288 PROCEEDINGS OF THE ACADEMY OF [April, 



Parapodia are remarkable chiefly for the position of the neuropodia. 

 The rami are rather large, widely separated and rather conspicuous 

 papilla?. Notopodia situated at the extreme dorsal and widest part 

 of their segments, except on the first few at the basal angles of the 

 triangle. Owing to the slender papillae which they bear they have 

 the form of graceful plumes or tassels bearing a few small capillary 

 setae. Neuropodia are rather larger, stouter and shorter subcorneal 

 tubercles, resembling the false feet of certain caterpillars, and bearing 

 much smaller and less conspicuous papillae and a single stout hooked 

 seta. Except on the first eight or ten segments which are more or less 

 subterete and where they are widely separated, the bases of the two 

 neuropodia are nearly in contact at the neural apex of the compressed 

 triangular body. 



Notopodial and collar setae (PI. IX, fig. 62) are all of the capillary, 

 soft, flexible, cross-fractured type, the former differing only in their 

 much greater length. In addition to a few, scarcely apparent, rudi- 

 mentary setae of the same type each neuropodium bears one (or rarely 

 two) large and stout hook (fig. 63), deep brown and opaque at the end, 

 but becoming paler toward the base and having an imperfect joint 

 below the hooked end. These hooks are directed toward the middle 

 line and are operated in pairs by powerful muscles, forming most 

 effective organs of adhesion. 



Dorsal surface and notopodia more or less deep (sometimes purplish) 

 brown, which color usually completely covers the collar and may extend 

 somewhat down the sides of the body which, like the venter and 

 neuropodia, is pale yellow, usually sharply contrasted with the brown 

 of the dorsum which appears to be due to the sensory papillae. 



The alimentary canal exhibits the gizzard-like stomach and looped 

 intestine characteristic of annelids of this family. Unlike most species 

 of the genus there is no mucous investment, at least on these specimens. 



The four known specimens were taken at Picnic Tables, near Monterey, 

 Cal., on August 14, 1904, from among the spines of Strongylocentrotus 

 purpuratus. The latter is undoubtedly a normal habitat, for which 

 the structure of the worm admirably adapts it. The color, lateral 

 compression of the body, position of the neuropodia and the stout 

 neuropodial hooks would be especially useful in this situation. 



SABELLIDJE. 



Sabella elegans Bush. 



Sabella elegans Bush, Tubicolous Annelids from the Pacific Ocean, Harriman 

 Alaska Expedition Reports, 1905, pp. 194, 195 (figures). 



Vicinity of Monterey Bay only; four specimens "big tide pool," 



