342 THE ANNELIDA POLYCHAETA. 



The distal portion of the edge of the shaft on the side of the acute distal angle 

 is finely dentate. The distal piece in the compound setae is moderately long, 

 more slender than the shaft, and of uniform diameter until the hooded distal 

 region is reached, where it narrows as usual ; there are two teeth, the distal one 

 much the larger and strongly cui^ved, the subapical one small, acute, and pro- 

 jecting at right angles to the general axis; the guards distally rounded, not rising 

 above the level of the distal tooth. (Plate 63, fig. 1). 



The mandibles are large and sohdly black throughout. The two pieces 

 are narrowly connected at the level of the proximal ends of the masticatory plates. 

 Each masticatory branch diverges widely from the other one; they enlarge ectad, 

 with the distal margin curving convexly and extending almost directly ectad at the 

 distal portion; the margin is smooth over its proximal portion, toward the middle 

 becoming wavy, and over the distal portion strongly dentate; the most distal 

 teeth are long, curving a Uttle mesad. The shafts are widely separated. Each 

 is of nearly uniform diameter caudad to a little behind its middle, where they 

 expand a little, and then narrow to the acutely pointed caudal end; each shaft is 

 bowed moderately ectad, the caudal ends of the two bending in towards each 

 other. (Plate 62, fig. 6). The numerous small maxiUae form two long articu- 

 lating series on each side, the two series being in contact anteriorly and caudally. 

 Each maxilla bears a single long, simple, curved hook. The maxillae and hooks 

 are longest in the middle region of the series, those of each series decreasing 

 gradually toward the ends. At the proximal end each inner series is continued 

 by a smooth, unsegmented, tendon-Uke, chitinous piece, which is slenderly 

 acute at its proximal end. Each outer series is proximally continued in a similar 

 way by a wider, smooth, chitinous piece which expands caudad, bends more 

 or less into a vertical position, and unites with the one of the opposite series to 

 form a V-shaped piece. 



Locality. Marshall Islands. Came up on the anchor from a depth of 

 12 fms. 1899-1900 Exped. One specimen. 



This species is in the group having a distinct terminal piece to the palpi. 

 In the numerous articles in the tentacles it resembles the New Zealand species, 

 D. incerta (Schmarda) (D. australis Haswell). From that species, however, it 

 differs in numerous details. Unlike incerta, its notocirri do not have terminal 

 articles. The preocular area of the prostomium is shorter than in that species 

 and the anterior eyes, a very striking feature of the species, are much larger, 

 The notocirri are longer. An important difference is in the presence of the 

 conspicuous lobes at the end of the parapodia, these being absent in incerta or 



