306 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 15 



most apparent because of the difference in neuropodia. Branchiae are 

 simple and lanceolate and first present from about the eighth segment ; 

 they are continued back to or near the posterior end and widely sepa- 

 rated from each other across the middorsum. Neuropodial setae of the 

 first three segments differ from those farther back in having coarser 

 shafts and brushy tips (pi. 42, fig. 2) ; all other thoracic setae are 

 slender and distally pointed. Furcate setae are present in abdominal 

 notopodia. Postsetal lobes of both notopodia and neuropodia are simple, 

 longer to shorter slender lobes. Parapodia are lateral to dorsolateral in 

 posterior segments. There are no interramal or ventral cirri, no sub- 

 podial or ventral fringe and no uncinate hooks or spines. 



Califia differs from other orbiniids in having the first three seti- 

 gerous segments modified and provided with special setae and parapodia 

 directed laterally to dorsolaterally. A single species, C. calida, new 

 species, is known. 



Califia calida, new species 

 Plate 42, figs. 1-3 



Orbiniid n.g. and sp. Hartman, 1955, p. 179. 



Collections.— 1995-50 (1); 2219-53 (1); 2230-53 (1); 2301-53 

 (1) ; 2324-53 (1-) ; 2343-53 (1) ; 2410-53 (2) ; 2411-53 (2) ; 2412-53 

 (1) ; 2428-53 (2) ; 2441-53 (2) ; 2628-54 (1) ; 2635-54 (1) ; 2723-54 

 (3) ; 2798-54 (2), all stations in San Pedro Basin, California, in 235 

 to 418 fathoms in green mud, especially associated with siliceous sponge. 



All individuals are fragmented; total length is 80 to 100 mm with 

 the greatest width, between segments 7 to 10, about 6.5 mm. The body 

 tapers slightly farther back and more rapidly to the small prostomium. 

 Abdominal fragments are readily identified in mixed collections by the 

 presence of a conspicuous black mid-dorsal spot in the form of an anvil, 

 located on a segmental depression between successive welt-like ridges 

 continuous with the inner branchial bases. The greatly prolonged slender 

 notopodial postsetal lobes and neuropodial bases of posterior segments 

 are also very characteristic. 



The prostomium is a short, equitriangular inconspicuous lobe with- 

 out eyes. Nuchal organs are visible at the posterolateral margins and 

 their depressions extend back on the peristomium. In some individuals a 

 large, multibranched, epithelial proboscis is everted and conceals the 

 ventral side of the first segment. The peristomium or first ring is about 

 as long as the prostomium and two and one-half times as broad at its 

 posterior end. The body widens rapidly in the first few segments, so 

 that this region appears inflated. 



