NO. 2 HARTMAN, RARNARD: BENTHIC FAUNA OF DEEP BASINS 81 



alternating filaments. The scar of attachment is seen through the dorsal 

 surface (Plate 3, figs. 1, 2). The upper or exposed surface is lightly 

 covered with hard conical spines of 2 kinds; the larger ones are distally 

 blunt, straight or slightly curved and largely limited to the posterior 

 part of the elytrum. The smaller ones are low and nodular ; they have 

 2 or 3 small peaks, and are dispersed over the antero-medial elytral 

 surface. 



Setae are translucent yellow. Notopodial setae, few in a parapodium, 

 are coarser than neuropodial setae and bluntly acicular (Plate 3, fig. 5) ; 

 they have delicate, widely spaced serrations in transverse series along 

 their free length. They are accompanied by a long aciculum emerging 

 for a considerable distance from the end of a digitate notoacicular lobe. 

 Neuropodial setae are of 2 kinds; 3 superior slender falcigers have a 

 bifid tip (Plate 3, fig. 3) with shorter accessory tooth and a slightly 

 rugose crotch (Plate 3, fig. 4). The shaft is similarly but less coarsely 

 serrated. An inferiormost small fascicle of about 8 slender setae is of 

 another kind ; these terminate distally in an entire tip and are geniculate 

 subdistally and coarsely spinous along their free length. These are 

 accompanied by a yellow, rodlike aciculum resembling the notoaciculum ; 

 it projects from the neuropodium immediately below a long digitate 

 lobe. 



Lagisca pedroensis differs from other species of the genus in having 

 2 kinds of neuropodial setae, of which the superiormost are distally 

 bifid, and the distal teeth are widely separated. Elytral spines are of 

 2 kinds. 



This species has been recovered only from San Pedro Basin, where 

 it is associated with hexactinellid sponges, other polychaetes, and mollusks 

 of the genera Limifossor, Delectopccten and Nitidella. 



Family SICJALIONIDAE 



Genus STHENELANELLA Moore, 1910 



Stehenelanella uniformis Moore, 1910 

 Moore, 1910, pp. 391-395, pi. 33, figs. 105-112. 



This common shallow water species occurs in silty and muddy bot- 

 toms where it inhabits mud-covered, mucoid tubes usually greatly ex- 

 ceeding the occupant in size; they are slimy, thickly coated with mud 



