. Agricultural zoology. Zoology. 74 ZOOLOGY. Besides the true Gulls (Larus), I will only mention the Sea Swallows (Sterna), with forked Fig. 4d.—Herring Gull (^Larus argentatus). CLASS III.: REPTILIA (REPTILES). Cold-blooded Vertebrates (p. 19). The heart has the same structure as in Mammals and Birds, but the left and right ventricles are usually only incompletely divided from one another (p. 20). The body is invested with horny scales or with bony plates covered by a horny layer. Reptiles are very unlike Birds in appear- ance, but present many essential points of resemblance to them
. Agricultural zoology. Zoology. 74 ZOOLOGY. Besides the true Gulls (Larus), I will only mention the Sea Swallows (Sterna), with forked Fig. 4d.—Herring Gull (^Larus argentatus). CLASS III.: REPTILIA (REPTILES). Cold-blooded Vertebrates (p. 19). The heart has the same structure as in Mammals and Birds, but the left and right ventricles are usually only incompletely divided from one another (p. 20). The body is invested with horny scales or with bony plates covered by a horny layer. Reptiles are very unlike Birds in appear- ance, but present many essential points of resemblance to them in their skeleton; indeed, during earlier geo- logical times, there were transitional forms between the two classes. The structure of the reptile egg, too, is very similar to that of the bird's egg; but the first has no lime-salts deposited in its shell. The egg is not hatched out by the animal itself, but exposed to. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bos, Jan Ritzema, 1850-1928; Ainsworth Davis, J. R. (James Richard), 1861-1934. London, Chapman & Hall, Ld.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
