62 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



The first 3 or 4 pairs of parapodia are noticeably larger than the 

 others, their dorsal and ventral cirri together with the postsetal lobe con- 

 siderably prolonged and acutely triangular (pi. 2, fig. 38). Ventral 

 cirri of the first 4 segments are cirriform; the others are padlike. Bran- 

 chiae are present from the fourth or fifth setiger, through about the thirty- 

 seventh to forty-second, then stop abruptly, or a small papilla may be 

 present for about 2 or 3 more segments. The second to sixth branchiae 

 are the largest; the spiraled arrangement is continued throughout except 

 for the last 2 or 3 pairs which are pectinate, but have a rather long base. 

 The filaments are closely spiraled; the branchial stem is long, nearly 

 smooth. 



Subacicular bidentate hooks are first present from the twelfth to four- 

 teenth setiger, number 2 in a parapodium, as typical of the genus, and are 

 continued posteriorly to the ends of the pieces. Pectinate setae are fine, 

 with nearly straight, flaring end. Anterior parapodia have tridentate, 

 hooded hooks, number 5 to 7 in the second neuropodium, and are accom- 

 panied by 4 slender, yellow acicula with pointed tip and several fine lim- 

 bate setae. In the hooded hooks the distal fang is far the largest, the low- 

 est tooth is smallest (pi. 2, fig. 42). These hooks are continued through 

 the first 4 setigers and thereafter replaced by limbate setae. 



Median and posterior parapodia are provided with long, slender, 

 narrowly bilimbate setae with smooth cutting edge, an anterosuperior 

 fascicle of 7 or 8 fine, pectinate setae with nearly straight edge (pi. 2, fig. 

 37), 2 heavy, yellow subacicular hooks (pi. 2, fig. 43) that exceed the 

 acicula in thickness, and 3 yellow geniculate acicula, slightly heavier than 

 those in anterior segments, distally prolonged in a long, slender tip pro- 

 jecting from the parapodial lobe. 



The proboscidial armature is well developed. Mandibles are pale or 

 white, with calcareous distal ends; they are slightly longer than the 

 length of maxillary carriers and forceps. The mandibular bases are long, 

 slender, separated from one another for most of their length (pi. 2, fig. 

 40). Maxillae are characterized by their rather high dental count. The 

 carriers are broad, wider than long, basally rounded (pi. 2, fig. 39). The 

 forceps are falcate. On the left side maxillae II to IV have 10, 10, and 5 

 teeth, respectively; on the right side plate II has 11 teeth, plate III (with 

 IV fused) has 9 teeth; maxilla V on either side is a sharp, slender tooth. 



The tube is long, cylindrical, externally and internally smooth, lined 

 and covered over with a thin layer, but the outer side is annulate (pi. 2, 

 fig. 41, pi. 17, fig. 336) ; the space between the 2 layers is packed with 

 fine, smooth, gray sand, imparting that color to the tube. It terminates 

 basally in a parchmentlike membrane (pi. 17, fig. 335). 



