54 



E. J. Anderson, 

 Cervus tarandus. 



Ribs. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



Breadths at 

 lower end. 



30 



18 



23 



22 



25 



25 



18 



12 



12 



18 



14 



11 



9 



10 



Breadth 

 at angle. 



15 



15 



~ 



— 



— 



— 



19(r) 



10 



— 



— 





— 



— 



— 



Greatest 

 breadths. 



30 



20 



20 



27 



27 



26 



23 



15 



14 



17 



14 



14 



15 



16 



Distance of 



broad part from 



lower end. 



— 



50 



.3 d. 



5 

 « 



70 



70 



50 



40 



110 



110 



— 



80 



70 



50 



50 



The 4^" rib is flat in the lower half and thicker along a line 

 running along the anterior border. 



The groove on the anterior past of the 10*'^ rib reaches farther 

 down that the grooves on the ribs before and behind this point. 



The Dolphin. (Delphinus). 





1 



2 



3 



4 



5 



6 



7 



_.L 



9 



10 



11 



12 



13 



A 



160 



210 



270 



390 



310 



330 



330 



335 



340 



320 



300 



270 



250 



B 



70 



75 



83 



90 



110 





— 



— 



— 



— 



— 



— 



— 



C 



11 



17 



12 



14 



15 



9 



7 



8 



4 



4 



4 



3 



3 



D 



23 r 



17 



12 



14 



15 



9 



7 



10 



9 



9 



9 



8 



8 



E 



23x3 



17x5 



11x5 



11x6 



10x4 



10x4 



10x5 



10x5 



8x5 



8x4 



5x5 



5x5 



4x4 



E gives two measurements the first is the radial breadth and the 

 second the tangential, we see that, in the dolphin, the ribs give larger 

 radial diameters in the upper thirds and larger tangential diameters 

 in the lower thirds. The middle thirds are rounded. The sixth rib 

 gives 170 mm. for the lower flattening and 90 mm. for the upper 

 leaving 90 mm. rounded. The lower flattening reaches farther up- 

 wards in the anterior part of the thorax than in the posterior. And 

 the upper antero-posterior compression extends lower down in the 

 posterior ribs. 



In Delphinus Acutus. The first rib is uniformly broad 17 mm. at 

 the anterior end 160 mm. long and the extremity is hollowed. The 

 second is 20 mm. at the broadest place. The tJiird 15 mm., 4"^ 15, 

 6*"^ 15. Behind the sixth the lower end of the ribs have large tangential 

 diameters, and these are nearly equal to the radial diameters above. 



