180 
SPECIFIC DESCRIPTION. 
scattered hairs. The disconnected valves are 
placed at the precise distance at which they were 
situated from each other when they were detached 
from the animal, which is preserved in spirits. 
The dried specimen, which is figured in two 
positions, is probably much contracted, as three of 
the valves are imbricated : this shows, also, the 
portion of the shell which is exposed, about one 
third of each valve. The pores exist in this as well 
as the preceding species, but are much smaller, 
and scarcely discernible except when they are 
artificially distended. There is no visible commu- 
nication between the external perforations and the 
lungs ; it is not easy therefore to determine their 
use or functions. The fact of the valves not being 
at all times approximate, will scarcely prevent this 
species from being justly ranked in the genus 
Chiton, as the valves are constructed so as to lie 
partially one over the other, and from the muscular 
contraction of the animal are doubtless often so 
arranged. But it can hardly be denominated Cryp- 
toconchus, as a considerable part of the s/iel/ is not 
hidden. The two species and larvceformh 
are however obviously of the same genus. 
