1923] NATURAL SCIENCES OF PHILADELPHIA 225 



The setae are numerous and arranged in two rows in the large 

 fascicles. All are of one type, colorless, with bilimbate ends much 

 like those of Notoprotus but more slender and elongated. 



The uncini (Plate XVIII, fig. 30) are small and numerous, upwards 

 of 100 on a detached segment of unknown number. They are 

 arranged in two facing and interlocking series and reseml)le those 

 of certain terebellids iPistn). 



A few segments of tube (the largest 70 mm long) have a diameter 

 of 2.3 mm. and are of a deep-brown color, horny, laminated and 

 friable. One tul^e is thinner and orange-colored. 



All specimens come from the vicinity of Cape Pinos, Monterey 

 Bay, on bottoms mostly of gray but occasionally of green mud 

 and at depths varying from 75 fathoms (station 4523) to 766 

 fathoms (station 4517). 



Stations 4508, 4510, 4517, 4523, 4524, 4526, the last yieldnig the 

 type and two cotypes. 



Praxillura maculata sp. nov. Plate XVIII, figs. 31, 32. 



Head, including the small posterior peristomial annulus, one and 

 two-thirds times as long as deep. Profile gibbous, continuing 

 direction of anterior segments for caudal three-fourths of dorsum, 

 then dropping at right angles for slightly more than one-half depth 

 of head and then again bending sharply forward as a broad pro- 

 jecting lip. There is no trace of a cephalic limbus and the region 

 of the disk is much reduced, consisting of a depressed area on the 

 steep frons bounded by the lip below, slight, cheek-like swellings 

 laterally and a slight frontal prominence above. Within this area, 

 occupying the steep portion of the profile, is the very short low 

 median carina, scarcely longer than broad, separated by faint 

 transverse grooves from the lip below and the frontal i^rominence 

 above and bounded laterally by the longitudinal limbs of the 

 nuchal organs. Nuchal organs rather distinct, each consisting of 

 two limbs of approximately equal k^ngth, one longitudinal, straight, 

 and bounding the carina, the other diverging latcrad and cephalad 

 at an angle of about 110° and slightly curved. On the caudal part 

 of the head a small annulus is rather distinctly cut off and there are 

 a number of irregular transverse furrows. Afouth very large, 

 occupying most of the ventral surface of the head and bouiuled 

 by loose wrinkled lips. No eye-spots can be detected. 



Anterior setigerous segments very short, the first two together 

 about equal to the total length of the head. They increase gradually 

 and by VIII or IX the length equals the diameter. These segments 

 are separated by deep furrows and are strongly biannulate, the 

 anterior setigerous ring being three times the length of the posterior. 

 The first four or five are rather strongly giljbous at the sides 

 ventral to the sette but this condition soon disappears At XIII 



