304 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



heavily ciliated, folded over as seen in lateral view. When this stage has 

 been reached, settling occurs if a suitable substratum is provided. The 

 latest planktonic larvae observed had 15 segments. 



Boccardia uncata Berkeley 

 Plate 48, Fig. 46 



Berkeley, 1927, p. 418, pi. 1, figs. 9-13; Okuda, 1937, pp. 238-240, figs. 

 16, 17. 



This occurs abundantly in masses of oysters in Mission Bay, on the 

 south side of the bridge over which the San Diego electric railway tracks 

 pass. It is recognizable in having branchiae on the second and third setig- 

 erous segm.ents, and from the sixth posteriorly; a long, closely crowded 

 posterior portion lacks branchiae, but has heavy modified hooks (pi. 48, 

 fig. 46). 



Originally described from British Columbia, it has since been reported 

 by Okuda (1937) from Japan. This is the first record from southern 

 waters. 



PBoccardia redeki (Horst) 

 Plate 48, Figs. 44, 45 



Polydora redeki Horst, 1920, p. 111,2 figs. 



Polydora (Boccardia) redeki Okuda, 1937, pp. 240-241, fig. \2a-d. 



A single incomplete specimen was taken with numbers of Polydora 

 socialis from Mugu Lagoon, and another fragment from Mission Bay, 

 southern California. Branchiae are present on setigers 2, 3, 7 to the end 

 of the piece. The prostomium has 4 large eyespots, disposed in trapezoidal 

 arrangement. A caruncle extends posteriorly to the end of the third 

 setiger. The anterior end of the prostomium is somewhat prolonged, 

 weakly incised. The first setiger lacks dorsal setae but has a ventral 

 fascicle on either side. The stout spines of the fifth are smooth, slightly 

 falcate, their companion pennoned setae fairly large (pi. 48, fig. 44). 

 Hooded hooks are distally bifid, the hooked end oblique to the main stalk 

 (pi. 48, fig. 45). The nature of the pygidium could not be determined. 

 These specimens agree very well with the description by Okuda, but 

 differ in some details from the original description. 



P. redeki Horst was originally shown with a caruncle extending only 

 to the middle of the second setiger; in the present specimens it is continued 

 to the end of the third segment. Also, Horst shows the 4 prostomial 



