86 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



prostomium has a semicircular dark smudge just behind the insertion of 

 the frontal antennae and is also provided with a pair of large, circular 

 dark eyes and a pair of minute eyespots far forward. The peristomial 

 ring is dark dorsally. 



This species is clearly marked through the presence of large, ilat, 

 lamellar processes on anterior parapodia, presetal in position (pi. 5, figs. 

 105, 108), and by the enlarged parapodia of the first setiger, extending 

 well forward, sometimes beyond the anterior end of the prostomium 

 (pi. 5, fig. 106). The inner lateral tentacles are the longest, reaching 

 back to about the eighth setiger, the outer lateral ones reach back to about 

 the third setiger, and the median one to the fifth or sixth setiger. Their 

 ceratophores are rather short, obscurely annulated. The first parapodium 

 in one specimen (coll. 1288-41) has an abnormally bifurcated dorsal 

 cirrus on the left side (pi. 5, fig. 106). 



Ventral cirri are cirriform though clavate only on the first, or also 

 second, setiger; on the next they are thick, short, padlike, resembling 

 those farther back. Subacicular hooks (pi. 5, fig. 110) are first present 

 from the thirteenth parapodium, number 2 in a parapodium, and are 

 continued farther back. They have the distal end bidentate and are 

 characteristic for this species. 



Branchiae are first present from the tenth (coll. 1288-41), seven- 

 teenth (coll. 1253-41), or twentieth setiger (coll. A 12a-39 and A 42- 

 30). They are simple, cirriform throughout and are continued far back, 

 where they exceed the dorsal cirrus in size (pi. 5, fig. 107). 



Anterior hooded hooks are distinctly bidentate unless worn. A first 

 parapodium may have pseudoarticulate hooks with a distinctly bidentate 

 tip (pi. 5, fig. 109) (coll. 1288-41), or the distal end is bluntly bidentate 

 with no indication of an articulation (pi. 5, fig. 112) (coll. 1253-41). 

 A second parapodium may be provided with 3 such pseudoarticulate, bi- 

 dentate hooks and about 15 pectinate setae. Median parapodia have sim- 

 ple, pointed setae, 6 to 8 finer, shorter, pectinate setae (pi. 5, fig. Ill), 

 and 2 subacicular hooks. A certain amount of variation exists in the dis- 

 tribution of setal structures in anterior parapodia. In another collection 

 (1253-41) a second parapodium has a superior fascicle of about 20 pecti- 

 nate setae, 3 simple, limbate setae, and 2 obscurely articulate, bidentate 

 hooded hooks below. 



The tube is unique, consists of a greatly flattened, parchmentlike cyl- 

 inder, covered above and below with larger and smaller shell fragments 

 and flat pebbles; frontal and side views are shown in pi. 17, figs. 337, 

 338. 



