Cephalopterus hypostomus.—Echeneis lunata. 411 
fin, at only half an inch behind the eye. I would submit also to Mr. Ben- 
nett’s notice the substitute for teeth with which the edges of both lips.are 
provided, in the form of a ‘* pave” of flattened semi-transparent oblong 
hexagonal bony substances. Several Rays have a structure somewhat 
similar, but Ihave never yet seen that any authour has adverted to it, 
although it is assuredly deserving of attention, as well for its suitableness 
to the animal’s wants, as for its regularity and beauty *. 
The next object to be mentioned is an Echeneis, which it seems to me 
cannot with propriety be considered as Ech. Naucrates, and, if not, must 
be regarded as a new species undescribed. Of this J send two specimens, 
the intestines of one of which I was obliged to have taken out, on ac- 
count of the degree of putrescence they came into before I had finished 
the notes and sketch I took of it. This individual was a male, and mea- 
sured 325 inches from the apex of its inferior jaw to the tip of the upper 
portion of the caudal fin. The other was an inch and a half longer, but 
from the flabbiness and light colour, and mottled appearance of the skin, 
I supposed it to be an old one or else in a sickly state, and therefore a less 
perfect specimen of the proper colour of the species than the shorter one; 
especially as one or two others in a very healthy state that I have seen 
were exactly of the same dark hue with the latter. My chief reasons for 
considering it as a distinct species from Ech. Naucrates are that the 
Naturalists, whose works I have been able to consult, agree in assigning 
the following characters to 
* The several Fishes forwarded by Dr. Bancroft were exhibited at the 
Meeting of the Committee of Science and Correspondence of the Zoological 
Society on September 27, 1831. Of this exhibition a notice was published in 
the “‘ Proceedings” of the Committee (Part J, p. 134), together with characters 
of the new species, 
That of the Cephalopterus is as follows: 
CEPHALOPTERUS Hypostomus, Ceph. levis; ore infero; pinnarum pec- 
toralium margine antico declivi recto ; spiraculis in fossa sub basi anticd 
pinnarum pectoralinm positis. 
Tas, Super. L, 
