176 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.10 



the cutting edge, but more posteriorly some are toothed (pi. 13, fig. 288). 

 Farther back the postsetal lobe continues long, similar to that in anterior 

 parapodia, and the aciculum projects in like manner (pi. 13, fig. 289). 



A^. calif orniensis may be characterized as follows : the prostomium is 

 long, pointed, provided with 4 eyespots; mandibles are fairly large, long- 

 er than wide; maxillae are strongly dentate, with long, slender carriers 

 and a greatly reduced unpaired piece; parapodia are tiny but have an 

 elongate postsetal lobe throughout, acicula are deep yellow, setae are 

 broadly bilimbate. 



Arabella attenuata Treadwell (1906, pp. 1172) from Monterey Bay, 

 California, might be considered in comparison, since it too has heavy 

 projecting acicula. It was characterized as follows: with 4 eyespots on 

 the prostomium, maxillae dentate, stout acicula project from parapodia. 

 In these respects it approaches more nearly to Notocirrus than to Ara- 

 bella. It has a much shorter prostomium than N. calif orniensis, since the 

 width was shown to be nearly equal to the length, and the eyespots were 

 shown to be arranged in a straight line. The maxillae were described as 

 follows: "Right maxillae with 4-toothed plates, increasing in size from 

 before backward [in retracted proboscis?] ; first with 4 equal teeth, sec- 

 ond with 5 teeth, increasing in size from before backward ; third with 4 

 or 5 much larger teeth than occur on either of the others ; fifth with 6 or 

 8 prominent teeth. The left maxillary plates were too badly broken to be 

 described. A long, narrow, light brown chitinous rod terminates the 

 maxillae posteriorly." The meaning is not quite clear. It is not certain 

 whether the "4-toothed plates" means that there are 4 plates with teeth 

 (since a fifth plate is designated farther on) or whether there are plates 

 with 4 teeth, since some have more teeth. Also, there is some doubt if the 

 designated first maxilla should be what is normally called maxilla I or 

 maxilla V (or even IV). If the first is actually maxilla IV (or V), the 

 formula on the right side would be maxilla V with 4 teeth, IV with 5 

 teeth. III with 4 or 5 teeth, maxilla II not given, maxilla I with 6 or 8 

 teeth. Also, the carriers are described as "a long, narrow, light brown 

 chitinous rod," a structure difficult to correlate with characters in this 

 family. Because of these differences, A^. calif orniensis is considered to be 

 distinct. It differs from other species of the genus as indicated in the key 

 above. 



Holotype. — AHF no. 53. 



Type locality. — San Nicolas Island, California, in 20-23 fms. (coll. 

 1205-40). 



Distribution. — This has been taken three times, in shallow dredging, 

 in fine black and green sand, off southern California, in depths of 8 to 

 23 fms. 



