200 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 19 



Notosetae of the first setiger are of two kinds; an anterior transverse 

 row of five or six, coarse, spinelike setae (Fig. 2) is located in front of a 

 posterior row of eight or nine slenderer, capillary ones (Fig. 3). The 

 corresponding neurosetae are slender, capillary only, as in all successive 

 parapodia. Median and posterior parapodia have, in addition, shorter, 

 furcate setae in which the tines are spreading (Fig. 4) and the inner 

 margins are serrated ( Fig. 5 ) . 



Parapodia are short and truncate throughout ; the setae emerge in 

 front of short, postsetal lobes. Cirri are altogether absent, hence the spe- 

 cific name. The pygidium is a smooth ring without cirri. 



Sc/crochiilus acinatiis differs from other species of the genus in lack- 

 ing cirri. It may approach S. mlnutits (jrube, from the ^Mediterranean 

 Sea (Fauvel, 1927, p. 125), in having a single anterior segment with 

 acicular setae. It differs from 5". niiniitus in that these acicular spines are 

 distally prolonged to slender tips, and the prostomium has four, instead of 

 two eyes. The frontal extensions of the prostomium are continuous with 

 the lobe, not set off by constrictions. 



5. acirratiis has been taken only in White Cove, Santa Catalina 

 Island, in shallow depths, from holdfasts of Eiscnia arborca (kelp). The 

 species was first identified from samples taken by the VELERO III 

 (See Eraser, 1943, for Station data), in holdfasts of this kelp. "Fhe same 

 locality was investigated by Mr. Robert Given, where the same species 

 was again located. It has been found nowhere else. 



Genus Asclerocheilus Ashworth, 1901 



Asclerocheilus californicus Hartnian, 1963 



(Plate 5, Figs. 6-9) 



Asclerocheilus calif orniciis Hartman, 1963b :56-57. 



1 he botiy is long, arenicoliform, measures 43 mm long by 6 mm wide, 

 and consists of more than 70 segments. The prostomium is triangular, 

 broadest behind, and has a pair of thick, short, frontal processes resem- 

 bling a pair of short antennae (Fig. 6) ; eyes are absent. 1 he posterior 

 end terminates in a pygidium surrounded by five short, tapering cirri ; 

 one is midventral and the others are lateral ; the anal aperture is cen- 

 tered. Dorsal and ventral cirri are absent. Posterior parapodia are char- 

 acterized by the great prolongation of superior and inferior lobes (Fig. 

 7) resembling dorsal and ventral cirri; they are first present from neuro- 

 podium six and notopodium seven, and continue long farther back. 1 he 

 first two setigerous segments have thick, acicular curved spines (Fig. 8) 



