22 
CLASS ANNELIDA. 
N. longa , Ott. Fab., which M. Savigny places with N.Jtava , 
in his genus Eteone : all these annelida should be carefully 
examined afresh, according to the detailed method of M. 
Savigny* 
We must not confound these phyllodocm of M. Savigny 
with those of M. Ranzani, which are allied to the aphroditas, 
and particularly to the polynoae. 
Alciopa, Aud . and M. Edwards . 
They have pretty nearly the mouth and tentacula of 
phyllodoce ; but their feet, independently of the tubercle 
which supports the bristles, and the two foliaceous cirrhi, or 
gills, present two branchial tubercles, which occupy their 
superior and inferior edges, Alciopa Reynaudii , Aud. and 
Edw. Of the Atlantic Ocean. The pretended Nats Ralhke , 
Soc. d’ Hist. Nat. de Copenh. v. part i. pi. iii. f. 15, may very 
probably be an Alciopa. 
Spio, Fab . and Gmel. 
The body is slender; there are two very long tentacula, 
which have the appearance of antennae, eyes in the head, and 
on each segment of the body a gill on each side, in the form 
of a simple filament. These are the small worms of the 
Arctic Ocean, which inhabit membranous tubes, Spio seti - 
cornis , Ott., Fab., Birl., Schr. VI. v. 1 — 7 ; Spio filicornis , 
ib. 8 — 12. The PoLYDORiE, Bose. vers. I. v. 7., appear to 
me to belong to this genus. 
Syllis, Sav., have tentacula of an uneven number, articu- 
lated like the beads of a rosary, as well as the superior cirrhi 
of the feet, which are very simple, and have but a single 
parcel of bristles. It appears that there are some varieties 
relative to the existence of their jaws, Syllis monilaris , Sav., 
Eg. Annel. iv. f. 3. copied. Diet, des Sc. Nat. — N. B. The 
Nereis ar miliar is, Mull. vers. pi. ix., of which, without 
