THE ANATOMY OF THE INDIAN ELEPHANT. 37 



muscles surrounding the opening of the mouth. The muscle is 

 farther strengthened by the addition of two muscular bundles, 

 which arise from the alveolar margin of the upper jaw, between 

 the tusk and molar tooth. Of these, the anterior passes down- 

 wards, and blends with the fibres of the zygomatico-labialis, 

 whilst the other, passing obliquely backwards, is inserted into 

 the ligament which gives attachment to the fibres of the bucci- 

 nator muscle in the interval between the upper and lower jaws. 

 The muscle is pierced by the duct of the parotid gland." 



Elevatoks of THE Hyoid Bone — Depressors of the 

 Mandible. 



Digastricus arises from the skull behind the articulation of the 

 stylo-hyal. The superficial portion is inserted directly into the 

 angle of the mandible; the deeper fibres into the posterior 

 border of the posterior process of the stylo-hyal, and continued 

 forwards by an equally strong muscular mass which arises from 

 the anterior border of the same process, and blends with the 

 superficial portion. 



C. and L.— 274-5 {q)- 276-7 {q); 287-8 {q); 292-3 {q). 



No tendinous intersection of digastricus, such as Mayer and 

 Watson describe, was found. 



Stylo-hyoideus may be represented by the deep fibres of 

 digastricus. 



Mylo-hyoidcus arises from the inner border of the mandibular 

 ramus, between the angle and the symphysis. It is inserted 

 into the lower border of the greater cornu of the hyoid bone, 

 and into the tendinous arch which crosses the thyro-hyoid mem- 

 brane; the anterior fibres blend with the muscle of the other 

 side. 



C. and L.— 287-8 (r) ; 292-3 (r). 



Genio-hyoidcus arises from the posterior surface of the mandi- 

 bular symphysis, and is inserted into the upper border of the 

 body of the hyoid bone. 



C. and L.— 281, fig. 2 {t^). 



The posterior part of mylo-hyoideus is covered by sterno-max- 

 illaris. Genio-hyoideus is seen when mylo-hyoideus is reflected. 

 Still deeper lie hyo-glossus minor and genio-glossus. The internal 



