BELONGING TO A NEW ORDER OF THE CLASS CIRRIPEDIA. 337 
therefore be physically impossible for Serpule to develope them- 
selves on the under surface of such appendage. It is probable, 
then, that the basal plate of Lithotrya, is nothing else but a 
broken valve of either Clavagella, or of some small oyster that 
has been growing in the deserted abode, most likely of Clavagella, 
or perhaps of Lithodomus*. 
Clitia verruca, which is unprovided with a shelly base, certainly 
sinks slightly into the shells to which it adheres; but this cannot 
be considered a burrowing Cirripede. <Alcippe lampas, the name 
by which I propose to designate our new species, is the only one 
of the class, which according to our present knowledge, can be so 
considered. It is the only one, at least, that entirely conceals 
itself in chambers of its own making, in hard calcareous bodies. 
I have not been able to examine into the method by which 
the excavations are effected; a fresh and numerous supply of 
specimens will be required for this purpose. I shall now only 
observe on this interesting part of the subject, that, in this Cirri- 
pede, we have a proof that an animal as highly organized as the 
Mollusca, can bury itself in hard calcareous substances without 
the aid of shelly plates; and that the walls of the burrow of this 
animal, exhibit, in a peculiar manner, the structure of the shelly 
matrix. This however might result either from a solvent, or 
from the application of minute cutting bodies, on a highly con- 
tractile, soft, and pliant surface. 
From the above general review of the characters and habits of 
this animal, we observe at once that it differs in so remarkable 
a manner from both the Campylosomata and Acamptosomata,— 
orders established by Leach, for the accommodation of the two 
great divisions, the pedunculate and sessile Barnacles,—that it 
becomes necessary to form a new order for the reception of this 
curious Cirripede. This order I propose to characterize as fol- 
lows :— 
Order CryPTosoMATA. 
Animal naked, burying itself in some foreign substance, at- 
* Whilst this was passing through the press, I have been assured by Mr. C. 
Darwin, and his opinion on this subject is of the greatest value, that the basal 
cup of Lithotrya is undoubtedly formed by the animal, and that it has the 
power of enlarging the cavities in which the larva takes up its abode. 
