Abstract
The results taken in the present investigation may be condensed as given in the following lines.
1. In the natural conditions, reproductive substances of Corbicula sandai are emitted in a smoky manner from exhalent siphon. The fertilization takes place in water.
2. The egg is about 129 μ in diameter, with coating about 43 μ thick, which is scarcely cohesive, and has a nature of sinking.
3. The spermatozoa survive from 30-40 minutes to an hour after ejected in water.
4. At the water temperatures of 20-25°C, the larva forms the umbo about 90 hours after fertilization. At about 70 hours, prodissochonch-shelled larva 180 μ long hatches out from coating and immediately becomes to take benthic life, having no free-living stage.
5. The process of development suggests that Corbicula sandai may belong to an intermediate type between the groups of C. leana and C. Japonica
