52 
No shell of either of these genera appears to have been found fossil. 
VII. Calyptrcea. A conoidal univalve, with the apex erect, entire 
and rather pointed, the cavity furnished with a spirally convoluted 
lip or diaphragm. 
It is to this genus, as Calyptrcea trochiformis , that Lamarck refers 
the fossil which Solander, in consequence of its possessing a kind of 
spire, has considered as a trochus, denominating it Trochus apertus ; 
and in another state, tuberculated and more depressed, Trochus oper- 
cularis. Fossil. Hautoniens. Tab. ix. Fig. 1, 2, 3. These are found 
in the Hampshire cliffs, with the other fossils, figured in the work of 
Brander, just referred to. They are also found, in a very fragile state, 
between Woolwich and Blackheath, in the parish of Plumstead, in 
Kent. Lamarck also describes another shell, found with the former 
at Grignon, which he considers as a distinct species, C. crepidularis, 
from its not being completely orbicular, and from its having its spire 
bent downwards, as in the crepidulce. 
Another species of this genus, Plate V. Fig. 10, found in the Essex 
cliffs, appears exactly to agree, in its form, with Patella sinensis, 
Lin. as figured by Lister, Tab. lxvi. Fig. 39- It forms a depressed 
cone, with a circular base and mammillary apex, and should perhaps 
be distinguished as Calyptrcea sinensis. Some specimens of this shell, 
which I have obtained from the neighbourhood of Harwich, have 
their upper part completely invested with a mineralized spongy, or 
alcyonic, mass. 
VIII. Conus. A turbinated, convoluted, inversely conical univalve ; 
the aperture long, narrow, toothless, and not contracted at the base. 
Of the genus Conus, Lamarck describes four species, as found at 
Courtagnon and Grignon : — G. antediluvianus, C. deperditus, C. 
turritus, and C. stromboides. 
C. deperditus, distinguished by its channeled spire, I have also ob- 
tained from the Veronese territory. From this place I also obtained 
the fossil shell, Plate V. Fig. 1, which very nearly accords with 
