334 PROCEEDINGS OF THE ACADEMY OF [June, 



of small globoid cirri. On the dorsum is a <-shaped group of con- 

 spicuous black eye-spots which extend on to somite II. Typically 

 there seem to be two pairs, but frequently there is an additional pair 

 of spots or a median spot anteriorly. 



Segments short and uniannular or slightly and irregularly annulated, 

 mobile and irregularly contracted in the different regions; posteriorly 

 becoming very small and tapering into a minute pygidium which bear 

 a pair of spherical cirri with small apical papillse and in addition a 

 minute median cirrus or papilla. Surface, particularly toward the 

 ends of the body, bearing numerous small, pointed or somewhat clavate 

 retractile papillse which are evidently of a sensory nature and become 

 larger in the neighborhood of the parapodia. 



Parapodia (PL XV, fig. 11) rather inconspicuous, lateral, probably 

 uniramous. They consist of a slender, conical setigerous neuropodium 

 roughened with small, conical, sensory papillse becoming longer towards 

 its distal end, which terminates in an especially prominent one or 

 postsetal lobe. A much stouter process arising from the postero- 

 ventral. region of the neuropodium, having nearly the structure of the 

 sensory papillse, is undoubtedly the neurocirrus. Quite distinct from 

 and well dorsad of the neuropodium is a spherical prominence (noto- 

 podium?) bearing on the middle of the distal face a small clavate 

 cirrus. The spherical body is largest and most conspicuous on middle 

 segments, but the distal cirrus is larger, both relatively and absolutely, 

 at the ends. These organs are enveloped in a thick cuticle and the 

 interior is filled with a snarl of slender, elongated bodies and opaque 

 brownish granules, giving to the entire organ its characteristic opacity. 

 A short distance farther dorsad is a clavate papillse similar to that 

 borne by the spherical body but more slender and elongated, especially 

 on middle segments. 



Neuropodial aciculum single — a rather stout, yellowish, tapered 

 spine ending in a simple, blunt, somewhat projecting point. Setae 

 few, about four to six, projecting unequal distances in an irregular 

 fascicle in each neuropodium (fig. 11). All are simple, colorless, rather 

 stout, the shafts straight or nearly so, the ends expanded into a blade- 

 like extremity with a knife-like edge rising into a slightly curved point 

 and passing at the base into a slightly differentiated lateral spur. 

 They exhibit little variety in shape or proportions (PI. XV, fig. 12). 



Proboscis unknown. Color nearly uniform pale yellow, faded, the 

 eye-spots deep brown. 



Six specimens from station 4,400, off San Diego, April 8, 500 fathoms 

 green mud. 



