206 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 



ventro-lateral and the cirrus at the dorso-lateral angle, resulting 

 in the quadrate section of this region already referred to 



Paleoli form compact palmae which may reach not quite to the 

 end of the prostomium or as much as one-fifth of their length be- 

 yond it as they are retracted or projected. They vary in number 

 from 11 to 15, in part correlated with the size of the worm. They 

 are of a rich yellow or l)rownish-yellow color, striated and burnished, 

 somewhat flattened, gently tapered, slightly curved at the ends 

 and when perfect rather abruptly contracted into a very slender 

 and elongated mucron having a length of 2-3 times the maximum 

 diameter of the paleolus. Seta fascicles generally prominent, 

 suberect, arising in a gentle arc, arranged in from 10-14 pairs, 

 each composed of a large and a smaller more slender seta both 

 tapering and very acute, with a narrow limbus especially narrow 

 on the smaller one. On the first two fascicles they are fewer and 

 much smaller. Uncini in long lines just behind the free border of 

 the tori, very numerous (190 on X), fewer on abdominal segments 

 and decreasing in number caudad. Thoracic uncini nearly color- 

 less, usually with six (sometimes five) major teeth above the small 

 inferior one; lower angle produced forward rather prominently 

 like a chin. Abdominal uncini not appreciably difTerent. 



The type is 48 mm. long, of which the thorax is 28.5 mm., maxi- 

 mum width at anterior end 4.5, width at anterior end of abdomen 

 3.5 mm. Other specimens vary from 19 to 50 mm. long, most 

 of them being 35-40 mm. 



Fragments of tubes show that they are composed at one end of 

 thick mud walls 7 mm. in diauieter, and at the other are soft and 

 mucoid. 



Stations 4322 (type and cotypes), off Point La Jolla, 110-199 

 fathoms, green mud and shells; 4343, off South Coronado Island, 

 55-155 fathoms, fine gray sand; 4366, off Point Loma Lighthouse, 

 176-181 fathoms, green mud; 4381, off N. Coronado Island, 618- 

 654 fathoms, green mud; 4452, off Point Pinos Lighthouse, 49-50 

 fathoms, green mud, fine sand; 4457 (cotypes), same locality, 40-46 

 fathoms, dark green mud; 4467, off Santa Cruz Lithghouse, 51-54 

 fathoms, soft dark green mud; 4482, off Santa Cruz Lighthouse, 

 43-44 fathoms, soft green mud; 4513, off Point Pinos Lighthouse, 

 389-456 fathoms, green mud; 4533 (cotype), same locality, 144-293 

 fathoms, green mud and sand. 



The greatest number of specimens (16) were taken at Stations 

 4452; 4457 and 4467 in the vicinity of Point Pinos, Monterey Bay, 

 in 40-54 fathoms. 



