200 Mr. Montacu’s Account of some new and rare 
back, and nearly meeting those on the opposite side: the two 
tentacula are not quite filiform, but taper a little, and are articu- 
lated, or furnished with numerous joints, which gives them a 
crenated appearance ; their length is nearly half as long as the 
body: between the tentacula, but generally obscured by them, 
are four black eyes, placed in pairs: on the front of the head is 
a short bifid snout, connected at the base. ; 
The tube or case in which these animals reside is extremely 
tender, composed of minute adventitious matter slightly agglu- 
tinated together; it is usually attached to Sertularia. Like 
most of the Amphitrites, the body of this animal is concealed 
within its tube, and the feelers or tentacula alone are displayed ; 
and these are in constant motion, being thrown about in all di- 
rections, though they are capable'of instantaneous contraction. 
* When the animal had been divested of its covering, and suffered 
to be quiescent, the tentacula were generally coiled up spirally, 
and then appeared much wrinkled.. The largest I have observed 
did not exceed half an inch independent of its feelers ; the colour 
is pale, with pink cirri. : ; 
- This species, which is not an üncommon inhabitant of our 
coasts, is without doubt a Spio, although it does not strictly ac- 
cord with the Gmelinean characters, being possessed of four 
eyes: to this family the Polydore cornue of Bosc, tom. i. pl. 5. 
Jig. 7. belongs, by reason of the same number of eyes ; in other 
respects it does not sufliciently correspond with the present sub- 
ject to induce an opinion that they are the same species. In 
some respects this appears to be somewhat allied to Spio filicornis, 
but I have referred to it with considerable doubt. 
MEDUSA 
