Testudo radiata.

Tortoises, terrapins, and turtles London, Paris, and Frankfort :H. Sotheran, J. Baer & co.,1872. biodiversitylibrary.org/page/2948251
Source Tortoises terrapins and turtles : drawn from life
http://biodiversitylibrary.org/page/2948251
Author James de Carle Sowerby, 1787-1871 ; John Edward Gray, 1800-1875; Edward Lear, 1812-1888
Source: https://commons.wikimedia.org/wiki/File:N62_Sowerby_%26_Lear_1872_(astrochelys_radiata).jpg

The radiated tortoise (Astrochelys radiata) is a species in the family Testudinidae. Although this species is native to and most abundant in southern Madagascar, it can also be found in the rest of this island, and has been introduced to the islands of Réunion and Mauritius.