Although Sarcocystis infections are very common in the muscle of mammals, and to a less extent of birds, in reptiles they have oniy rarely been seen. In a list given by Wenyon (1926) only two forms are recorded, namely from the muscles of Africaii geckoes and of the lizard Gongylus. The form here described was found in fairly large numbers in the striated muscle tissue of the Australian carpet snake Python spilotes. For the parasite the name Sarcocystis pythonis is suggested.