100 
SUPPLEMENT 
a disposition more or less tentacular, according as, from being 
lateral, they become more and more dorsal, or frontal. We 
may then very well apply a common denomination to those 
tentacula, since their origin is the same, and distinguish them 
only, as they are altogether superior, or lateral. 3. A species 
of neck, as some authors have made of it, formed of the nar- 
rowest and shortest rings, which immediately follow the 
cephalous rings, and the entire appendage of which is almost 
rudimentary. But these rings are something less distinct 
than the others, the traehelian rings passing by little and little 
into the thoracic, and those again being less distinct from the 
abdominal. We may, however, consider as such those whose 
appendages are the most complete, and especially in the 
branchial part. As for the coccygeal, or post-anal rings, there 
are never more than one, terminated by a short point, a little 
dagger-wise. 
The appendages may be equally divided into cephalous, 
cervical, thoracic, abdominal, and praBanal. 
Considering the cirriform, or tentacular appendages of the 
cephalous rings, as of the same nature and of the same 
origin, we may, for the purpose of rendering ourselves better 
understood, divide them into superior or frontal, and into 
lateral. 
The teeth, more or less deeply placed, will be distinguished 
from the masses of corneous tubercles, equally unciform 
sometimes, which arm the rings of the proboscis, by their 
size and their development, and even sometimes by their 
calcareous nature. 
There is no objection to preserving the name of eyes, (al- 
though it is very doubtful whether they be really organs of 
vision,) for the black orbicular spots which are remarked upon 
the principal cephalous ring of a tolerably great number of 
nereides, and their consideration should not be neglected, as 
