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 tlieir 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 immediatel}' follow the 

 cephalous rings, and the entire appendage of which is almost 

 rudimentary. But these rings are something less distinct 

 than the others, the trachelian 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 praeanal. 



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 



