NO. 2 HARTMAN : QUANTITATIVE SURVEY 199 



laterally directed, their extended length 3.5 to 5 times as long as the body 

 is wide. The prostomium is broad, thick, nearly semicircular; eyes have 

 not been identified. The buccal region is triannulate, with each ring 

 smooth, and longer than the prostomium or any body segment. 



The first pair of branchiae are on the posterior margin of the third 

 buccal segment. Branchiae are inserted immediately above the notopodial 

 ridge, in median and posterior segments. Most branchiae have been lost 

 from the specimen, so that it looks rather like a spindle-shaped oligo- 

 chaete. All setae in anteriormost segments are slender and capillary. 

 Thick, short, acicular spines are first present in neuropodia 32, or behind 

 the anterior, inflated region ; they number only one or two in a fascicle, 

 and are located at the lower end of the fascicle; they are accompanied 

 by slenderer, longer capillary setae. Similar but slenderer acicular spines 

 also occur with long, slender, capillary setae. These spines are translucent 

 yellow, nearly straight, taper to blunt points, and never number more 

 than two or three in a fascicle, where they are accompanied by capillary 

 setae. 



This Ctrratulus sp. has been taken only from West End, Santa Cata- 

 lina Island, in 256 fms. 



Family SCALIBREGMIDAE 

 Genus Sclerocheilus Grube, 1863 



Sclerocheilus acirratus, new species 



(Plate 5, Figs. 1-5) 



Collections: Sta. 1370 (4, TYPE) ; Sta. 1378 (2), White Cove, in 

 £/5c«M holdfasts (2). 



Small individuals, yellow-orange in life, fading to colorless in alcohol, 

 measure about 8.6 mm long by 1.4 mm wide near the middle of the body; 

 they consist of 31 to 50 segments. The surface epithelium is rugose, with 

 transverse annulations, or papillate, coarsest on the dorsum and less so 

 ventrally. Median and posterior segments are quadri-annulated, with the 

 rings equally long and most distinct in middle segments. Branchiae are 

 absent. The prostomium is broadly T-shaped, with the lateral extensions 

 continuous with the prostomium ( Fig. 1 ) . Two pairs of transverse red- 

 dish eye patches are conspicuous on its posterior half, with the two patches 

 on a side near together, and the anterior ones the larger. The first seg- 

 ment is a short, smooth ring. The second, or first setigerous, segment is 

 about twice as long as the first one ; it has biramous parapodia with noto- 

 podia dorsolateral, and neuropodia lateral. 



