202 University of California Puhlications in Zoology [Vol. 13 



portion, which is deeply grooved on its dorsal surface and extends to 

 the eighteenth setigerous somite. The anterior end of the "caruncle" 

 is provided with a median papilla. The pharynx was partly pro- 

 truded and showed a much pigmented inner surface. Eyes were not 

 observed. 



The peristomium is fused ventrally with the first setigerous somite 

 so that the latter seems to be situated on top of the former. The 

 ventral surface of the peristomium has numerous longitudinal grooves 

 which converge toward the margin of the mouth. The lateral and 

 dorsal lips are very rugose, possibly due to the partial protrusion of 

 the pharynx. 



The first setigerous somite is fused ventrally with the peristomium, 

 while dorsally its posterior margin is even with the posterior edge of 

 the tentacle. The neuropodium is a low papilla, having a postsetal 

 lobe extending to the end of the setae. The notopodium, a rounded 

 papilla, is much shorter than the neuropodium, and has small post- 

 setal lobes and few setae. 



The second setigerous somite is not entirely distinct from the 

 peristomium on its ventral surface, but is more distinct laterally. 

 The neuropodium is larger than that of the first somite but otherwise 

 resembles it. The notopodium has a rounded presetal lobe and a flat, 

 curved gill, which extends dorsally about as far as the middle of the 

 tentacle. The anterior edge of the gill is smooth, while its posterior 

 edge is convex and frilled. 



The later parapodia increase in prominence and the postsetal lobes 

 of both neuropodium and notopodium become thick vertical plates 

 separated from one another only by a very narrow space (pi. 12, fig. 

 22). The body gradually alters its shape until, at the twenty-fifth 

 somite, it assumes a rectangular form, its lateral surfaces being com- 

 posed of the vertically arranged parapodia. The width of this rect- 

 angle is about twice its height. The gills in each parapodium are con- 

 tinuations of the postsetal notopodial plate. They become more nearly 

 cylindrical toward the middle of the body, and lie close to the dorsal 

 surface with their long axes at right angles to that of the body, leaving 

 an imcovered area about equal to half of the diameter of the body. 



The posterior end of only one specimen was found, and it lacked the 

 pygidium. On this fragment the gills disappear quite abruptly at a 

 considerable distance from the end, and the neuropodial and noto- 

 podial lobes are very small. The setae are arranged in a single vertical 

 row in each lobe of the parapodium, the most dorsally placed noto- 



