NO. 2 HARTMAN, BARNARD: BENTHIC FAUNA OF DEEP BASINS 129 



Genus PHERUSA Oken, 1807 



Pherusa sp. 



Small or fragmented specimens, presumably vegetative stages, come 

 from San Pedro and Santa Catalina Basins. The surface epithelium is 

 lightly papillated and the long setae of the first few segments form a 

 cephalic cage. They may be representatives of one or more of the several 

 species known to occur in shallower ocean bottoms off southern Cali- 

 fornia. 



Genus BRAD A Stimpson, 1854 



Brada glabra, new species 

 (Plate 14, figs. 1, 2) 



The type specimen is from San Nicolas Basin (Sta. 6341 ) and others 

 are from San Nicolas and Santa Catalina Basins and from Patton escarp- 

 ment. More numerous individuals were taken in shallower sea bottoms 

 of southern California (unpublished records). 



Specimens are sometimes recovered from dead Cadulus (scaphopod) 

 shells in which they lie in a nearly straight position, surrounded by silt. 

 The body is slightly depressed cylindrical, widest at the anterior three- 

 fifths and abruptly narrower in the posterior two-fifths. It tapers grad- 

 ually posteriorly but both anterior and posterior ends are bluntly rounded, 

 with the anterior end turned ventrally and the posterior directed dor- 

 sally. There is no cephalic cage. The type measures 6 mm long by 0.6 

 mm wide and consists of 33 setigerous segments. Some measure to 8 mm 

 long and are somewhat larger, but most are smaller. Segmental lines are 

 visible externally but there are no constrictions and there is no separation 

 into body regions. The surface epithelium is smooth, without any papillae, 

 and the parapodial ridges are visible only as papillae from which the setal 

 fascicles project. The midventrum is marked by a longitudinal shallow 

 groove which indicates the location -of the neural cord. 



The prostomium is a small rounded lobe without eyes or visible ap- 

 pendages. It is followed by the first setigerous segment, which is narrower 

 and has shorter setae than those following. All parapodia are biramous, 

 with the rami widely separated from each other. A small subspherical 

 interramal papilla is located near the dorsal ramus and present in all 

 parapodial segments. 



Anterior setae are mainly slenderer, distally pointed, numbering 2 

 or 3 in a ramus. The dorsal and ventral ones resemble one another. In 



