Measurements of ribs. 



43 



The entire depth of the chest is 365 mm. The ribs are round 

 in the middle and measure about 5 — 8 mm. in diameter. 



The diminution in the tangential breadths of the ribs in very 

 gradual, in the middle and upper ribs especially and one is reminded 

 of the condition in man. 



The anterior surface becomes internal in is the ribs behind the 

 tirst in the trombat. 



The Flying Lemur (Galeopithecus Volans). 



In Galeopithecus Volans (PI. II. Fig. 1) the second rib becomes 

 wider posteriorly. The flattening and widening becomes well marked 

 from the fifth to the last. The distance from the first dorsal vertebra 

 to the last is 12,ò cm. 



The following table gives the measurements. 



Nuhn ^) notes the great breadths of the ribs. 



1 



1 





3 



* 



5 



6 



7 



8 



9 



10 



11 



12 



13 



Â 



15 



28 



38 



46 



56 



60 



61 



63 



58 



50 



46 



40 



35 



B 



5 



17 



25 



30 



38 



.54 



50 



60 



50 











C 



3 



2 



2 



3 



3,5 



4 



4,5 



4 



4 



3 



4 



4 



3 



D 



4 



3 



4.5 



5 



5,5 



5 



6 



6 



« 



6 



6 



5 



4 



E 



4 



3 



4,5 



4 



5,5 



5 



6 



6 



6 



6 



6 



5 





F 



20 



22 



30 



35 



40 



30 



25 



30 



20 



30 



13 



8 





A = Length of rib from tubercle to lower end. 



B = Length of cartilage. 



C -= Breadth of rib at lower end. 



D = Breadth at widest part. 



E = Breadth at angle. 



F ■■ Distance of widest part from lower end. 



Lemur Macaco. 

 The increase of breadths at the angles is very marked. The 

 breadths decrease towards the anterior ends, where they become wide 

 again a .short distance above the lower end. 



M Anat. p. ÜJ4. 



