156 THE ANNELIDA POLYCHAETA. 



While their bases are well separated, the expanded styles of neurocirrus and 

 notocirrus on each side of each somite often nearly or quite meet. The para- 

 podia proper are low, scarcely convexly elevated. Each bears two setae as 

 usual, these being simple, slightly curved, and acutely pointed. 



The somites are all simple, entire, not separated by deep furrows, and smooth. 

 The pygidium is short and blunt. No anal cirri are in situ in the type. 



Localities. Between the Galapagos and Paumotu Islands: Sta. 4722 

 (lat. 9° 31' S., long. 106° 30' W.). 300 fms. to surface. Surface temp. 75° F. 

 16 January, 1905. Two specimens. 



Between the Galapagos and Paumotu Islands: Sta. 4724 (lat. IT 13' 30" 

 S., long. 109° 29' W.). 300 fms. to surface. Surface temp. 77° F. 17 January, 

 1905. One specimen. 



Toward the Paumotus: Sta. 4740 (lat. 9° 02' S., long. 123° 20' W.). Surface 

 temp. 81° F. 11 February, 1905. One specimen. 



Plotobia coniceps, sp. nov.'^ 

 Plate 66, fig. 2-4. 



The body is typically but faintly tinged with brown, probably due to preser- 

 vation, and is translucent and probably transparent in life. Two paratypes, 

 however, are a much darker brown and somewhat dusky, with a paler mid- 

 dorsal line. 



The type is 32 mm. long with a maximum width of 3.25 mm. The small- 

 est specimen is 14 mm. long. The specimen from Sta. 4711 is but 10 mm. long 

 and is slender and translucent. The number of somites is twenty-one or twenty- 

 two inclusive of the peristomium. The body is somewhat fusiform, narrowing 

 from the middle conspicuously and about equally toward both ends. 



The prostomium is strictly conical in form with its axis extending cephalo- 

 dorsad in the type but more longitudinally in the large para type from Sta. 4661. 

 It is denser and darker than the rest of the body. Its apex is slightly bluntly 

 rounded and bears the abruptly much more slender, very gradually acuminate, 

 colorless tentacle. The tentacle is very short, equalling or a little exceeding the 

 radius of a section of the prostomium the length of the tentacle from apex. 

 The cirri are lost, but the scars at the base of the head are prominent. The lower 

 lip is prominent, smooth, with its anterior edge convex. The retort organ in 



' Ko^fiKos, conical, -ce})s, head. 



