Points from Foregoing Letters


    PROF. H. A. HARRIS puts forward the view that the even-toed ungulates are not so highly specialized as would appear to be the case in view of the reduction of the digits to two and the absence of a clavicle. In the sheep embryo, a clavicle appears and various additional digits in the fore and hind foot. These are rapidly lost, either by absorption as in the case of the clavicle, or by incorporation in the neighbouring bony elements. The second and fifth metatarsals are buried in the substance of the rapidly growing third and fourth, which fuse to form the cannon bone.

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    Points from Foregoing Letters. Nature 138, 934 (1936). https://doi.org/10.1038/138934b0

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