116 ANNALS NEW YORK ACADEMY OF SCIENCES 



SOLENODON 

 Plate X, Figs. 3, 4 



The skull of Solenodon is remarkable for its degenerate zygomata, for 

 the great elongation of the muzzle, verticality of the enlarged anterior 

 incisor, small brain case with low sagittal crest, and sharply tritubercular 

 molars. 



MUSCLES OF THE ADDUCTOR OR TEMPORAL CROUP 

 (INNERVATED BY V 3 ) 



Masseter Pterygoideus internus 



Temporalis Digastricus (pars anterior) 



Pterygoideus externus 



MUSCLES OF THE DEPRESSOR OR DIGASTRIC CROUP 

 (INNERVATED BY VII) 



Digastricus (pars posterior) 



MUSCLES OF THE ADDUCTOR OR TEMPORAL CROUP 

 (INNERVATED BY V 3 ) 



Masseter. — A thick, heavy muscle arising on the zygomatic process of 

 the maxillary and from the fascia over the temporalis. It wraps around 

 the posterior angle of the jaw. 



Temporalis. — A large muscle arising in the temporal fossa and on the 

 squamosal. The insertion is on both the inner and outer surfaces of the 

 coronoid process. 



Pterygoideus externus. — A small muscle with a small origin on the 

 alisphenoid. Inserted on the inner side of the head of the condyle. The 

 muscle is slight, as the animal has a carnivorous dentition. 



Pterygoideus internus. — Arises in the pterygoid fossa and is inserted 

 on the inner side of the posterior angle of the mandible. 



MUSCLES OF THE DEPRESSOR OR DIGASTRIC GROUP 

 (INNERVATED BY VII) 



Digastricus (pars posterior) . — This is a large heavy muscle which arises 

 on the mastoid process and is inserted on a bony process on the lower 

 side of the mandible under the coronoid process. 



