DR. BAIRD ON SEVERAL GENERA OF EUNICE A. 359 



of these cirri also disappears, one cirrus only remaining. Tail- 

 cirri two in number. 



The tube in whicb tbe worm lives is pellucid, soft, of a thin 

 horny texture, and appears fitted closely to the body of the animal, 

 wrapping it tightly around. 



This species is much narrower and more slender than tuhicola, 

 and is altogether much smaller. The two longitudinal red lines 

 running along its back are very distinct and characteristic. 

 The cirri maintain the number of three for about a third of the 

 length of the body, instead of only on three or four of the anterior 

 feet ; and the tube is very different from that of tuhicola. 



Hob. Off the coast of Cornwall, at a depth of from 20 to 40 

 fathoms water {Lauqhrin, Mus. Brit.). 



Sp. 3. Htalincecia varians, Baird. 



Worm about an inch in length, slender, of a slightly metallic 

 lustre throughout. The tube is slender, cylindrical, about 1^ inch 

 long, of a horny substance, and contains the animal freely in it. 



The head is rather small, but the organs springing from it 

 are long. Antennules oval, springing from the anterior edge of 

 the head, broader and considerably longer than those in tuhicola. 

 Tentacle longer than any of the other organs. Antennae shorter 

 than tentacle, and palpi shorter than antennae. All these five 

 organs are closely annulated at their base, having a distinct joint 

 a little distance from the annulated portion, and being then indis- 

 tinctly jointed at distant intervals during their length. 



The anterior feet are rather prominent, and the cirri implanted 

 upon them very short and small. The setiferous tubercle, giving 

 origin to the fascicle of setae, is placed between two large cirri in 

 the succeeding pairs of feet. Dorsal cirri, or branchial filaments, 0]j 

 the upper half of the body long, then suddenly becoming shorter as 

 they descend to the lower half Setae of two kinds only, simple and 

 pectinate. Simple setae long, very sharp-pointed, of a lanceolate 

 form, and slightly curved, the flattened lanceolate portion being 

 near the apex. Pectinate setae rather long, with numerous pecti- 

 nations or teeth, all on one plane. No aciculae or spines to be seen. 

 Uncini in general forcipate at the extremity. Tail furnished with 

 two rather long cirri. 



This is the general appearance presented by this species. In 

 many points, however, there are variations from this normal struc- 

 ture. The setae of the feet vary much in number, the greater 



