SKELETON OF THE CROCODILE. THE PES. 269 



(fibulare) (fig. 48, B, 1 6), is drawn out into a prominent posterior 

 process forming a heel such as is almost unknown elsewhere 

 except in mammals. It articulates with the fibula, the tibiale- 

 centrale, and distally with a bone representing the fourth and 

 fifth tarsalia, and with the fifth metatarsal. 



The two bones forming the distal row of tarsals are both 

 small and rounded ; one represents the first three tarsalia fused 

 together, the other tarsalia 4 and 5. 



The Foot. The foot has five digits, but the fifth is much 

 reduced, consisting only of a short metatarsal. The first four 

 metatarsals are all long bones, slightly expanded at each 

 end, and terminated by small epiphyses. The first digit has 

 two phalanges, the second three, the third four, and the fourth 

 five. The terminal or ungual phalanx in each instance is 

 grooved and pointed, and in the case of the first three digits 

 bears a horny claw. The ungual phalanx progressively de- 

 creases in size from the first to the fourth. The fifth digit 

 consists only of a small, somewhat square metatarsal (fig. 48, 

 B, 21), attached to the bone representing the fused fourth and 

 fifth tarsalia. 



