. The origin and evolution of life, on the theory of action, reaction and interaction of energy. is very similar to that of the solid-headed Amphibia (Steg-ocephalia). Bone by bone its parts indicate a common descent from the skull type of the fringe-finned fishes (Crossopterygia,Fig. 53)- As revealed by the researchesof Cope, Williston, and Case,the adaptive radiation of thereptile life of western Americain Permian time is as follows:First there is a variety of swift-moving, alert, predaceous formscorresponding to the fusiform,swift-moving stage in the evolu-tion of the fishes. Some ofthese r
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. is very similar to that of the solid-headed Amphibia (Steg-ocephalia). Bone by bone its parts indicate a common descent from the skull type of the fringe-finned fishes (Crossopterygia,Fig. 53)- As revealed by the researchesof Cope, Williston, and Case,the adaptive radiation of thereptile life of western Americain Permian time is as follows:First there is a variety of swift-moving, alert, predaceous formscorresponding to the fusiform,swift-moving stage in the evolu-tion of the fishes. Some ofthese reptiles (Varanops) re-semble the modern monitor liz-ards (Varanus); others {Oplii-acodon and Theropleura) areprovided wath four well-devel-oped limbs and feet, the long tailbeing utilized as a balancingorgan. These were littoral orlowland reptiles, insectivorousor carnivorous in habit. Theprimitive, lizard-like pelycosaur Varanops, with a long tailand four limbs of equal proportions, represents more nearlythan any known ancient reptile, apart from certain specialcharacters, a generalized pro
Size: 2066px × 1209px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkcscribnerss
