16 SOLENODON PARADOXUS. 
Temporalis (Plate 5, fig. 1, e) is large, and arises along the median and 
parietal crests. Its main mass on the dorso-lateral surface of the skull is about _ 
40 mm. long and 20 mm. broad. It passes ventro-laterally to a tendinous 
insertion at the tip of the coronoid process of the jaw and on its ental aspect. 
A small muscle (Plate 5, fig. 1, d) arises from the lateral surface of the 
posterior zygomatic root and passes dorsal to the masseter as a narrow band 
some 5 mm. wide, to its insertion along the exterior base of the coronoid process 
for a distance of about 8 mm. This seems to correspond to what Dobson con- 
siders in Gymnura a second head of the temporalis. In Solenodon, however, 
it is quite separate from the temporalis throughout. 
Another muscle, corresponding to Dobson’s third head of the temporalis in 
Gymunura, arises much as in that form from the inner dorsal margin of the pos- 
terior zygoma, and curving downward and forward, is broadly inserted as a flat 
muscle in the hollow of the exterior face of the coronoid process. 
The masseter originates along the posterior portion of the malar part of the 
zygoma for a distance of 7 mm., and is inserted along the postero-ventral surface 
of the ramus. 
The digastric muscles (Plate 5, fig. 1, f) are rather small, arising along the 
inferior side of the lambdoid crests about a centimeter from the vertex of the 
skull. Each as it passes forward, tapers to a tendinous insertion at the tip 
of a small bony process on the inner ventral margin of the mandible about 13 
mm. anterior to the angle of the jaw. 
Pterygoideus internus is a short thickish sheet of muscle arising externally to 
the pterygoid on each side and inserting at the angle of the ramus. 
Pterygoideus externus is smaller, and arises just externally to the last from 
the sphenoid region. It inserts on the lower jaw inside the neck of the mandibu- 
lar condyle forward to the inferior dental foramen. 
The mylo-hyoid arises as a thin sheet from the inner ventral margin of 
each ramus. There is a fairly well defined median raphe where the two elements, 
one from each side, are united. The fibers stretch across between the two rami, 
and posteriorly to the insertion at the antero-ventral margin of the basi-hyal. 
A deeper and a more superficial layer is with some difficulty to be distinguished 
in this muscle. 
The stylo-hyoid is well developed and conspicuous. It is a narrow band 
arising from the ventral side of the mastoid process, and passing superficially 
to the digastric, is inserted on the side of the thyroid bone of the larynx. 
This muscle seems not to have been previously found in Solenodon. It is said 
