254 bulletin: museum of comparative zoology. 



Length to caudal end of twelfth elytra 23 mm.; width to tips of 

 setae, 9.5 mm. ; to outer edges of elytra, 7.8 mm. ; to bases of parapodia 

 ventrally, 3.6 mm. 



Locality. — Calif.: San Francisco (A. Agassiz). 



Type.— M. C. Z. 179. 



6. Harmothoe imbricata (Linne). 



Aphrodita imbricata Linn6, Syst. nat., ed. 12, 1767, 1, p. 1084. 



One specimen from San Francisco (T. G. Cary) and one from 

 Crescent City (A. Agassiz). This is a common species on the Pacific 

 Coast from Alaska to San Diego. 



Aphroditidae. 

 7. Aphrodita armifera Moore. 



Proc. Acad. nat. sci. Philad., 1910, p. 371, pi. 31, fig. 65, 66, pi. 32, fig. 67-75- 



Two specimens of this strongly characterized species were dredged 

 in 22 fathoms of water five miles south of Santa Barbara. 



8. Aphrodita leioseta, sp. nov. 



This form i.s close to A. castanea Moore, from which it is separated chiefly 

 because of differences in the setae. The upper neurosetae are black, the 

 median ones black or dark brown and the ventrals brown of a usually lighter 

 shade. The neurosetae of the ventral series are from two to five in number, 

 three and four being most common in the middle region of body, as against 

 from si.x to eight in castanea. Three in the middle series and two in the upper 

 as usual. The neurosetae differ from those of castanea in being all wholly 

 smooth, with no trace of hairiness at tips, and in being distally more strongly 

 curved, the curvature weakly sigmoidal, with tip less acute, that of the dorsals 

 in particular narrowly rounded. The notosetae are proximally dark or 

 reddish brown but in middle region of length become light and distally color- 

 less. They have the long, soft, slender distal ends characteristic of the 

 japonica group though these do not seem to be normally at all hooked. As a 

 whole they are strongly curved and are largely concealed by the felt, the distal 

 portion in all cases normally buried in this. The prostomium is long, some- 

 what inversely pyriform, being much narrowed proximad; evenly rounded 



