%4t ON THE ANATOMY OF THE 



in animals, where the antagonist muscles, the tem- 

 poralis and masseter, are so powerful. 



On removing the digastric muscle, the peculiar 

 shape of the mylo-hyoideus is perceived. It is not 

 composed of two sets of fibres uniting in the centre 

 of the jaw, and filling up the space between the 

 sides to the chin, as in man ; but has a single set 

 of very delicate fibres crossing the jaw, and leaving 

 a space an inch in width, between the symphysis 

 menti, and the anterior edge of the muscle. This 

 edge is slightly concave, and bordered by most de- 

 licate tendinous film. 



The small muscles about the thyroid, arytenoid 

 and cricoid cartilages, do not sensibly differ from 

 those of man. 



The sterno-eleido-mastoideus, resembles the hu- 

 man, except in being inserted into the pars petrosa. 

 The sterno-hyoideus and thyroideus, the omo-hyoi- 

 deus, the longus colli, and the three scaleni, are 

 quite similar, as is the levator scapulae ; but the 

 latter is assisted in its action by a muscle not ob- 

 served in man, which Tyson has judiciously named 

 Elevator claviculse. It arises from the transverse 

 processes of the second and third vertebra, and is 

 broadly inserted into the outer end of the clavicle. 

 A muscle of the same kind was observed in the ba- 

 boon, and seems to be generally found in quadru- 

 peds. 



The pectoral muscles are much less fleshy than 

 in man ; and the P* major does not descend so low 



