114 PHYSIOLOGICAL SERIES. 



subhyoid arch. The anterior bellies arise from the anterior 

 margin of the arch and radiate from it as a single sheet to 

 the mandibles. 0. C. 64 M b c. 



Parsons, Jour. Anat. & Phys., vol. xxxii. 3898, p. 438. 



C. 111. Left half of the head of an Orang-Outang (Simla saty- 

 rus), seen from the basal aspect. The depressor maxillae 

 inferioris (digastric) is represented only by the posterior 

 belly. It is inserted by tendon upon the inner surface of 

 the angle of the jaw. In many individuals traces of the 

 anterior belly have been observed. 0. C. 64 M c a. 



C. 112. Depressor maxillee inferioris (digastric) muscles of a 

 Chimpanzee (Anthropopithecus troglodytes}. The general 

 arrangement is very similar to Cynopitliecus (C. 110). 

 The central tendon perforates the tendon of attachment 

 of the stylohyoid. 0. C. 64 M c b. 



Trunk. 



C. 113. Transverse section through the caudal region of a Dog- 

 fish (Rcyllium catulus). In consequence of the complicated 

 course and shape of each myotome, a large number of 

 them are cut through in a single section. The concentric 

 rings upon the section surface are the result of a series 

 of hollow conical projections from the anterior face of each 

 myotome, lying one within another and separated from 

 each other by the intermuscular septa of fibrous tissue. 

 O.C. 63 B. 



C. 114. Part of the vertebral column of a Mackerel (Scomber 

 scomber) , with a single myotome attached to the left side. 

 The fibres of the myotome run longitudinally, attached by 

 either end to a fibrous intermuscular septum that traverses 

 the body in a dorso-ventral direction and is attached to 

 vertebral column and superficial trunk-fascia in the form of 

 a W with the base directed backwards. The median part 

 of the myotome (i. e. the middle bend of the W) is pro- 

 longed forwards, above and below the mid-lateral line to 



