262 PROCEEDINGS OF THE ACADEMY OF [April, 



bifurcate setse of peculiar form (fig. 33). They have the slender stem 

 with half-round collar flanges which appear in profile as marginal 

 serrations ; the end of each prong is expanded and slightly bilobed and 

 provided along the inner side with long oblique hairs. Anterior neuro- 

 podials form dense palisades of four to six series of chiefly short, blunt, 

 somewhat clavate, yellow spines, bent near the end and marked with 

 transverse serrullse at the convexity and with the tips enclosed in a 

 sheath (fig. 30). Those of the most caudal series of each palisade are 

 more slender and bear a slender, tapered, smooth tip ; and at the ven- 

 tral border of each is a small tuft of setse like the notopodials but 

 smaller. Neuropodial fascicles of the posterior region are small, com- 

 pact, erect and consist of a few very slender, straight setse (fig. 31) with 

 minute appressed teeth along one side. Setse all colorless. 



This species was taken at Moss Beach, near Monterey, Cal., on 

 July 7, 1905. It is probably the species mentioned as occurring 

 commonly on the California coast by Dr. H. P. Johnson, our leading 

 authority on the Polychseta of that region, to whom it is a pleasure 

 to dedicate it. The type is a female filled with large eggs. 



Naineris robusta sp. nov. (Plate VIII, figs. 34-37). 



Form generally similar to N. longa but decidedly stouter, tapered 

 both ways from the middle, the anterior end more depressed and 

 broadly rounded into the prostomium, the posterior region subterete, 

 strongly convex below, flattened above. The largest specimen is 

 170 mm. long and has a maximum diameter in the middle of the body 

 of 4 mm. ; from 26 to 30 segments constitute the anterior region and 

 as many as 360 the posterior region. 



Prostomium broad, flat, somewhat shovel-shaped, broadly rounded 

 and with a thin margin anteriorly; posteriorly somewhat narrower 

 and retracted within the peristomium; ventrally it is continued by 

 a somewhat swollen rugous area to the mouth and is united to the 

 anterior peristomial ring. No eyes; deep lateral recesses at the pro- 

 peristomial furrow represent the nuchal organs. 



Peristomium a somewhat indistinct naked ring about equaling II, 

 simple above, below split into two rings between the rugous folds 

 of which the mouth lies. 



Segments of anterior region about eight times as wide as long, con- 

 vex below, slightly concave above and about half as deep as wide. 

 Passing into the posterior region the segments become shorter (about 

 12 times as wide as long), much deeper, very convex below and nearly 

 flat above. No sharp boundary exists between the two regions, but 

 estimated, by the segment upon which conspicuous neuropodial setse 

 cease twenty-eight may be counted in the anterior region. 



