256 
POSTSCRIPT. 
Cardium edule. p. 30. 
Variety D. With one of the valves larger and inclosing 
the other within it, the beak curving over it. 
Specimens of this singular variety we observed in the 
cabinet of Mrs. C. W. Loscombe, of Exmouth. 
Cardium aculeatum. p. 28. 
Walker, f. 83, 84. The very young shell. 
Opportunities of comparing these minute shells, the 
Cardium imiricatulum of modern authors, from the sands 
of Torbay, with the C. aculeatum in its several stages of 
growth, incline us to think they are of the same species. 
They are of a pale yellowish color, semitransparent, with 
the cartilage side somewhat angular and truncate, and 
round the margins and at the sides are clothed with minute 
spines. Our references therefore of Walker’s figures to 
C. medium should be removed. 
Dentalium eburneum. p. 37* 
This and our D. politum, p. 38, do not correspond with 
the characters of the Linndan species under these denomi¬ 
nations, and we must therefore consider them as distinct 
and nondescript; suggesting that the former be altered to 
D. album , and the latter to I). Iceve . 
Helix Ericetorum. p. 49. 
Da Costa , pi. 4. f. 8. 
Lepas cornuta. p. 73. 
Some clusters of what appeared to he of this species 
were lately gathered from the bottom of a vessel, in Ex¬ 
mouth. They were entirely of a dusky-brown color: the 
mouth in opening wide-oval, slightly cloven at the top, with 
a tubercular projection on each side the cleft, and on the 
left-hand side, below the tubercle, are several irregular fiat 
projecting foliations, v. v . 
Lepas dentata. p. 71. 
# We have lately taken large masses of the several varie¬ 
ties of this shell, and are fully convinced that they all be¬ 
long to L. anserifera. Every conchologist knows the dif¬ 
ficulty of exact discrimination between these two species : 
but 
