Abstract
Observations are made on the development and the presence of a Saccus Vasculosus in Tilapia mossambica and other cichlids.In those cichlids that do not possess a saccus vasculosus the development of this organ is apparently suppressed in a very early stage of life.A saccus vasculosus is present in all those American and Indian cichlids that were investigated, but this organ was not found in cichlids indigenous to the African continent.

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