342 



MERISTIC VARIATION. 



[part I. 



lacks the external (fibular) parts of a tarsus, viz. the cuboid and 

 calcaneum. There is a cuboid, cb, and a calcaneum, c, for the 

 " posterior " foot, but none for the " anterior." The bone c 3 might 

 of course be called a cuboid ; but if this is a cuboid there is no 

 ecto-cuneiform for the anterior foot. The account given in the 

 Catalogue avoids these difficulties by the statement that each foot 

 has three cuneiforms and a cuboid, declaring that there is a second 

 cuboid between the two sets of cuneiforms. This is nevertheless 

 incorrect, for the whole distal series in the tarsus contains only 

 seven bones and not eight. The mistake has no doubt arisen by 

 counting c s twice over. The Catalogue is also in error in neglecting 

 the fact that the tarsal articulation of the digit 2 is quite abnormal. 

 Similarly in the crus, there is no good reason to affirm that the 

 bone fib 1 is a fibula rather than a tibia. The Catalogue regards it 

 as a second tibia, but I incline to speak of it as the fibula of the 

 'anterior' foot following the view already indicated. As I have 

 said, the leg is almost normal in the structure of its external 

 border and almost normal in its posterior border, but between 

 these the nature of the parts is problematical. All that can be 

 done is to describe the parts as they are seen. 



Beginning at the external (fibular) border of the foot there is a 

 nearly normal series of three digits, 9, 8, 7, fashioned as V, IV and III 



S 1 f* 



I 



II 



Fig. 98. I. Innominate bone of Macacus, No. 504. i 1 , p, is 1 , t 1 , of 1 , ilium, 

 pubis, ischium, ischial tuberosity and obturator foramen of the supposed anterior 

 part of the girdle; the parts marked 2 being the corresponding structures of the 

 supposed posterior part. 



II. Details of tarsus of the same. Digits numbered 1 — 9 from the inside. 



A, astragalus, c, calcaneum. 

 " posterior " foot, cb, cuboid. 



n 1 , navicular of "anterior" foot. n' J , navicular of 

 c 3 — c 6 , six bones placed as cuneiforms. 



