200 University of California Fublications in Zoology . [Vol. 13 



peristomium is relatively long and has a median dorsal elevation 

 which appears like a posterior continuation of the prostomiiim, and 

 is then itself continued into the base of a conical elevation on the 

 dorsal surface of the first setigerous somite, the general effect being 

 that of a median caruncle extending from the apex of the pro- 

 stomium to the posterior border of the first setigerous somite (pi. 11. 

 fig. 14). On either side an elevated ridge starts from the anterior 

 face of the peristomium and extends, as a low wing, to the posterior 

 edge of the somite. The tentacles are about four times longer than 

 the head and arise from the posterior end of a depression bounded 

 by the "wing" and the "caruncle." Each tentacle tapers regularly 

 to its apex, with a faint groove on its dorsal surface. There are 

 four small black eyes, the posterior ones being nearer together and 

 a little larger than the anterior ones. 



The first setigerous somite has a distinct neuropodium and noto- 

 podium, the setigerous lobe of the latter being more prominent than 

 that of the former. Each has a prominent postsetal lobe, that of the 

 notopodium being the larger (pi. 11, fig. 15). 



On the second setigerous somite the neuropodial lobe is much 

 longer and has, on one side, a broad wing which forms the gill. On 

 the fifth and sixth somites the neuropodial lobes nearly meet on the 

 mid-dorsal line. Farther back they retain this size though, with in- 

 creasing width of body, more of the dorsal surface is left uncovered 

 in the mid-line. 



When fully developed the parapodium (pi. 11, fig. 16 of the 13th) 

 shows prominent postsetal lobes, but the setae themselves arise directly 

 from the body wall, without any definite setal lobe. The postsetal 

 neuropodial lobe is rounded but not very prominent. The postsetal 

 lobe of the notopodium is drawn out to form a prominent gill com- 

 posed of a cirrus-shaped ciliated dorsal portion, which contains a 

 blood-vessel in the form of a single loop, and a shorter, flattened 

 ventral portion. 



Behind the twenty-fifth somite the neuropodium and notopodium 

 are widely separated so that the former is distinctly ventral and the 

 latter distinctly dorsal. Between them the body-wall is much swollen 

 (glandular?). A low vertical ridge unites the two parts of the 

 parapodium. The gill has a dorsal keel as in the anterior somites, 

 but it is smaller (pi. 11, fig. 18). 



The setae of the first setigerous somite are relatively very long 

 and longitudinally striated. Each gently tapers to its apex and has 



