a baby's vision fully develops as the infant grows.
a baby's vision fully develops as the infant grows.
when does a baby's vision fully develop?
as the infant grows
Na
Na
pisidium casertanum









































pisidium casertanum, the pea cockle or pea clam, is a minute freshwater bivalve mollusc of the family sphaeriidae.









































section::::description.









































the shell is broad, sub-triangular or oval and is ornamented with sculpture of faint concentric striations. the umbos are slightly behind the middle. the periostracum is silky, scarcely glossy. in colour it is whitish to grey-brown and often the shell is coated with reddish-brown deposits.









































the shell is of similar shape to "sphaerium novaezelandiae" but is smaller as an adult, more inflated, with a deeper hinge-plate, stronger teeth, and the ligament is not visible externally.
pisidium casertanum