DE. BAIRD ON SEVERAL GENERA OF EUNICEA. 357 



tacular cirri. Tentacle, antennae, and palpi annulated at the in- 

 ferior or basal portion. 



Sp. 1. Htalin(ecia tubicola. 



Nereis tubicola, Muller, Zool. Dan. i. 18, tab. 18. f. 1-6. 



Leodoce tubicola, Savigny, Syst. des Annel. 383. 



Onuphis tubicola, Sars, Beskr. og Jaktt. 48 ; Quatrefages. 



Northia tubicola, Johnston, Cat. Non.-Parasit. Worms, 136. 



Hyalincecia tubicola, Malmgren, I. c. 6". 



Ilab. Shores of Great Britain, Scotland, South Devon, Corn- 

 wall, &c. (Brit. Mus.) ; Asia Minor (McAndrew) ; North Sea 

 {Malmffren). 



As there seems to be some little obscurity about this species, I 

 shall first describe the animal as it occurs in such specimens as 

 we possess, and afterwards make a few critical remarks as to its 

 name and position. 



The body of the animal is generally about 2^ inches long. The 

 tube which it inhabits, and which is horny, cylindrical, and exactly 

 like the barrel of a small quill pen, is about 3| inches long. The 

 head presents the appearance, on the buccal surface, of two lobes, 

 as in Eunice. The antennules are very short, rounded-oval, and 

 are attached to the front of the apex of the cephalic segment. The 

 tentacle is longer than the antennae or palpi, and is annulated at 

 the base. The antennae, which spring from the head-lobe along 

 with the tentacle, are of the same form as this organ, but a little 

 shorter. The palpi spring from the side of the cephalic segment, 

 and are still shorter than the antenna?. All these organs are an- 

 nulated at the base, but do not appear to be jointed throughout 

 their length. The eyes are two in number. The jaws are in 

 three pairs — one pair curved, simple, a second strong and armed 

 with twelve strong denticulations ; the third pair are denticulated 

 also, and armed with about six denticles. The two or three up- 

 permost or most anterior of the feet are prominent, have a large 

 setiferous tubercle with three cirri implanted on its surface, and 

 project straight upwards. On the succeeding feet the ventral 

 cirrus soon disappears, leaving only in its stead a round tubercle. 

 The dorsal cirrus on the lower half of the body is long, lying on 

 the back, and takes the place of a branchial organ of only one 

 filament. 



Feet : — Setae of two kinds only, simple and pectinate. Simple 



setfe long, lanceolate, flattened or broadly limbate towards the 



upper half, and finely pointed. Pectinate setae rather long ; pec- 



