Measurement of ribs. 



57 



The third and fourth ribs viewed from tlie interior show a curve 

 with the convexity directed backwards. The tifth and sixth sliow a 

 double curve each half the size of the curve of the precedings and 

 with the convexity directed back. 



Behind tlie seventh the anteiior border of the ribs gets thicker 

 and the greatest breadths which are tangential are near the middle 

 of the rib. 



Phoea VittuUina. 





1 



2 



3 



4 



6|g 



7 



8 



9 



10 



11 



12 



13 



14 



15 



A 



50 



65 



100 



120 



130 



140 



155 



170 



180 185 190 



190 



180 



170 



145 



B 



, 6*^ 



70 



90 



100 !l20 



130 



140 



140 



150 170 



— 



— 



— 



— 



— 



C 



12x8 



8x10 



8x12 



9x14 13 



13 



14 



16 



16 17 



15 



12 



12 



10 



8 



D 



20 20 15 



15 15 



14 



15 



16 



16 



16 



20 



15 



15 



18 



15 



E 



20 



13 13 



13 ' 12 



12 



13 



13 



12 



10 



10 



10 



7 



7 



7 



F 



i 50 



65 



80 



100 



120 



150 



145 



150 



60 



170 



170 



170 



160 



160 



135 



The letters have the usual significations. First rib wider above 

 than below and the greatest diameter is the radial. A line drawn 

 from the lower end of the 1^' rib to the lower end of the last marks 

 the rounded middle parts of the ribs 



Radial breadths above and the tangential breadths below are the 

 greatest. The 10"' ribs are broader below. 



Pelagius Monachus. 

 The (J"', 7*^, 8"* and 9"* ribs are very strong and thick below. 





I 

 f.i 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



\ 



20 



20 



20 



22 



25 



22 



23 



23 



23 



23 



23 



22 



22 



23 



B 



20 



t— r 

 10x15 



t-r 

 15x15 



17 



18 



18 



19 



19 



19 



19 



15 



15 



15 



14 



12 



C 



12 



10 



10 



12 



9 



9 



9 



9 



9 



10 



10 



10 



13 



— 



— 



Â - liadial breaths at the tubercles. B » breadths at the ends. C = least breadths. 



The measurements are radial except in 2'"' and S""** where tangen- 

 tial and radial are both given. The least measurements of breadths 

 are i)*) mm. above the lower ends. The outer surfaces are wide at the 

 middle «-specially in the middle ribs. The outer surface of the second 

 measures ir> mm. near the middle. 



