1901.] 



IHE MUSCLES OF THE U2TGULATA. 



669 



Ungulates except Hyrax (see text-fig. 88) 1 ; it rises from the 

 paramastoid and outer side of the base of the paroccipital pro- 

 cesses, aud is inserted into the posterior projection at the upper 

 end of the stylo-hyal bone. In the Horse (56, 57) the muscle 

 covers the outer side of the eustachian air-pouch. 



In the Camel (19), Thompson says that its fibres seem to be 

 continued into the stylo-pharyngeus muscle, but this we did not 

 notice in any other animal. 



The nerve-supply is the facial. 



Text-fig. 88. 



Hvoid muscles of the Duiker-bok. 



n \ Double Stylo-glossus. 



3. Stylo-pharyngeus. 



4. Stylo-hyoid. 



.">. Masto-stvloideus. 



0. Digastric (Depressor maadibuli). 



7. Stylo-hyal bone. 



8. Tympanic bone. 



9. Paroccipital process. 



Stylo-hyoid. — This muscle usually rises by tendon from the 

 posterior tuberosity at the upper end of the stylo-hyal, and runs 

 downward and forward to he inserted into the base of the cerate- 

 hyal. In the Hippopotamus, Gratiolet and Alix (TIT.) say that it 

 rises from the paramastoid process, and in Cuvier and Laurillard's 

 ]»late of this animal (I.) it apparently has the same origin. In 

 the Hyrax also we (68) agree with Mivart and Murie (67) that it 

 arises from the paramastoid process. It is always supplied by 

 the facial nerve, and we believe thai the masto-styloideus .is the 

 proximal part of this muscle, which is cut off by the projection of 

 the stylo-hyal bone so characteristic of most [Jugulates 

 text-Hg. 88). This belief is strengthened by the fad that in the 

 Hyracoidea, where the Btylo-hyoid rises from the paramastoid 

 process, the masto-styloideus is absent, and we await future in- 

 vestigation! of the muscles of this region of the Hippopotamus 

 with interest. Thompsons assertion thai Borne of the fibres of 

 the masto-styloideus sre continued into the ■tylo-pharyngeus in 



Wt 1 1 ; » v i definite account of it in the Hippopotamus. 



Paoc. Zool. Soc.— 1901, Vol. II. No. XL1V. M 



