89 
Lam. except that the callosity lays in the contrary direction to what 
it does in those species. The only one I know of was extricated from 
a mass of the whetstone, which still fills its matrix, Plate VI. Fig. 2. 
It is so thoroughly silicious, as to be transparent, where the matrix 
is not interposed. 
Lamarck describes three species of this genus as French fossils : 
A 7 . label lata,, N. epiglottina, N. cepacea. 
LXI. Testacella. An obliquely conical formed univalve, with the 
summit a little turned spirally ; the opening oval, with the right edge 
turned inwards. 
LXII. Stomatia. An oval auriform univalve, with a prominent 
spire : the opening ample, and longer than wide ; the disk imperforate. 
LXIII. Carinaria. A very thin univalve, in the form of a cone 
flattened on its sides, the apex terminating in a very small involuted 
spire, and the back having a dentated keel : the opening entire, oval- 
oblong, contracted towards the angle of the keel. 
No remains of any shells of the three preceding genera have, I 
believe, been found fossil ; nor are the inhabitants of the two latter 
shells known. 
LXIV. Haliotis. A flattish, ear-formed shell, with a depressed 
spire, and a row of round holes along the right edge. The opening 
very large, and much longer than wide. 
M. Bose observes that these shells are often found fossil in France 
and Italy. On this point I am obliged to observe, that, from the in- 
formation which I have gained, from the sight of different collections, 
and from the examination of different authors, I conceive the contrary 
of this to be the fact. Indeed, of the seventeen species which M. 
Bose enumerates, he mentions but one species, Haliotis plicata, as 
having been found fossil. I do not indeed, therefore, hesitate in 
saying, that the shells of this genus are among the rarest fossils. 
The nearest approach to this genus is a shell which is sometimes 
found among the fossils of St. Peter’s Mountain, and has been hitherto 
VOL. III. -kt 
