98 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



cardalia is much larger, measures to 150 mm long and consists of about 

 400 segments. It also has packets of needle-like spines in posterior para- 

 podia, not found in P. neocardalia. The modified spines of the fifth 

 segment are straight and not falcate. 



P. neocardalia has the same general distribution as Boccardia basilaria; 

 the two have usually been taken in the same samples, between Santa 

 Barbara and the San Pedro area from shelf depths. 



Polydora limicola Annenkova, 1934 



Polydora ciliata limicola Annenkova, 1934, p. 325, fig. 5. 

 Hartman, 1959, p. 385. 



Collections. Playa del Rey, near Los Angeles, in intertidal zones, 

 at bases of Mytilus edulis colonies (many) ; Los Angeles harbor, fouling 

 on bottoms of ships (many). 



In southern California this species attains a length of 18 to 25 mm, 

 width about 1 mm, and segments number 80 to 90. Most individuals 

 occupy mucoid, mud-covered tubes, massed to form clusters, and ex- 

 ternally covered with fine gray silt ; these clusters resemble those of 

 Polydora ligni Webster, sometimes found in the same habitat. 



The prostomium is prolonged forward as a snout and is vaguely to 

 distinctly incised at its middle frontal margin. The 4 eyes are in trape- 

 zoidal arrangement, or may be obscure to nearly absent. A nuchal ridge 

 extends back between the palpal bases and continues to the end of the 

 second to fourth setigerous segment ; there is no median antenna. Palpi 

 are long, taper distally and tend to remain attached through preserva- 

 tion. 



The first setigerous segment has neuropodial fascicles only; the setae 

 are few and inconspicuous. From the second segment parapodia are 

 biramous, with setae well developed in each fascicle. The fifth or 

 modified segment is nearly twice as long as those adjacent; it is pro- 

 vided with modified spines, numbering 8 to 15, arranged in a wide 

 open crescent, in a single row, and they are accompanied by slenderer, 

 distally pointed setae. The falcigerous spines have a small, triangular 

 subterminal tooth on one side, best seen when the seta is viewed 

 from its greatest width. When the falciger is slowly rolled it is seen that 

 the tooth is attached to the spine only at its base, and the distal part 

 is finger-like. This condition contrasts with that in Polydora websteri 

 (see below) in which the accessory process is shelflike, not toothlike. 



