Ip4 BUSH 



Collar four-lobed, circular, with a slightly undulating rolling edge, 

 the lateral slits in front of the fascicles of setaB, or ventro-lateral, often 

 marked by a spot of color ; ventral lobes small ; dorsal lobes wanting, 

 the ends widely separated on the back, showing the cephalic region 

 with a deep median furrow defined by a conspicuous ridge on each 

 side. Inside the collar, opposite the ventral fissure, is a small, trian- 

 gular, median, somewhat bilobed cephalic swelling, often with two 

 conspicuous spots of color, bordered by a thin, often ruffled membrane. 

 Extending inward from this, along the base of each branchial lobe, is a 

 thin, moderately developed, often much ruffled membrane, which, 

 folding on itself, terminates at the ventral end of the lobe. Mouth 

 protected on each side by a moderately developed membranous lobe 

 supporting a very long, conspicuous, regularly tapered dorsal tentacle. 



Fascicles of setae forming oblique series on the thorax, of two forms, 

 the superior ones linear, the inferior round and protected by an auri- 

 form membrane ; those on the abdomen comma-shaped. 



All the setae limbate, of one form, long, regularly tapered, lanceo- 

 late, the two equal sides, seen only in a direct front or back view, ap- 

 pearing as a single border, as given by Malmgren in a direct profile 

 view ; varying in width, the superior ones much narrower than the 

 inferior and fewer in number ; on the abdomen they are less regularly 

 tapered. Along the tori on the thorax are two forms, avicular hooks 

 and pennant-bearing or pennoned * setae ; on the abdomen avicular 

 hooks only. 



Atypical example of the type (Sabella pavonina Savigny 1809) 

 has not been seen. The above description refers to forms like Sabella 

 crassicornis Sars (1851). 



Sabella melanostigma Schmarda (1861), given by Ehlers (1887) as 

 a typical example of his interpretation of this genus, Saint- Joseph 

 (1894) placed in his new genus Eurato, under the second group in 

 his analytical table, for genera having avicular hooks only in the tho- 

 racic tori. Treadwell (1901) recorded this species from Porto Rico. 



SABELLA ELEGANS sp. nov. 



pi. xxvi, fig. 2; pi. xxvii, fig. 6c; pi. xxxni, figs. 20, 21 ; pi. xxxiv, figs. I, 4, 

 5, 10 ; pi. xxxvn, figs. 12, 33. 



Type locality. Kadiak. 



1 These setae of the tori have the exposed end of the long shaft or manubrium 

 expanded into a short, more or less cordate-shaped, usually striated portion, bear- 

 ing a long transparent, flexible, pennant-like terminal portion. 'Cucullate,' 

 1 mucronate,' ' en pioche,' and other terms have been used as descriptive of them. 



