DESCRIPTION. 191 



Fig. 2. 3. 4. C. larvcEJormis . 



Shell 8-valved, valves without any keel, dissi- 

 milar, covered partially with the membrane. 



Specimens having the three posterior valves 

 white and smooth, blueish flesh-coloured at the 

 sides, the others brown and striated ; coriaceous 

 membrane rough, cinereous olive, with a few scat- 

 tered 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 po- 

 sitions, 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 scarce- 

 ly discernible except when they are artificially 

 distended. There is no visible communication 

 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 spe- 

 cies from being justly ranked in the genus Chiton, 



