454 MR. ST. GEORGE MIVART ON THE [June 24, 
The two appear to form but one, which arises in part (as has been 
said) from the dorsum of the pterygoid. 
Fig. 1. 
Superficial muscles of right side of head and of anterior part of trunk. 
0. H. E. Cerato-hyoideus externus. D.1. First part of digastric, L.A. Leva- 
tores arcuum. J. A.1. Most anterior part of the same. MM. Masseter. 
T. Temporalis. ‘ 
The masseter* (figs. 1, 2, & 3, M) is an exceedingly thick muscle, 
which is more or less divisible into a larger outer portion and a 
smaller inner part, the fibres being inserted into the tendon (which 
appears towards the lower part of the muscle) in a somewhat pen- 
niform manner. The muscle arises (between the temporal and 
digastric) from the antero-superior surface of the suspensorium, and is 
implanted, by its tendon, into the outer side of the mandible towards 
its upper border and in front of the insertion of the tendon of the 
temporalis. 
The digastric} (figs. 1, 2, & 3, D. 1 & D. 2) is also a considerable 
muscular mass, and springs trom different origins ; it is inserted by a 
strong tendon into the posterior extremity of the mandibular ramus. 
This strong tendon also connects the dorsal end of the hyoidean 
cornu with the posterior extremity of the mandible. 
The muscle appears to me to consist of two parts. One of these 
springs from the outer surface of the suspensorium, the origin ex- 
* Fischer, ‘Anatomische Abhandlungen tiber die Perennibranchiaten und 
Derotremen’ (Hamburgh, 1864), p. 59, tab. iii. B. m. 
t Fischer, /. c. p. 50, tab. ili..B. dg’’. 
