ANATOMY OF MEGAPTERA LONGIMANA. 



177 



Table II. Measurements of the Mandible, 

 given in inches. 



Megaptera, B. musculus, 

 40 feet long. 50 feet long. 



*7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 



17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 26. 



27. 

 28. 

 29. 



30. 

 31. 



Length, in a straight line, 



along curve, on outer side, 

 Depth of curve, . • • • 



Height, at 6 inches from symphysis, 

 ,, at middle, 



at 12 inches from tip of coronoid, 

 ]', at coronoid (body and process), . 

 Coronoid process, height behind, 

 ,, height in front, 



breadth at base, 



,, at mid-height, 



'' thickness at middle, . 



From to']') of coronoid to top of condyle, . 



to end of condyle. 

 Greatest depth of neck, . • , ' ^ ' 



End of condyle to anterior edge of dental fora- 

 men, . . • ,• , f ■ • . ■ 

 From same edge of foramen to back ot coronoid. 

 Height at anterior fourth of neck, 

 ,, at middle of neck, 

 ,, at posterior fourth of neck. 

 Condyle, height (entire end of bone), 



,, thickness, at middle, . _ . 

 Thickness of mandible, near symphysis, 

 at middle, 



below coronoid ]irocess, . 

 at middle of neck, 

 For Rdation of MandihU to Skull. 

 From middle of glenoid fossa to end of beak. 

 From lower part of ditto to ditto. 

 Middle of glenoid fossa to vertical plane of 



anterior edge of temporal passage, . 

 Ditto to anterior border of floor of orbit, 

 Projection of mandible beyond beak when con- 

 dyle is in contact with middle of glenoid fossa, 



120f 

 130| 



171 

 6i 



10 



11 



12f 



H 

 H 

 7^ 

 31 



U 

 22 

 25 



2f 



llf 

 9 

 q3 



73 

 '4 



11 



6 

 4 



5 



6h 



5 



117 

 l'J(H 



8 

 16 



135 

 143 

 17f 

 7 

 9 

 12 

 17 

 8i 

 4i 



-■-8 



22 

 25 



16 

 4 



H 

 8f 



H 



7 



34 



5| 



54 



44 



137 

 140 



14 



27 



2 short 



25. Characters of the Mandible in comparison with those 

 OF B. Musculus. 



Coronoid Process.— [In B. musculus the coronoid process is high 

 (81 inches behind, 41 in front) and curved forwards. The anterior 

 margin has a concavity of about 1 inch deep; the posterior margin is 

 very convex on its upper half, concave (concavity i inch deep) on its 

 lower half The inner surface is nearly flat ; the outer surface is 

 concave vertically. The process is moderately everted on its upper 

 half but mainly owing to the concavity of its outer surface. Ihe 

 outer surface has a strong beam, marking off" the anterior third as 

 a deep groove on the upper third of the process, large enough to 



