Abstract
Cerithium adustum and Cerithium nodulosum collected from the rocky shore on the Red Sea were karyotyped. These two species showed a distinct differentiation in the diploid chromosome number (2n=18 and 16 respectively). The karyotype of Certhium adustum consists of: six metacentric pairs and three submetacentric pairs while the karyotype of C. nodulosum consists of: two metacentric pairs, three submetacentric pairs and three telocentric pairs. Shell measurements of these species are also described in details in this paper. These results are reported for the first time in Egypt.
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