380 PROCEEDINGS OF THE ACADEMY OF [April 



smaller ventral setae nearly the entire toothed portion consists of a 

 spiral of four to five and one-half turns. On I all setae are smooth 

 fiber-like capillaries. Toward the caudal end, the neuropodial spines 

 become more and more slender and acquire rather conspicuous spur- 

 like teeth, at first few and irregularly arranged and finally in two 

 regular series, extending for a long distance on the very slender and 

 much elongated setse (figs. 83 and 84). Notopodial spines become 

 more slender and lateral fibers coarser and in brush-like tufts. 



No natural color exists on the body but some parts are stained with 

 a yellowish incrustation. Numerous external parasites are attached 

 to the integuments of both dorsal and ventral surfaces. 



Stations 4,457, Monterey Bay, off Point Pinos Light, 40-46 fathoms, 

 dark green mud (2 cotypes); 4,464, same region, 36-51 fathoms, 

 soft gray mud (type). 



Aphrodita castanea sp. nov. PI. XXXII, figs. 85-97; PI. XXXIII, fig. 98. 



A species of the A. japonica group; narrowly ovate, tapered toward 

 both ends but the posterior much more slender and attenuated, strongly 

 depressed with a nearly flat dorsum and flat, sole-like venter; espe- 

 cially remarkable for the serried rows of numerous rich chestnut- 

 colored notopodial setae which cover the sides nearly completely. 

 The type is 48 mm. long; maximum width of body (at XIV) 14.5 

 mm., between ends of parapodia 22 mm., between tips of setae 31.5 

 mm. ; depth 10.5 mm. number of segments 4:!. 



Prostomium (Pi. XXXII, fig. 85) subglobate, nearly circular in outline 

 or slightly wider than long, slightly depressed, strongly convex above, 

 the ocular elevations prominent and hemispherical, in the position of 

 the prostomium of most of these specimens very little projecting 

 beyond the anterior margin, or even entirely dorsal so that both pairs 

 of eyes are visible from above. Eyes two pairs, minute, black, one 

 above or behind the other according to the degree of elevation of 

 the prostomium. Nuchal fold a sharply defined isthmus about one- 

 fourth as wide as the prostomium and sloping downward to the 

 transverse peristomial fold. Median tentacle arising from the frontal 

 face below the ocular peduncles, its ceratophore short, obconical and 

 about one-fourth to one-fifth the prostomial length, the style (about 

 15 examined) scarcely longer than ceratophore, strongly clavate, 

 bent into a V-shaped hook. Palpi with rather swollen bases, somewhat 

 obscurely separated as ceratophores ; styles four to six and one-half 

 times the length of the prostomium, moderately slender, regularly 

 tapered to acute tips, the cuticle smooth and polished, bearing numerous 

 delicate pointed cilia. Facial ridge very prominent, nearly as long as 



