72 THE ANNELIDA POLYCHAETA. 



commonly near twenty-five in number. They are also much more slender than 

 the notopodials. Each has a long slender shaft and a head or distal scale-bearing 

 division which is enlarged at the proximal end and runs out to a slender acute 

 tip like the head of a spear; in one view the seta is a little curved proximad of 

 the head; along one side of the head (the side of the convexity of the seta) are 

 two rows of scales and distad of these there is a distinct subapical tooth. (Plate 8, 

 fig. 6, 7). In the more anterior setae the heads are much shorter than in the 

 posterior ones. (Plate 8, fig. 5). In addition there is a third type of notopodial 

 setae; these are longer and stouter than the others and are straight; they are 

 acuminate distad in the usual way; in place of a single series of pectinae there 

 are five or six ranks of these. (Plate 8, fig. 5). 



None of this third type was found cephalad of the eighth (seventh meta- 

 stomial) segment, in the fascia of which two were noted, but they occur on the 

 segments caudad of this and project conspicuously beyond the others. 



Locality. Between Galapagos and Paumotu Archipelagos: Sta. 4728 

 (lat. 13° 37' 40" S., long. 114° 22' W.). 19 January, 1905. One specimen taken 

 at 300 fms. to surface. 



This species is well characterized by its remarkably reduced lateral tentacles, 

 the character of the elytra and their papillae, and the structure of the setae. 



POLYNOE NESIOTES, Sp. UOV. 



Plate 8, fig. 8; Plate 9, fig. 1-5. 



The body is short and compact, exclusive of the parapodia having its 

 greatest width at about the ninth somite, from where it narrows very slightly 

 cephalad and gradually caudad; inclusive of parapodia the greatest width is a 

 httle farther caudad; the dorsal surface appearing flat with the parapodia 

 rising obliquely at the sides; the ventral surface is smooth, a wide neural ridge 

 present. The total length at present is about 22 mm.; the greatest width, 

 exclusive of the parapodia, 3 mm. ; inclusive of the parapodia but without setae, 

 4.6 nmi.; over all, 5.6 nrni. Number of somites thirty-four. 



The color of the body at present is dark brown, but as the specimen appears 

 at some time to have been dry this is scarcely of significance. The neuropodial 

 setae are pale yellow; the notopodials colorless or white. 



The prostomium is so shrunken in the type that its original form cannot be 

 stated. The ceratophores of the tentacles are cylindrical and parallel, the 

 median a little exceeding the lateral. The tentacles are comparatively thick; 



