1903.] THE MUSCLES OF THE UNGULATA, 293 



presence of the flexor brevis digitorum manus, they have little in 

 common. 



The following are some of the myological characteristics of 

 the different families of Ungulata, but they will be better 

 appreciated by referring to the table : — 



HiPPOPOTAMIDiE. 



1. Posterior belly of digastric often wanting. 



2. Sterno-masseteric absent or very feeble. 



3. Well-developed rhomboideus capitis. 



4. Well- developed sterno-scapularis. 



5. Ooraco-brachialis entirely absent or only the longus present. 



6. Supinator longus sometimes present. 



7. Peroneus quinti digiti present. 



8. Soleus absent. 



9. Flexor brevis digitorum pedis fleshy. 



10. One lumbrical present. 



11. Tibialis posticus present. 



SuiD^. 



1. Sterno-facialis is superficial to platysma. 



2. Posterior belly of digastric often absent. 



3. Hyoideus transversus absent. 



4. Sterno-thyroid often double. 



5. Omo-hyoid may or may not have a posterior belly. 



6. Sterno-masseteric absent. 



7. Dorsoepitrochlearis from axillary border of scapula. 



8. Rhomboideus capitis present. 



9. Sterno-scapularis present. 



10. Subglenoid muscle occasionally present. 



11. Coraco-brachialis medius present. 



12. Palmaris longus absent. 



13. Supinator longus absent. 



14. Extensor profundus digitorum sometimes present. 



15. Obturator internus rises outside pelvis. 



16. Obturator tertius present. 



17. Peroneus quinti digiti present. 



18. Soleus absent. 



19. Tibialis posticus present. 



Camelid^. 



1 . Sterno-mastoid has an insertion into the angle of the jaw. 



2. Rhomboideus capitis absent. 



3. Coraco-brachialis medius apparently present. 



4. Palmaris longus absent. 



5. Supinator longus absent. 



6. Peroneus quinti digiti absent. 



7. Tibialis posticus very large. 



8. Splenius colli absent. 



