SABELLIDES AND SERPULIDES 213 



Branchial lobes forming low spires of about 2 turns, with 70 or So 

 short (about 16 mm.), stout, stiff, rarely divided branchiae. Eyes very 

 small and few in number. 



Collar deep along the sides, curving abruptly and obliquely from the 

 dorso-lateral notches to the rounded ventral ends. 



Thoracic segments 8 ; abdominal segments in a medium-sized per- 

 fect specimen about 240; one very large mutilated one has over 325 

 segments. 



The former is 6.5 inches, or 164 mm. long, 12 mm. along thoracic 

 setae, and 8.5 mm. broad at base of collar. Large ones are 12 mm. 

 broad, and probably attain a length of 10 or 12 inches. One of the 

 smallest specimens, with about 100 segments, is 30 mm. long and about 

 2.5 mm. broad. 



Tubes covered with rather coarse black and variegated sand, which 

 in turn is sometimes overspread by compound ascidians. 



Yakutat, June 22, seven specimens ; Ocean Cape, Yakutat, five 

 specimens; Sitka, June 17, one specimen. 



EUDISTYLIA TENELLA sp. nov. 

 pi. xxii, figs. 2, 3 ; pi. xxni, figs. 4, 5; pi. xxxin, figs. 16, 19, 24; pi. xxxiv, 



fig. 12 ; Pl. XXXV, fig. 22. 



Type locality. Victoria, Vancouver Island, British Columbia. 



This species is at once distinguished by its very delicate branchiae, 

 the inner edges of their very slender rachises bordered by opaque yel- 

 lowish crenulations from which the exceedingly fine cilia-like pinnae 

 arise. 



In the largest specimen the segments are irregularly developed on 

 both the thorax and abdomen, especially along the middle portion, 

 where some are divided on one side and others on the opposite side, 

 the total number, however, being about the same (175) ; of these 10 

 on the left side and 1 1 on the right side belong to the thorax, the ir- 

 regularity occurring on the first three segments. Three smaller speci- 

 mens are, however, symmetrically developed and have but 8 thoracic 

 segments. 



Branchial lobes forming low spires of about 2 turns, bearing from 

 70 to 75 very slender branchiae in an irregular double series, measuring 

 about 1 6 mm. in length, usually of a very delicate pink color, some- 

 times with a broad band of deep wine color near their tips. Eyes none. 



Collar with inconspicuous dorsal lobes, and wide shallow lateral 

 notches, from which it slants obliquely forward to the small ventral 

 ends. 



