Materials for the Study of Variation Treated With Especial Regard to Discontinui
Materials for the Study of Variation Treated With Especial Regard to Discontinui
Bateson William
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B. The same from the internal side. C. Left foot from in front. From a drawing of specimen in U. S. Nat. Mus. , kindly made for me by Prof. Eidgway's direction. under Professor Eidgway's supervision and sufficiently shew its structure (Fig. 122). [It will be seen that the hallux in A, the right foot, appears on the outside; this I conceive is due to partial rotation to shew the abnormal toes. ] Besides these there are a few amorphous cases of extensive repetition of digits in birds. These facts... shew how fruitless a work it is to try to find a general statement which shall include all the cases. There is an almost unbroken series of conditions starting from either duplicity of the hallux, or from the presence of an internal rudimentary chap, xiii. ] DIGITS : LIZARD. 395 digit, up to a condition somewhat resembling that of " double- hand " in Man. If the first digit behind the hallux is the prae- hallux, what are the digits on the tibio-tarsus ? If on the other hand the appearance of an extra digit internal to the supposed hallux is to be evidence that this " hallux, : is the index, it may equally be argued that if two digits come up internal to the " hallux " then the supposed hallux is the medius, and so on inde- finitely.
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