264 PROCEEDINGS OF THE ACADEMY OF [April, 



finely denticulated along one margin. There is also a small ventral 

 group, arranged in a few obliquely longitudinal rows, of slender 

 capillary setae denticulated and camerated like the notopodials. An- 

 teriorly these capillary setae increase in number, the tips of the stouter 

 setae lengthen and the rows become shorter, although remaining five. 

 Posteriorly the length of the rows again decreases and at about XXX 

 their number is abruptly reduced from five to three and the stout setae 

 quickly disappear, leaving only the ventral capillary setae. These 

 are colorless and exactly like the notopodials of the same region, except 

 that they are somewhat shorter and the fascicles more spreading. 

 They undergo little change throughout the posterior region, but on 

 middle and posterior segments six or eight small blunt spines appear 

 among their bases and probably represent the projecting ends of 

 acicula. Except that the tufts are larger and more spreading in the 

 anterior and more erect in the posterior region the capillary notopodial 

 setae do not differ. They are colorless, slender with much attenuated 

 tips, slightly curved and the distal half asymmetrically camerated 

 and finely denticulated along the convexity (fig. 36). A very small 

 number of bifurcate setae (fig. 37) are associated with the capillary 

 setae in the ventral part of the bundle, but they are- difficult to see and 

 appear to be absent from the anterior and many segments of the 

 posterior region. 



The protruded proboscis has the form of a rosette with ruffled 

 margins, the deepest folds dividing it into four lobes, each of which is 

 again subdivided into two, three or four much folded lobules. 



Color pale brown with neural and infrapodal series of spots, or 

 more extensively pigmented with dark brown. 



The type and two other examples, the former being an egg-bearing 

 female, were taken between tides at San Diego, and a single specimen 

 at Monterey Bay on June 20, 1905. 

 Naineris longa sp. nov. (Plate VIII, figs. 38-42). 



Form moderately slender; the anterior region slightly wider and 

 obscurely separated from the posterior by a slight constriction, rather 

 strongly depressed, flattened above; posterior region gently tapered 

 caudad, strongly convex below, flat above. Length up to 140 mm., 

 of which the anterior region is 16 mm. ; width and depth at caudal 

 end of anterior region respectively 3 mm. and 2.5 mm. Number of 

 segments of full-grown worms 290 to 310, of which 22 to 26 belong to 

 the anterior region. 



Prostomium broad, flat, about twice as wide as long; anterior border 

 gently convex and slightly upturned; ventral surface extended some- 



