86 THE SKELETON OF THE CAT. 



bears dorsad, a short distance from its proximal end, a smooth 

 tubercle, and ventrad a small convex facet. Both articulate 

 with facets on the lateral surface of the third metatarsal. The 

 lateral surface has a sinuous facet along its dorsal border, and 

 ventrad of this a depression. There is a second facet along 

 the ventral border. Both facets are for the fifth metatarsal, 

 and the depression is for ligaments. 



The fifth ( 5 ) has its base flattened and expanded so as to 

 be wedge-shaped, with the apex of the wedge directed proxi- 

 mad. Its dorsal end extends into a tubercle. It thus presents 

 only lateral and medial surfaces. The medial surface shows 

 two tubercles, one distad of the other. The distal tubercle 

 and the distal half of the proximal tubercle are facetted and fit 

 into the sinuous facet on the fourth metatarsal. A narrow 

 facet on the ventral border of the surface articulates with the 

 facet on the ventral border of the lateral surface of the fourth 

 metatarsal. The proximal half of the distal tubercle is facetted 

 for the cuboid (c). The lateral surface is smooth, non-articular, 

 and obliquely grooved. 



PJialanges (Fig. 58, z, j, k}. There are three phalanges 

 in each of the four digits, and these are almost identical with 

 those described for the manus. 



Sesamoid Bones. Ossa scsamoidea (Fig. 58, /). The 

 sesamoid bones are found at the joints between the metatarsals 

 and phalanges, and are in all respects like those of the manus. 



JOINTS AND LIGAMENTS OF THE PELVIC LIMBS. 



Ligaments of the Pelvis. The ilium and sacrum are articu- 

 lated at the auricular facet of the ilium and the corresponding 

 rough surface of the sacrum. The joint is an amphiarthrosis, per- 

 mitting very little movement. A capsular ligament surrounds 

 the articular surface, being attached to the bones about its circum- 

 ference ; it is short and strong. Craniad of the capsule is a thick 

 very short ligament, composed of very strong transverse fibres 

 passing from the rough surface of the sacrum to the correspond- 

 ing rough surface of the ilium. This forms the lateral iliosacral 

 ligament, which is united at its caudal border to the capsule. 



A strong, wide ligamentous band passes from the dorsal 



