The common carp,Cyprinus carpio Linn. has been studied for tracing the ossification centres in its skull. A large number of early developmental stages of the embryos and larval forms were sectioned at 10 micra and these sections were stained with Delafield’s haematoxylin and counter-stained with eosin for studying the bones. Alizarine transparencies of various stages were also made. Five stages have been investigated and described.