PLATE XLV. 



Fig. 1. 

 Fig. 2. 



Balcenoptera borealis. 



Musculature of flipper, mesal view. 2f X natural size. 

 Skeleton of flipper, mesal view showing attachments of muscles. 



24 X natural size. 



1. M. rhomboideus. 



2. M. levator anguli scapula. 



3. M. omohyoideus. 



4. M. subscapularis. 



5. M. teres major. 



6. M. serratus anticus. 



7. M. supraspinatus. 



8. Processus coracoideus. 



9. M. coraco-brachialis. 



10. M. masto-humeralis. 



11. M. deltoideus. 



12. Mm. pectoralis and latissimus dorsi 



13. M. triceps. 



14. Ligamentous bands representative of biceps. 



15. M. flexor communis digitorum. 



16. M. flexor radialis. 



17. M. flexor ulnaris. 



