142 



EUNICiE. 



form of an obtuse lobe, without antennae or with rudimentary tuber- 

 cle-like antennae : eyes two or none : mouth with eight jaws in 

 opposed pairs, supported on a double stalk : feet small, uniramous, 

 with simple setaceous bristles in a divided fascicle : cirri none. 



1 . L. tricolor, head semiovate, entire, without any appendage ; the 

 first two segments apodous ; feet all similar, the upper lobe conoid, 

 prolonged beyond the obtuse setigerous lobe, which has a curved 

 process at its base ; bristles bifasciculate ; a tuft of very short 

 bristles at the base of the foot. Length 10" ; breadth 3'". 

 Nereis tricolor, Mas. Leach. 



Hah. South Devon, G. Montagu. 



Besc. Lumbriciform, equally convex on both surfaces, narrowed 

 towards the extremities, smooth and iridescent, with brilliant blue 

 reflexions in the sutures. Head a semiovate entire lobe without any 



No. XXII. — Lumhrineris tricolor. 





1 . Three of the upper jaws. 



2. The foot. 



3. The foot slightly compressed, to 



show the superior fascicle of 



bristles. 



4. Bristle magnified. 



appendage, smooth, projecting forwards over the mouth, the line 

 behind straight or a little sinuated, where there are two dark spots 

 obscurely marked, which may be eyes. Mouth inferior, armed with 

 a series of black jaws (No. XXII. fig. 1 ) which are very coarsely 

 dentate on the edge, and each pair differently from the others. First 

 and second segments apodous, nearly equal. Segments numerous, 

 all alike, narrov?, the sutures impressed, smooth. Feet (figs. 2 & 3) 

 forming a narrow neat edge along the sides, uniramous, bilobed, the 

 upper lobe obtusely conical, elongated, and produced far beyond the 

 setigerous lobe, which is rounded, with a curved process at its base. 

 Bristles (fig. 4) in two fascicles, colourless or straw-yellow, simple. 



