ì. . . oviparous quadrupeds appeared much
sooner than viviparous quadrupeds. . .î
ì. . . the land quadrupeds came only a long time later. . . . all the genera unknown today. . . belong to the oldest of the formations that are in question here.î
ì. . . unknown species that belong to known genera. . . are not found at all with these older genera.î
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