. Guide leaflet. Stage 5lynognatbiis Stage 6Opossum Stage 7Notharctos Stage 8Gibbon iG. 8B. THE SECOND FOUR STAGES FROM FISH TO MAN. (From ground-dwelling to tree-dwelling) The Third Stage, from the Carboniferous age, represents the oldest known typeof four-footed animals. The skeleton of the hands, feet and limbs is much moredeveloped than in the previous stage. There are five digits on each of the handsand feet. The Fourth Stage represents the primitive reptilian or lizard-like stage, from theLower Permian of Texas. The skeleton on the whole is not greatly different fromthe preceding stage (
. Guide leaflet. Stage 5lynognatbiis Stage 6Opossum Stage 7Notharctos Stage 8Gibbon iG. 8B. THE SECOND FOUR STAGES FROM FISH TO MAN. (From ground-dwelling to tree-dwelling) The Third Stage, from the Carboniferous age, represents the oldest known typeof four-footed animals. The skeleton of the hands, feet and limbs is much moredeveloped than in the previous stage. There are five digits on each of the handsand feet. The Fourth Stage represents the primitive reptilian or lizard-like stage, from theLower Permian of Texas. The skeleton on the whole is not greatly different fromthe preceding stage (except in detail) but the limbs were better developed. The Fifth Stage represents an advanced mammal-like reptile {Cynognatlius) fromthe Upper Triassic of South Africa. In this form the limbs were better adapted forrunning and there are many features of the skull, backbone and limbs that approachthose of mammals. For the Sixth Stage the skeleton of a modern opossum was used. It retains in themain the leading char
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnatural, bookyear1901
