352 MERISTIC VARIATION. [i-ART I. 



FACKENHEIH, l,C. t p. 359, tig. iv.). Thus do the two conditions pass 

 into each other, though some cases are clearly cases of duplicity ami 

 some are clearly cases of extra digit in Succession 1 . 



I know no case of unruistakeable duplicity in any digit liut pollex or 

 hallux ; but no doubt a good many cases of extra digit arising from the 

 minimus may be of this nature (e.g. ANXANDALE, PI. in., fig. 28), though 

 it is more likdy that the extra digit is in Succession. 



In digits other than I or V the only case of possible duplicity known 

 to me as occurring in a limb not exhibiting one of the complex conditions 

 of polydactylism, are those of SlREXG ( Vierteljahrsschrij't f. ;//<//,/. //<///-.. 

 \i. i \. 1 >">!), p. 178; original not seen by me; quoted by GKUBER, 

 p. 47 ( 'i>, being a case apparently of double medius on one metacarpal : 

 and of hrssKAC, Cut. Slus. Vrolik, No. 518, two terminal phalan-es on 

 riirlit medius (together with double thumb; six fingers on left hand 

 and peripheral duplicity of hallux in each foot). Accompanied by 

 numerical Variation in other parts of the digital series such cases 

 of duplicity are known in a few other cases. 



(3) Combinations of thu foregoing. 



Limbs not rarely present the forms of polydactylism already named 

 in combination. Such combination may be found in the same limb, or 

 one or more limbs may present one form, while another form may be 

 found in the other limb or limbs. Of these combinations the following 

 three cases will be sufficient illustration. 



Case of double hallux on each foot, and rudimentary digit attached /<// 

 peduncle to tJie minium* of each hand. 



516. A female member of a polydactyle family [particulars given] had an abortive 

 supernumerary finger attached by a peduncle to the little finger of each hand. In 

 the feet the two yreat toes were each partially double. In the left great toe the 

 individual phalanges could be felt and there were two nails. In the great toe 

 of tin- right foot tin; adjacent sets of phalanges were inseparably united by their 

 lateral borders, forming one bone, which was correspondingly broadened. There 

 was only one nail which was notched in the middle of its free border. MUIR, J. 

 S., Gla* ; ioic .Mi'd. Jour., 18s 1, X. s. xxi. p. 4:20, Plate. 



Case of each extremity with double pollex or haling and re dim'-ntu r>t 

 digit attached to minimus. 



517. Female infant having thumb of each hand double, the two sets of bones lyiug in 

 the same skin and connective tissue. In the right hand the nails and phalanges of 



were quite distinct, but it was not certain whether the rnetacarpals \\en 

 separate or not. In the left hand the nails \\vro not completely separate and the 

 phalanges of the two thumbs were less distinctly separate. To the first phalanx of 

 the little finger of each hand was appended a rudimentary bud-like finger, hanging 

 by a peduncle. 



The lent resembled the hands. From the inner border of the metatarsal of each 

 great toe there proceeded a well-formed thumb-like toe with two phalanges. This 

 toe was set at right angles to the great toe and could be tlexed and to some extent 

 opposed. On the external border of the right foot there was a small extra little toe 

 hanging by a peduncle from the metacarpal V. In the left foot the supernumerary 

 little toe was bound up with the normal little toe for its whole length. HAGEXBACH, 

 E., Jiiltrh.f. Kinderlieilk., xiv. 187'J, p. 234, //>-. [Cp. No. 514.] 



1 Compare with the- largely similar series of phenomena seen in the foot of the 

 Dorking fowl (r. ///mi). But in it if the two hallucal digits are not a true pair it is 

 most commonly the ///,/ that is the largest, conversely, to the general rule in 

 the extra digits arising from the pollex in Man. 



