310 PROCEEDINGS OF THE ACADEMY OF [April, 



the base, where they dwindle away. When the proboscis is everted 

 the paragnaths become more or less erect and form a formidable and 

 bristling armature. The ventral bands are borne on a pair of rather 

 sharp ridges and each consists of two series of horny papillae, those of 

 the more medial series (PI. XXI, fig. 167) being larger with broad 

 crescentic, flat bases and somewhat bent, acute, conical tops. Those 

 of the more lateral series are more complex (fig. 168), about one-third 

 to one-half as high as the inner papillae, truncate and bent and bearing 

 on the convex side a thick, horny scale or plate with three short spines 

 at its lower border. Both kinds have a subapical pore and both become 

 smaller toward the jaws, to which the bands nearly reach. Papillae 

 of the dorsal bands are larger and stouter, especially those of the 

 inner or more medial series, which are clawlike, directed toward the 

 middle line, with a broad base and subapical pore (fig. 169). Sup- 

 porting these, between and behind them, are three irregular rows of 

 somewhat smaller papillae similar to the principal ones, except that 

 they are more or less bifid at the apex, a feature which is very obvious 

 on the tall papillae at the middle of the series (fig. 170). All of these 

 papillae are very hard and homy and continue to the jaws without 

 material decrease in size, but in the opposite direction, toward the 

 base of the proboscis, gradually become reduced. Between the four 

 armed bands are a few minute spheroid papillae with roughened 

 summits (fig. 171). 



The circle of soft jaw papillae appears to comprise twenty. Jaws 

 black, the principal pair (fig. 166fl) ventral, the width of four or five 

 soft papillae apart, with three (sometimes four) large, clawlike teeth 

 and on the medial side an additional very small tooth or none. No 

 ventral arc of small jaws. Dorsal arch of about thirty small, double, 

 quadridentate jaw^s consisting of a larger anterior and a smaller pos- 

 terior pair mostly like b (fig. 166), but a few like c. 



Color variable, pale yellow, light brown, often with bluish reflections, 

 drab, etc., more or less mottled with dusky, and those from station 

 3,454 exhibiting a few quadrate black spots. The general color of 

 the type is a clear amber-brown with the furrows and median dorsal 

 field bluish-gray and the prostomium pale gray. In the posterior 

 region the color is almost entirely blue-gray, except on the parapodia 

 which retain the brown. Neural eye-spots dark brown, very con- 

 spicuous in the posterior region. 



Represented usually by single specimens from the following stations : 

 4,309, 4,310, off Point Loma Lighthouse, near San Diego, 67-78 

 fathoms, fine sand, green mud and rocks ; 4,332, same locality, 62-183 



