1872. 



MR. A. SANDERS ON LIOLEPTS BELLI. 



15J 



appears to represent one of the superficial mandibular muscles of 

 Serpents, of which Duvernoy* mentions three. 



Fig. 2. 



Superficial muscles on the side of head and thorax. 



Temporalis (figs. 2 & 4) arises behind from the anterior surface 

 of the os quadratum, above from the under surface of the poste- 

 rior frontal and squamosal, also from the outer extremity of the 

 parietal; it projects beneath this apophysis, forming a muscular 

 prominence above the rectus posticus major in the neck, deriving 

 some fibres from the posterior surface of the parietal and from the 

 upper surface of the exoccipital ; the fibres pass forward and down- 

 ward, and are inserted into the posterior edge and outer surface of the 

 coronary and into the same surface of the dentary, descending as far 

 as the inferior border, in front of the ectopterygoid, also into the 

 outer and inner surfaces of the supraangular and angular elements 

 of the mandible. 



Ectopterygoid (figs. 2 & 3) arises from the outer or lower surface 

 of the pterygoid bone, tendinous from the anterior portion, fleshy 

 from the posterior ; it encloses the posterior portion of the mandible 

 in a fleshy mass, being inserted into the supraangular, angular, and 

 articular elements. 



Entopterygoid (figs. 3 & 4) arises from the external concave 

 border of the parietal, appearing at the vertex internal to the tem- 

 poral muscle ; it has also an attachment to the prootic ; it is inserted 

 into the lower border of the internal surface of the mandible behind 

 the complementary element and immediately above the smooth space 

 for the ectopterygoid. 



The muscle internal to this, which corresponds to the two muscles 

 in Gecko which I fancied represented the tensor tympani, here 

 arises from the columella, from the membrane covering the anterior 

 part of the brain (alisphenoid), and from the anterior and upper 

 point of the prootic, and is inserted into the inner surface of the pos- 

 * Annales des Sciences Naturelles. torn. sxvi. 



