262 MR. ST.GEORGE MIVART ON © [Apr. 22, 
its fellow of the opposite side, a thin transverse sheet of muscular 
fibres immediately beneath the skin. It springs from the inner surface 
of the lower margin of the mandible, almost as far backwards as the 
articulation of the latter with the suspensorium. Its fibres incline 
slightly backwards; and a sort of faint linea alba is interposed 
between it and its fellow of the opposite side. 
The mylo-hyoideus posterior (figs. 1, 2, & 3, M. H. 2), with its 
fellow, forms another thin transverse sheet of muscular fibres placed 
immediately beneath the skin, except where the mylo-hyoideus 
anterior is superficial to it. It springs from the dorsal fascia and 
from that over the cornu of the hyoid, and covers the hinder portion 
of the digastric and part of the levator areuum. 
Submentalis (fig. 2, S.M). This small, azygos, transverse muscle 
connects together the anterior ends of the two mandibular rami. It 
is placed immediately above the most anterior portions of the mylo- 
hyoidei anteriores, and is much connected with them and with the 
genio-hyoidei. 
LAS. 
Tx. O: 
In. 
BAe) ‘ Pat. B 
Deeper muscles of right side, the mylo-hyotdei, the trapezius, and the 
latissimus dorsi being removed or cut short. 
A. A, Adductor arcuum. C. A, Constrictor areuum. C.F. Constrictor faucium.- 
C. H. E. Cerato-hyoideus externus. (C,H. Z. Cerato-hyoideus internus. D. 
Deltoid. D.1& D.2. Digastric. Ex, O. External oblique. G.H. Genio- 
hyoideus. Jn. O. Internal oblique. L.A. S. Levator anguli scapule. 
L. D. Watissimus dorsi. MM. Masseter. SS. Subclavius. S.M/. Serratus 
magnus. 7. Trapezius. 
Constrictor faucium* (figs. 2, 3, and 5, C. F). This muscle 
springs from the under surface of the dorsal segment of the second 
branchial arch (i.e. the second after the hyoidean cornu), and is 
inserted into a fascia beneath the throat, into which the genio-hyoid 
of the same side is also inserted. As the constrictor faucium passes 
downwards it is overlapped (and strapped in, as it were) by the 
band-like constrictor arcuum. 
The constrictor pharyngis is a delicate muscular sheet arising 
* Constrictor faucium internus of Schmidt, &c., see /. c. p. 29, and pl. 6. 
fig. xiii. 4, 
