SABELLIDES AND SERPULIDES 



207 



Victoria, Vancouver Island, British Columbia, June i, one poorly- 

 preserved specimen ; New Metlakatla, Annette Island, June 4, three 

 very young specimens ; Yakutat, June 19, numerous specimens, 



SCHIZOBRANCHIA NOBILIS sp. nov. 



pl. XXIV, fig. 3; pi. XXVIII, fig. 7; p1. xxxiii, fig. 22 ; pi. xxxv, figs, i, 3-6, 



8, 10, II, 23. 



Type locality, — Orca, Prince William Sound. 



This species often has the v^hole body pervaded with pink or light 

 wine color, and is larger than the preceding (6*. insignis')^ with 

 longer (about 23 mm.), more flexible, and more numerous branchiae, 

 there being about 26 in the outer series in each lobe, but similarly 

 divided, the longest 4 times ; the pinnae are less crowded, forming 

 more tapered ends. 



Eyes numerous, varying in size and arrangement, sometimes with 

 a diagonal line of pigment. 



Many of the specimens are without posterior portions. The largest 

 has 72 segments in a length of about 165 mm., or 6.5 inches. It is 

 about 8 mm. broad at base of collar, and the 8 thoracic segments meas- 

 ure about 15 mm. along setse. Two specimens " killed in formalin" 

 are much contracted, and vary in breadth at base of thorax from 10 to 

 12 mm. The anterior fascicles of setae form very oblique series, and 

 on one specimen number 9 in a length of 15 mm. ; on the other there 

 are 8 in a length of 12.5 mm. Both have lost posterior portions, 

 one having 60 segments in a length of 72 mm., the other 80 segments 

 in 98 mm. In one the branchiae, which number about 22 in each lobe, 

 are beautifully expanded, the longest measuring about 30 mm. They 

 are stout, unequal at base, and not regularly dichotomously divided, 

 some having 4 and 5 divisions, so that some of the tips are double and 

 some single, and may number 26 on a single branchia. Young speci- 

 mens common at Dutch Harbor, Unalaska Island, about 3 mm. broad 

 and from 25 to 75 mm. long, have from 6 to 8 thoracic segments, 12 

 to 16 pairs of branchiae, the longest divided 2 or 3 times; occasion- 

 ally one has 3 primary or basal divisions. A single specimen from 

 Virgin Bay, Prince William Sound, differs from these in having 10 

 thoracic segments ; on one side two of them have two fascicles of setae 

 and two tori. A few specimens contain eggs, 



Orca, Prince William Sound, June 25-26, several specimens ; 

 Virgin Bay, Prince William Sound, June 27, one immature specimen ; 

 Dutch Harbor, Unalaska Island, July 8 and 17, many young. 



