NO. 4 HARTMAN : SPIONIDAE FROM CALIFORNIA 309 



Polydora giardi Mesnil 



Plate 48, Fig. 43 



Mesnil, 1896, pp. 195-202, pi. 13, figs. 1-12. 



Numerous collections have been made from La Jolla, California, from 

 narrow crevices in low-lying shales, occupying a niche much like that 

 of Boccardia proboscidean but in a lower zone. This is a much smaller, 

 slenderer species than that of the Boccardia, hardly exceeding 10-15 mm 

 in length, and differs in other morphological characters. Branchiae are 

 first present from the tenth setiger, and continue posteriorly through at 

 least 24 segments ; a long posterior region is abranchiate. 



The prostomium is distinctly bifid at its anterior margin ; a caruncle 

 extends back nearly to the middle of the fourth setiger. Modified spines 

 of the fifth are falcate, with an accessory, closely appressed tooth on those 

 embedded ; those exposed are simple, falcate, or with only a minute tooth. 

 A series of hooks from one side is shown in pi. 48, fig. 43. Hooded hooks 

 are distally bifid, the stalk at an oblique angle to the tip. The pygidium is 

 a thick, collarlike disk, nearly half as long as broad, only slightly flaring, 

 with dorsal and dorsolateral notches. Prostomial eyes have not been dis- 

 tinguished. 



P. giardi has remained unreported save from Europe. Because of its 

 small size and inconspicuous niche, it may have escaped detection in some 

 places. 



Polydora ligni Webster 

 Plate 48, Figs. 47-49 



Webster, 1879, p. 119. [The figures here cited were not published until 



1886, in the 39th Ann. Report.] 

 Berkeley, 1936, pp. 471-472. 

 P. amarincola Hartman, 1936, p. 49, figs. 6-10. 



Both adults and what are believed to be planktonic juveniles of this 

 species have been collected from central and southern California. The 

 following features are characteristic: (1) the prostomium is distinctly 

 bifid at its anterior margin; (2) the prostomial caruncle has a slender, 

 cirriform antenna; (3) branchiae are present from the seventh setiger 

 nearly to the posterior end; (4) the pygidial disk is broad, flaring; and 

 (5) the modified spines of the fifth setiger are falcate with a sharp 

 secondary tooth in the concave region (pi. 48, fig. 48). 



