136 ANNELIDES. 



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

 ple laminae, or even simple filaments or tubercles. The jaws or ten- 

 tacvda are wanting in some of them. 



Phyllodoce, Sav. — Nereiphylla, Blainv. 



The Phyllodoces, like the true Nereides, have an even number of 

 tentacula on the sides of the head, and four or five small additional 

 ones before. They are furnished with eyes ; their large proboscis, 

 which is studded with a circle of very short fleshy tubercles, presents 

 no jaws, and, Avhat particularly distinguishes them, their branchiae 

 resemlde broad leaves, arranged in a single row on each side of the 

 body, and overlapping each other ; finely ramified vessels are distri- 

 buted over them *. 



Alciopa, Aiid. and M. Edw. 



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

 but the feet, independently of the tubercle which supports the setee 

 and the two foliaceous cirri or branchiae, are furnished with two 

 branchial tubercles which occupy their superior and inferior edges f . 



Spio, Fab. and Gm. 



The body slender ; two very long tentacula which have the ajipear- 

 ance of antcnnge ; 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, and inhabit membranous tubes |. 



Sylus, 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 liave 



* Nereis lumellifera aHaniica, Pall., Nov. Act. Petrop., II, pi. v, f. 1 1 — 18, per- 

 haps the same as the NereiphyUe de Pareto, Blainv., Diet, des So. Nat. ; — N, fluva, 

 Ott., Fabr., Soc. Hist. Nat. Copenhag:., V, part I, pi. iv, f. 8 — 10. 



N. B. The N. riridis, Miill., Yer., pi. xi, of which, without having seen it, M. 

 Savigny proposes to make the genus Eulalia, and the two Eunomi.e, Risso, Eu- 

 rop. !Merid., IV, p. 420, also appear to me to be Phyllodoces ; perhaps we should 

 also so consider the Nereis itinnigeru, Montag., Lin. Trans., IX, vi, 3 ; and the 

 Nerds slelUfera, Miill., Zool. Dan., pi. Ixii, f. 1, of which, without having seen it, 

 Savigny proposes to make a genus by the name of Leptdia ; and the N. longa, 

 Ott., Fabr., placed by Savig. with the A"", fava in his genus Etkone : All these 

 Annelides require to be carefully examined according to the detailed method of M. 

 Savigny. 



We must not confound these Phyllodoces of Savigny with those of Ranzani, whicli 

 are allied to the Aphroditse, and particularly to the Polynoes. 



■y Alciopa Rei/nmtdii, Aud., and Edw., — from the Atlantic Ocean. — The pretended 

 Nuis Rtith/ce, Soc. Hist. Nat. Copen., Y, part T, pi. iii, f. 15, may very possibly be 

 an Alciopa. 



+ Spio seiicornis, Ott,, Fabr., Berl., Schr., YI, v, 1, 7 ; — Spio filicornis, lb., S — 

 12. The PohYOOR-G, Bosc., Yer. I, v, 7, appear to me to belong to this genus. 

 Spio, the name of a Nereid. 



