BELONGING TO A NEW ORDER OF THE CLASS CIRRIPEDIA. 329 
punctures irregularly distributed; but whether for functional 
purposes, or merely accidentally resulting from the close approxi- 
mation of the animal to the surface, could not be determined : 
they are not unfrequently partially closed up with calcareous 
matter. 
The stain is caused by the animal appearing through, which 
lies immediately below the surface of the matrix. This must be 
broken before the animal can be removed, and then it is found 
to be «:ths of an inch long, and ysths of an inch wide at the 
broadest part, of an irregular ovate form, considerably depressed 
behind, where it expands into a broad circular disc; and narrow 
and compressed in front, forming a sort of produced neck or head 
with a longitudinal slit on the upper surface ;—the general form 
resembling considerably, a Roman lamp, the slit representing the 
orifice for the passage of the wick. The produced portion, or 
head, corresponds to the valvular part of the pedunculate Cirri- 
pede, and contains the body and arms or feet,—the slit being 
analogous to the usual opening for the passage of these prehen- 
sile organs: there, are, however, no shelly plates whatever, the 
mantle being soft, fleshy and highly contractile, having the sur- 
face distinctly marked with fine longitudinal muscular fibres 
below; this part arches deeply into the matrix, and joins, rather 
abruptly, the under surface of the depressed disc-like portion of 
the animal, considerably behind the posterior end of the longi- 
tudinal slit. The margins of this slit are perfectly straight, 
thickened, and have somewhat the appearance of horn, but can- 
not be considered as forming distinct plates, though they com- 
pose, as it were, two valvular lips, which can be closed or opened 
at the will of the animal; in front they gradually blend with the 
mantle, behind, they are deeply notched, and each terminates in 
a projecting, slightly curved point. The external surface of 
these valvular lips, is furnished with numerous, minute, irregu- 
larly disposed, rather stout, curved spines, very transparent and 
of a crystalline appearance. ‘The circular depressed, disc-like 
portion of the animal, corresponding to the pedicle of the pedun- 
culate Barnacles, is slightly arched below, where it is pale, soft, 
fleshy, and as highly contractile as the anterior portion or head: 
