Abstract
Egg masses of two species of Nerita; viz., N. albicilla and N. textilis, are reported for the first time from the coast of Karachi, northern Arabian sea. The egg capsules of N. textilis are similar to those of N. albicilla but larger in size. The dimensions of the egg capsules and larvae of these species are also presented. Allometric studies of N. albicilla and N. textilis showed that shell height increased faster than width in all the populations. Relative growth of the shell width decreased with increasing shell height in all populations of N. albicilla. Coefficient of variation for shell height and shell width of N. albicilla varied with seasonal changes.
