Natural History: Its Rise And Progress in Britain As Developed in the Life ...
Natural History: Its Rise And Progress in Britain As Developed in the Life ...
Nicholson Henry Alleyne
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Similarly, in the backward progress, one may pass naturally enough from the Vertebrates to the Molluscs, through the cuttle-fishes (Cephalopods). In order to complete the circle, however, there remains the final step of passing from the Molluscs to the Protozoa (the Acrita), two groups separated by a hiatus unbridged by any intermediate form. Similarly, in the circular series of the Vertebrate animals, starting with the Amphibians (frogs and newts) as the assumed lowest group, we pass naturally... enough to the reptiles, and from the reptiles to the nearly related group of the birds. From the birds one may get to the Mammals by the help of the oviparous duck-mole and spiny ant- R ETROGRESSION. 177 eater. Or, if we pass in the other direction, we travel quite naturally from the Amphibians to the fishes. In either case, however, in order to complete the circle, one has to get from fishes to Mammals, or vice versa. The gap thus caused is, however, a hopeless one, since the really intermediate groups of the reptiles and the birds have been left on the other side of the circle.
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