458 ANNELIDES. 



Alciopa, Aild. and M. Edw. 



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

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

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

 branchial tubercles which occupy their superior and inferior 

 edges(l). 



Spio, Fab. and Gm. 



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

 ance of antennae; eyes in the head and on each side of every seg- 

 ment of the body; branchiae in the form of a simple filament. They 

 are small worms from the Arctic Ocean that inhabit membranous 

 tubes(2). 



Syllis, 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 bundle of setae. It appears that there is some variety re- 

 lative to the existence of the jaws(3). 



Glycera, Sav. 



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

 conical point resembling a small horn, and divided at the summit 



Nereis stellifera. Mull., Zool. Dan., pi. Ixii, f. 1, of which, without having seen it, 

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

 Ott., Fabr., placed by Savig. with the iV. Jlava in his genus Eteone: 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 Itanzani, 

 which are allied to the Aphroditae, and particularly to the Polynoes. 



(1) Alciopa Reynaudii, Aud., and Edw., — from the Atlantic Ocean. — The pre- 

 tended iVais iZa^Me, Soc. Hist. Nat. Copen., V, part I, pi. iii, f. 15, may very poss- 

 ibly be an Alciopa. 



(2) Spio seticomis, 0\X.,Tsihv., Berl., Schr., VI, v, 1 — 7; — Spio JiKcomis, lb., 

 8 — 12. The PoLTDoniE, Bosc, Ver. I, v, 7, appear to me to belong to this genus. 

 Spio, the name of a Xereid. 



(3) Syllis monilaris, Sav., Eg., Annel., IV, f. 3, copied Diet, des Sc. Nat. 

 N.B. The Nereis annillaris. Mull., Ver., pi. ix, of which, without having seen it, 

 M. Savigny proposes to make the genus Lxcastis, has tentacula and cirri formed 

 like a rosary as in Sj'Uis, but the tentacula are represented as being in even num- 

 bers. It should be examined. 



