Abstract
D r . T homas B oyle G rierson transmitted to me for description three more or less perfect small skulls, which all belong to the genus Procolophon , instituted by Professor Owen for some small reptiles from the Tafelberg. Dr. Grierson's specimens were collected by Mr. Donald White from Donnybrook, Queenstown District, Cape Colony. They are contained in a hard red ironstone matrix, often crystalline, which is apparently concretionary, and invested one skull much in the same manner as the clay-ironstone of our own country often invests Carboniferous fossils. The matrix can be removed only in part, because the bones and the cavities between them are frequently filled with brittle and crystalline carbonate of lime. Hence the thin film of external bone is often broken away in the endeavour to develop the specimens.
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