SABELLIDES DELUS. 455 



tips. Each seta is curved or geniculate toward or distad of the middle. Each 

 is strongly fibrillate and is distinctly bilimbate from just below the bc^nd distad 

 to the base of the fine tij). (Plate 77, fig. 12). The s(!tae in each notopodium 

 are in part short and in part considerably longer, the long ones and the short 

 ones forming separate, transverse series. The uncini form a single series on 

 each torus. The proximal side of each uncinus presents the usual shoulder or 

 angle, which is moderate in size, often appears narrowly rounded rather than 

 acute, and is a little nearer one end than the other. On the pectinate side there 

 appear in profile view typically five teeth, of which the one toward the smooth 

 end is more abruptly bent near its middle. The tooth adjacent to it is the 

 largest of the series. (Plate 77, fig. 11). 



Locality. Off Peru: HI miles northwest of Aguja Point. Sta. 4651 (lat. 

 5° 42' S., long. 83° W.). Depth 2,222 fms. Bottom of fine sticky grey mud. 

 Bottom temp. 35.4° F. 11 November, 1904. Three tubes, with animals in situ. 



Because of the strong resistance of the tubes to penetration of liquid, the 

 specimens are soft and poorly preserved, only the type being complete. The 

 longest of the tubes measures 300 mm. in length, with a diameter of 5.5 mm. 

 They are composed of very fine grey mud and are rather thin-walled. 



Sabellides Milne Edwards. 



Lamarck's Anim. s. verteb., ed. 2, 1838, 5, p. 608; Ghube, Archiv. naturg., 1850, 16, p. 80, 137; 

 Malmgren, Ofvers. K. vet. akad. Forh., 1865, 22, p. 362, 368. 



Sabellides delus, sp. nov.^ 

 Plate 77, fig. 13. 



The body in general is brownish, dusky anteriorly above. Setae of a very 

 dilute yellow, or brassy tinge, transparent. 



Body very strongly narrowed caudad, the caudal division, or abdomen, 

 short and slender; widest at about the seventh somite where the width in type 

 is 3.2 mm. Length of type, 16 mm. Longest branchia near 7.8 mm. long. 

 The dorsum strongly convex, the venter flattened, that of the abdomen having 

 a longitudinal median furrow. The usual fourteen somites bearing capillary 

 setae. Uncini beginning on the third setigerous somite. 



Prostomium strongly convexly rounded above. On each side a longi- 



* dr/Xos clear, distinct. 



