154 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



9, fig. 206). At about parapodia 38, the inferior limbate setae disappear 

 and thereafter the dorsalmost limbate setae are gradually replaced by 

 hooded hooks. From about segment 50 only one limbate seta may be pres- 

 ent, or 3-4 may continue through a long region nearly to the posterior 

 end (pi. 9, fig. 199). Acicula usually number 4 in anterior parapodia and 

 3 in median and posterior parapodia. 



The proboscidial armature consists of well-developed maxillae and 

 mandibles. The carriers are short (pi. 9, fig. 197, for an individual from 

 coll. 1195-40) or longer (pi. 9, fig. 198, for one from coll. 1137-40 J. 

 Forceps are long, falcate; maxillae II have a broad, long, basal portion, 

 and 5 teeth on each cutting edge; maxillae III and IV each have one 

 tooth (pi. 9, figs. 197, 198). Mandibles are long, slender, with wide, 

 flaring distal ends and long, slender basal ends for a longer (pi. 9, fig. 

 200) or shorter (pi. 9, fig. 196) distance. In 2 collections (1130-40 and 

 1137-40) maxilla II has 5 teeth left and only 4 right; in another (coll. 

 1264-41) it has 6 teeth left and 5 right; in still another (coll. 1142-40) 

 maxilla II has only 4 teeth on each side. This is believed to fall within 

 the range of possible variation in this species. 



L. bifilaris Ehlers (1901, p. 139), first described from Chile, was 

 based on a single fragment only 35 mm long for 117 segments. In spite 

 of its small size, it agrees with present individuals in having yellow acicu- 

 la, strongly bilabiate parapodial lobes posteriorly, and simple, hooded 

 hooks from the first parapodium, accompanied by limbate setae. It differs 

 from our specimens most distinctly in the following: (1) it was origi- 

 nally shown with a long, tapering prostomium, whereas in these the 

 corresponding part is short, squat, triangular (pi. 9, fig. 205) ; (2) the 

 maxillary carriers were first shown with long, slender ends, whereas here 

 they are usually short, broad (pi. 9, fig. 197) ; (3) the maxillae were 

 originally shown with 4 teeth on maxilla II, 2 teeth on III and 3 teeth on 

 IV (the formula would thus be 1-1, 4-4, 2-2, 3-3), whereas in these 

 specimens the formula is usually 1-1, 5-4 (or 5), 1-1, 1-1 — in this last 

 respect (maxillary formula) they depart most widely. It may be possible 

 that these individuals will need to be relegated to a new species. 



Moore (1911, pp. 291-294) ascribed numerous specimens from south- 

 ern California to L. bifilaris Ehlers, stating, however, that there was "by 

 no means complete identity." The color of acicula was not given ; but, 

 since the description agrees in other respects with numerous individuals 

 (referred to L. bicirrata, below), especially in the proboscidial parts and 

 parapodial lobes, it would seem that the acicula were black. It appears 

 also that there is a typographical error of "peristomium" for "prosto- 

 mium" (Moore, 1911, p. 292, paragraph 3). 



