316 U.S. NATIONAL MUSEUM BULLETIN 227 



postsetal lobes of first 2 segments lanceolate, directed anteriorly on 

 each side of prostomium, subeqiial, with a fan-shaped group of setae 

 directed anteriorly and surpassing the prostomium, the notosetae 

 more slender than the neurosetae, all ending in capillary tips. On 

 setiger 2, the notosetae are present as a distinct group. The neuro- 

 setae form a wide fan-shaped bundle of arched stouter and shorter 

 setae, tapering to short fine tips (Fauvel indicated some were sub- 

 acicularlike ; none seemed to be specialized as acicular spines as in 

 T. multisetosum). Ventrally large mouth with lateral and lower lips 

 formed by first two setigerous segments. 



Setiger 3 (fig. 83,^,1) with fan-shaped group of slender capillary 

 notosetae and a comblike row of neurosetae consisting of 4-6 stout 

 curved acicular spines alternating with slender capillary setae. 

 Notopodial and nem'opodial postsetal lobes elongate-ovoid. Setiger 4 

 with longer capillary notosetae. Neurosetae shorter and slightly 

 stouter than notosetae, tapering to fine tips. Notopodial postsetal 

 lobes cordiform. Neuropodial postsetal lobes wider and shorter, oval. 



Setigers 5 to 9 make up rest of thoracic region (fig. ^2>,j,k). Noto- 

 podia with fan-shaped bundles of numerous capillary notosetae, 

 straight or slightly curved, smooth or very finely spinous. Neuro- 

 podia with fan-shaped bundles of numerous setae of two kinds: 

 (1) long, thin, doubly curved, very finely spinous neurosetae with 

 capillary tips; (2) 5-8 stouter neurosetae occupying center of bundle, 

 curved, tapering to slender tips, widely limbate on curved part, with 

 striated or hairy border. Postsetal lobes globular to cordiform. 



Middle or anterior abdominal region begins on setiger 10, with 

 notopodia absent, with few transitional neuropodia. Neuropodia form 

 conical lobes, with neurosetae consisting of few (1-3), heavy, hairy 

 projecting acicular setae and few, slender, hairy capillary setae. 

 Neuropodial postsetal lobes digitiform and with subpodal undulate 

 thin flanges extending posteriorly to following septa. 



Biology. — Found in deep water on bottoms of fine mud. 



Material examined. — Off Massachusetts (Albatross Station 2076, 

 41°13' N., 60° W., 906 fathoms, blue mud (two anterior fragments). 



Distribution. — Off Nova Scotia to off Massachusetts. In 740 

 to 906 fathoms. 



