DORS1BRANCHIATA. 297 



foot long, of a reddish colour, and diffuses an abundant yellowish liquid 

 when touched. It has thirteen pairs of branchiae. 



AMPHOOME, Brug. 



A pair of more or less complex, tufted or plumose branchiae on each ring of 

 the body, and to each of the feet two fasciculi of separate setae, and two 

 cirri? no jaws to the proboscis. The Amphinomes are divided by M. Sa- 

 vigny into CHLOEIA, PLEIONE, EUPHKOSINE and HIPPONOE. 



EUNICE, Cuv. 



The branchiae are also plumose, but the proboscis is well armed with three 

 pairs of differently formed horny jaws; each foot is furnished with two cirri 

 and a bundle of setae, there are five tentacula above the mouth and two on 

 the nape. In some species only do we find two small eyes. 



Eun. gigantea, Cuv. The largest of the known Annulata, being upwards 

 of four feet in length. From the sea of the Antilles. 



After these genera with complex branchiae, we may place those 

 where they are reduced to simple laminae or slight tubercles, or in 

 which they are even replaced by cirri. 



Some of them are still allied to the Eunices, by the strong arma- 

 ture of their proboscis, and their azygous antennas. Such is the 



LTSIDICE, Sav. 



Where, with jaws similar to those of the Eunices, and even more nume- 

 rous and frequently azygous, the only branchiae consist of three tentacula 

 and the cirri. 



AGLAURA, Sav. 



The jaws of the Aglaurae are also numerous and azygous, consisting of 

 seven, nine, &c.; but their tentacula are either wanting or completely con- 

 cealed; the branchiae are also reduced to cirri. 



NEREIS, Cuv. 



The true Nereides have an even number of tentacula, attached to the sides of 

 the base of the head, and a little further forwards two others that are biarti- 

 culate, between which are two simple ones. Their branchiae consist of small 

 laminae between which is spread a net-work of vessels; each foot is also 

 furnished with two tubercles, two fasciculi of setae, one cirrus above, and an- 

 other beneath. 



In the vicinity of these Nereides are grouped several genera in 

 which the body is also slender, and the branchiae are reduced to 



2 N 



