow 

 one; head generally reddish, with a median anterior dark area; dark 

 pigment cells also in the cephalic appendages and branchise; other 

 appendages, ventral surface and entire posterior region unpigmented; 

 cuticle with a brilliant greenish iridescense. 



Tube delicate, mucoid, covered with fine silt. 



North of Sendai Bay, 3,771 , 62 fms. Type and numerous other speci- 

 mens. Also Sagami Bay, 3.695. 175-191 fms.; 3,698, 153 fms. 



PAKANORTHIA gen. nov. 



linermediatehetween Northia Siud Rhajnphohrachiiim. Two pairs of 

 parapodia are prolonged and carried forward on the ventral side of 

 the head as in Rhamphobrachium, but their setae are coarse acicula 

 as in Northia, not capillary as in Rhamphohrachium. 

 Paranorthia brevicornuta sp. nov. (PI. XX V. figs. 52-56.) 



A small species represented by an incomplete specimen of 62 somites, 

 having a length of 22 mm. and a maximum width between the tips of 

 parapodia of 1.25 mm. 



Prostomium, as seen from above in the slightly bent up attitude of 

 the specimen, nearly circular, but slightly and broadly emarginate 

 iDehind, frontal surface smooth, regularly rounded. Eyes absent. Ten- 

 tacles all in anterior half of prostomium, the paired in advance of the 

 median, and the outer lateral well down on sides below level of frontal 

 tentacles ; basal pieces of median tentacles shorter than those of lateral, 

 which are as long as h width of head ; terminal pieces of median and 

 inner lateral subequal, subulate, their length about U width of head; 

 outer lateral shorter, ecpialling width of head, stouter and Ijlunt. 

 Frontal tentacles globoid, their constricted bases in contact on anterior 

 margin of head. Palpi bean-shaped, length equal to style of outer 

 lateral tentacle. Peristomium distinct, about ^ length of prostomiu'm 

 on the dorsum, longer ventrally, where, as well as laterally, it is 

 crowded forward by the following somites and, Avith the prosto- 

 mium, is bent somewhat dorsad. Tentacular cirri small, awl-shaped, 

 about equalling peristomium in length. 



The first two pairs of parapodia are enlarged and l^ent forward be- 

 neath the head as in Rhamphobrachium, but they are less produced, 

 and the third pair is not similarly modified as in that'genus. Tlie first 



