1914] Treadivell: Polychaetous Annelids of the Pacific Coast 209 



The prostomium is prominent and its sides are folded almost at 

 right angles to its dorsal portion so that, together with the lower lip, 

 they enclose a rectangular area. The lower lip is fleshy and rather 

 prominent. The tentacular ridge is moderately developed, with a 

 dense row of minute dark spots extending to the ends of the lower 

 lip. The tentacles are more than one-third longer than the body and 

 the width of each, at its base, is about one-eighth that of the body; 

 they narrow very little toward their ends. The specimen had six 

 tentacles in a row on the right and five on the left. The two most 

 ventral ones of the left row were very small, and were possibly re- 

 generating. There are three pairs of cirriform gills. The anterior 

 pair have five cirri on either side, extending to the base of the tentacles. 

 The middle pair have four cirri on either side, and are slightly more 

 than half as long as the anterior pair. The posterior pair are nearly 

 as long as the middle pair and have three cirri on the left and one on 

 the right. It is not probable that these numbers are constant. 



Setae begin on an elevated ridge on the second somite and extend 

 for eighteen somites. The body, behind this point, was much smaller 

 than anteriorly and no setae were seen on it. It was possibly regen- 

 erating. The setae (pi. 12, fig. 30) are short with lance-shaped ends, 

 and are arranged in a dense bundle. The uncinus is provided with a 

 large terminal hook, and the crest is composed of two larger lateral 

 and three smaller median teeth (pi. 12, fig. 31). 



Locality ( ? ) . Type in the Museum of the University of California. 



Family AMPHARETIDAE 

 Amage tumida Ehlers 



Amage tumida Ehlers (1887), p. 220, pi. 48, figs. 10-19. 



These differ from Ehler's description in the number of somites, 

 but it seems best to list the three specimens in the collection with 

 Ehler's species. 



Collected in haul 1112, off La Jolla in 45 fathoms on green mud 

 and fine sand; and in haul 1123, off La Jolla on a muddy bottom in 

 160 fathoms. 



Amphicteis alaskensis Moore 



Amphicteis alasTcensis Moore (1905c), p. 846, pi. 44, figs. 1-4. 

 Collected in haul LXX-5, off La Jolla in 54 to 118 fathoms on 

 mud and soft black shale. 



