50 ß- J- Anderson, 



The breadth of the 5*^ ribs at a point 12 cm. above the lower end 

 is 40 mm. This is the widest part of the rib. The fourth measures 

 at its widest part 35 mm. and the 6*^ the same, above and below the 

 ribs are narrower. 



Phacochaerus Ethiopicus. 



The first rib in Phacochaerus (PI. Ill fig. 7) is nearly straight 130 

 mm. long, 25 mm. wide at the lower end and 15 mm. at a distance 

 of 8 cm. from the lower end. 



The second rib measures 180 mm. in length and gives 8 mm. at 

 the lower end and 18 mm. at a distance of 7 cm. from the lower end. 

 The breadth diminishes as the rib is traced upwards from this point 

 so that at a distance of 12 cm. from the lower end. The rib measures 

 15 mm. the second rib has a concave posterior border and a convex 

 anterior. The anterior margins is thin and the posterior thick. 



The third rib measures 205 mm. in length 8 mm. at the lower 

 end and becomes gradually wider as we trace it upwards, so that at 

 6 cm., the breadth is 18 mm. and at 10 cm. The breadth is 23 mm. 

 The rib then diminishes gradually as we trace it upwards beyond the 

 latter point and measures 15 mm. at a distance of 2 cm. below the 

 tubercle. 



The anterior margin of the third rib is convex and the posterior 

 concave and thick. The anterior convexity is more marked than the 

 posterior concavity. 



The fourth rib measures 10 mm. as the lower end and at a dis- 

 tance of 11 cm. measures 31 mm. in breadth at 4 cm. the breadth is 

 18 mm. at 8 cm. 26 mm, at 14 cm. 25 mm. The fourth rib gains in 

 radial breadth beyond this point, the anterior margin is convex and 

 the posterior nearly straight and thicker than the anterior margine. 

 The posterior border of the 4*^ is thinner than that of the third and 

 the latter than that of the 2"^. The length is 240 mm. 



The fifth rib is 10 mm. broad at the lower extremity at 4 cm. 

 15 mm., at 7 cm. 23 mm., at 12 cm. 20 mm., at 16 cm. 17 mm. The 

 posterior border runs nearly straight from the angle to a point 4 cm. 

 from the anterior extremity. It then becomes convex. The anterior 



