General guide to the exhibition halls of the American Museum of Natural History . I- 1 r ? ??IlMi** ar y>» Stage 5Wvnognathus. Stage 6Opossum Stage 7Notharctus Stage 8Gibbon THE SECOND FOUR STAGES FROM FISH TO MAN. (From ground-dwelling to tree-dwelling) The Third Stage, from the Carboniferousage, represents the oldest known type offour-footed animals. The skeleton of thehands, feet and limbs is much more developedthan in the previous stage. There are fivedigits on each of the hands and feet. The Fourth Stage represents the primitivereptilian or lizard-like stage, from the LowerPermian of T
General guide to the exhibition halls of the American Museum of Natural History . I- 1 r ? ??IlMi** ar y>» Stage 5Wvnognathus. Stage 6Opossum Stage 7Notharctus Stage 8Gibbon THE SECOND FOUR STAGES FROM FISH TO MAN. (From ground-dwelling to tree-dwelling) The Third Stage, from the Carboniferousage, represents the oldest known type offour-footed animals. The skeleton of thehands, feet and limbs is much more developedthan in the previous stage. There are fivedigits on each of the hands and feet. The Fourth Stage represents the primitivereptilian or lizard-like stage, from the LowerPermian of Texas. The skeleton on the wholeis not greatly different from the precedingstage (except in detail) but the limbs werebetter developed. The Fifth Stage represents an advancedmammal-like reptile (Cynognathus) fromthe Upper Triassic of South Africa. In this form the limbs were better adapted for run-ning, and there are many features of the skull,backbone, and limbs that approach those ofmammals. For the Sixth Stage the skeleton of amodern opossum was used. It retains in themain the leading characters of the skeletonsof the old
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Keywords: ., bookcentury1900, bookdecade191, booksubjectnaturalhistorymuseums
