DIGASTRIC. Ill 



by a weak tendinous intersection. The intersections of 

 opposite sides are united by a subbyoidean tendinous arcade, 

 which forms a base of origin for the anterior bellies. The 

 latter occupy the whole of the intermandibular space. 



C. 98. Skull of a Mole ( Talpa europcea] , showing the depressor 

 maxillae inferioris (digastric) muscles. They are of the 

 monogastric type, interrupted on a level with the angle 

 of the jaw by an extremely feeble tendinous intersection ; 

 they arise from the paroccipital region of the skull by a 

 largej fleshy origin and gradually taper to a fine tendon 

 attached to the middle of the mandible, and also by a few 

 fibres to the posterior margin of the mylohyoid. 



C. 99. Skull of Galeopithecus volans with depressor maxillae 

 inferioris (digastric) and mylohyoid muscles. The 

 depressors are monogastric with a feeble tendinous inter- 

 section. They are attached to the angles of the jaw. The 

 anterior part of the mylohyoid is intimately bound to the 

 geniohyoideus. 



C. 100. Occiput and lower jaw of a Hare (Lepus europcew}, 

 showing the depressor maxillae inferioris (digastric) muscles. 



In this family of Rodents the depressor is monogastric, 

 represented by the anterior belly alone ; the place of the 

 posterior belly is occupied by a long tendon attached to the 

 paroccipital process. 0. C. 64 z I b. 



Parsons, Jour. Anat. & Phys., vol. xxxii. 1898, p. 441. 



C. 101. Head of a Guinea-pig (Caviaporcellus), showing the mas- 

 seter and depressor maxillse inferioris (digastric) muscles. 

 The anterior and posterior bellies of the depressors are 

 separated from one another by a slightly constricted area 

 the surface of which is tendinous. The anterior bellies are 

 attached near the symphysis at either end of the trans- 

 versus mandibulse. 0. C. 64 z I c. 



Parsons, Jour. Anat. & Phys., vol. xxxii. 1898, p. 489. 



C. 102. Skull of Dasyprocta ayuti, with depressor maxillae 

 inferioris (digastric), mylohyoid, and hyo-epiglottidean 



