340 MEMSTIC VARIATION. [part i. 



Toulouse, 1838, p. 28. [Not seen by me. Abstract taken from D wight, 

 I.e., vide No. 492. Cp. p. 326, Xote.] 

 503. Girl, new-born, having the left foot "double," bearing eleven toes. 

 The left labium majus was twice as large as the right, and the left 

 leg and thigh were much thinner than the corresponding parts on the 

 right side [measurements given]. The extra parts were all on the planter 

 side of a foot which had toes of nearly normal shapes and sizes. This 

 foot was bent into a position of extreme talipes equino-varus, and the 

 great toe was bent so that it pointed inwards at right angles to. the 

 metatarsal. 



Upon the plantar side of this foot there was a series of six well- 

 formed, small toes, arranged in a series parallel to that of the 'normal' 

 five, and having their plantar surfaces in opposition to those of the 

 latter. Of the series of six toes that facing the normal little toe exactly 

 resembled it. The second was the longest of the six, but did not 

 resemble a great toe. The third and fourth were equal in length, the 

 fifth and sixth being shorter, as are the external toes of a normal foot. 

 None of the toes were webbed. Bull, G. J., Boston Med. and Sury. 

 Jour. 1875, xciii. p. 293, fig. [This figure copied by Ahlfeld. 

 Missb. d. Menschen, PI. xx. fig. 2.] 



[The case described by Graxdix, Amer. Jour, of Obstetrics, 1887, xx. p. 425, 

 Jig., is probably a case of a pair of limbs composing a Secondary Symmetry 

 attached to and deforming the limb belonging to the Primary Symmetry and 

 corresponding with that of the other side. The nature of this case will be better 

 understood when evidence as to the manner of constitution of Secondary Symmetries 

 has been given.] 



"504. Macacus sp. A monkey, full-grown, having nine toes on the 

 left foot ; right foot normal, upper extremities not preserved. The 

 specimen is described as No. 307 in the Catalogue of the Terato- 

 logical Series (1872) in the Mus. Coll. Surg. (Hunterian specimen). 

 Though I am disposed to agree in the main with the view of the 

 nature of the specimen given in the Catalogue it is not in my 

 judgment possible to decide confidently in favour of this view to 

 the exclusion of all others. For this reason the specimen is here 

 described afresh. This is the more necessary as the account of 

 the Catalogue is incorrect in some particulars. 



Extra parts are present in the limb and in the pelvic girdle. 

 (Figs. 97 and 98.) The names to be given to the parts depend on 

 the hypothesis of their nature which may be preferred. In general 

 terms it may be stated that the ventral or pubic border of the 

 girdle and the internal (tibial) border of the limb are nearly normal. 

 The external (fibular) border of the limb is also normal, but between 

 these there are in addition to the normal parts other structures, 

 whose true nature is somewhat uncertain. 



The appearances may be realized best in the following way. Sup- 

 pose that two similar left feet lie in succession to each other, the 

 " posterior " having its hallux next to the minimus of the "anterior/' 

 so that the digits read I, II, III, IV, V, I, II, III, IV, V. Now if 

 the two feet could interjDenetrate so far that the minimus of the 

 " anterior " foot took the place of the hallux of the " posterior," this 



