298 ANNUL AT A. 



simple laminae, or even simple filaments or tubercles. The jaws or 

 tentacula are wanting in some of them. 



Phtiiodoce, Sav. 

 The Phylhcbces, like the true Nereides, have an even number of tenta- 

 cula on the sides of the head, and four or five small additional ones before. 

 They are furnished with eyes; their large proboscis, v/hich is studded with 

 a circle of very short fleshy tubercles, presents no jaws, and, what particu- 

 larly distinguishes them, their branchiae resemble broad leaves, arranged in 

 a single row on each side of the body, and overlapping each other; finely 

 ramified vessels are distributed over them. 



Alciopa, Aud. and M. Edw. 

 The mouth and tentacula nearly similar to those of the Phyllodoces; but 

 thefeet, independently of the tubercle which supports the setae and the 

 two fohaceous cirri or branchis, are furnished with two branchial tubercles 

 which occupy their superior and inferior edges. 



Spio, Fab. and Gm. 

 The body slender; two very long tentacula which have the appearance of 

 antennae; eyes in the head and on each side of every segment of the body; 

 branchiae in the form of a simple filament. They are small worms from the 

 Arctic Ocean that inhabit membranous tubes. 



Smis, Sav. 

 An odd number of tentacula articulated like the beads of a rosary, as well 

 as the superior cirri of the feet, which are simple and have but a single bun- 

 dle of setae. It appears that there is some variety relative to the existence 

 of the jaws. 



Gltcera, Sav. 

 The Glycerse are recognized by their head, which is a fleshy and conical 

 point, resembhng a small horn, and divided at the summit into four 

 scarcely visible tentacula. The proboscis of some still presents jaws; in 

 others, they are said to be imperceptible. 



Nefhthts, Cuv. 

 The proboscis of the Phyllodoces, but no tentacula; two bundles of widely 

 separated setae on each foot, between which is a cirrus. 



LuMBKiNERA, Blainv. 

 The tentacula wanting; but a single small forked tubercle, from which issues 

 a little bundle of setae, on each articulation of the elongated body. If there 

 be any external organ of respiration, it can only consist of an upper lobe of 

 this tubercle. 



