1() SOLENODON PARADOXUS. 



Temporalis (Plate 5, fig. 1, e) is large, and arises along the median and 

 jxarietal crests. Its main mass on the dorso-Iateral 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 {masses dorsal to the masseter as a narrow band 

 some 5 mju. 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 Solenotlon, however, 

 it is quite separate from the tempcjralis throughout. 



Another muscle, corresponding to Dobson 's third head of the temporalis in 

 Gymnura, arises much as in that form from the inner dorsal margin of the pos- 

 terior zygoma, and curving downwartl and forward, is broadlj' 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 oi 7 mm., and is insei'ted along the postero-ventral surface 

 of the ramus. 



The digastric muscles (Plate 5, fig. 1,/) 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 

 nun. 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 extei'nus 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 



