204 University of California Publications in Zoology [Vol. 13 



beirii^' more conical and having a narrower base than that of the 

 nenropodinm. In the notopodium there is a dorsal tnft of three or 

 four long' slender setae, each of which gently tapers to an acute point 

 and has a narrow wing towards its apex. There is also a ventral tuft 

 of shorter setae, similar in form to the dorsal ones, but somewhat 

 stouter. In the neuropodium there is a double row of stout, curved, 

 and sharp-pointed setae, each having a narrow wing along its curved 

 edge (pi. 12, fig. 24). All setae show a tendency to fray along the 

 edges, possibly as a result of the pressure of the cover glass. 



The second parapodium is essentially similar, in general outline 

 and in character of setae, to the first, but is much more prominent. On 

 its dorsal surface there is a short, thick, finger-shaped gill containing 

 very prominent blood vessels. The third parapodium is similar to 

 the second in outline, but its gill is somewhat larger (pi. 12, fig. 25). 

 The relative lengths of the setae are shown in this figure, but not 

 their form. The setae are similar to those of the anterior somites, but 

 are covered with fine fuzzy processes, due either to a deposit from the 

 outside, or to their breaking up. 



The spines of the sixth setigerous somite are of two kinds; one 

 (pi. 12, fig. 26) gently curved to a blunt point; the other broadened 

 at its apex and cut across so that one edge is prolonged into a rounded 

 flat region, from the base of which numerous hair-like processes arise 

 (pi. 12, fig. 27). The base of each spine is dark brown and its apex is 

 yellow. Behind this somite the ventral setae are replaced by hooks, 

 each with a well developed hood (pi. 12, figs. 28, 29), while the dorsal 

 setae are like those of the anterior somites. 



' The specimen was taken from a tangled mass of tubes apparently 

 constructed by the Polydora. No locality was recorded. 



Type in the Museum of the University of California. 



Family CHAETOPTERIDAE 



Chaetopterus variopedatus Renier 



Tricoelia variopedatus Eenier (1804). 



Chaetopterus pergamentaceus Aud. et Milne Edwards (1834), p. 281, pi. 



8, figs. 1-4. 

 Chaetopterus variopedatus Claparede (1869), p. 78. 

 Chaetopterus variopedatus Joyeux-Laffuie (1890), p. 347. 

 Chaetopterus variopedatus Enders (1909), p. 481. 



The California specimens belong to the species commonly called 



C. pergamentaceus, but as Joyeux-Laffuie (1890) has sho^^^l, the 



