1914] Treadivell: Polychaetous Annelids of the Pacific Coast 219 



section, its ventral surface is flattened, and its somite boundaries are 

 indistinct and marked, chiefly, by the position of the setae tufts. On 

 either side of the ninth somite there is a vertical torus-like glandular 

 swelling. Gills begin on the twelfth somite and the body changes in 

 appearance, due to the occurrence of a deep ventral and two shallow 

 lateral grooves. Its dorsal surface is more convex and is provided 

 with definitely arranged transverse markings which, in the non-pig- 

 mented forms, appear as five narrow white bands in each somite, the 

 one nearest the gill being the largest. Behind the last pair of gills 

 the lateral grooves become less prominent and the whole body enlarges. 

 In preserved material, the terminal portion of the body appears as a 

 narrow, three-ringed area invaginated into a swollen area just anterior 

 to it. On either side, this carries a bundle of long, delicate, and 

 pointed setae. The pygidium has a ventral cirrus. The base of the 

 cirrus is half as wide as the pygidium and its sides are rounded and 

 rapidly narrow, ending in a blunt-pointed finger-shaped process. On 

 either side of this process the edge of the pygidium is prolonged into 

 seven slender cirri. 



There are eighteen pairs of gills. They are apparently capable of 

 contraction, since they are relatively longer in the type than in other 

 specimens (pi. 12, fig. 38, from co-type). They are bifid and much 

 wrinkled. 



The setae of the first tuft are more prominent than those of the 

 immediately following tufts, which are, however, easily seen as far 

 back as the first gill-bearing somite. Here they are very small, and 

 are visible only under considerable magnification. They are situated 

 in two tufts at the base of the gill. The ventral setae are shorter, and 

 the dorsal ones are slightly longer, than the diameter of the gill (pi. 

 12, fig. 38). As shown in the figure they arise directly from the body- 

 wall, without any noticeable parapodia. All the setae are simple, 

 long, narrow and tapering. 



Collected from La Jolla in sand. 



Type in the Museum of the University of California; co-type in 

 the American Museum of Natural History. 



Family MALDANIDAE 

 Clymenella rubrocincta Johnson 



Clymenella rubrocincta Johnson (1901), p. 418, pi. 13, figs. 128-133. 

 Collected from Puget Sound ; Tomales Baj^ ; Pacific Grove ; San 

 Pedro ; and San Diego. Collected also in the following hauls : XLV, 



