984 THE OSTEOLOGY AND MYOLOGY OP THE DEATH ADDER, 



Fig. 15. — The masseter has been removed from the venom gland, and the 

 parieto-mandibular {P.M.) is displayed, as also is the anterior 

 temporal {A.T.); the lachrymal gland {L.G.) is seen. (V.D.) 

 venom duct. 



Fig. 16. — The venom gland has been removed. The slender parieto-max- 

 illary is seen, and the attachment of the anterior temporal to the 

 lower jaw. The posterior temporal has been reflected, and the 

 external pterygoid displayed. The parieto-pterygoid {P.Pt.) is also 

 seen, and the insertion of the internal pterygoid on the transverse 

 bone. 



Fig. 17. — The temporal muscles have been removed, and the whole of the 

 lower jaw. The parieto-mandibular is seen springing from the 

 prominent process of the parietal. The parieto-pterygoid {P.Pt.) 

 and spheno- pterygoid are seen attached to the pterygoid bone. 

 5", 5'" branches of the fifth nerve emerging from the foramen 

 ovale. {Q.B.) portion of the quadrate bone. 



Fig. 18. — The parieto-pterygoid and spheno-pterygoid muscles have been 

 removed, and the parieto-palatine displayed. {S.O.A.) the sub- 

 occipito- articular (Duges). {L.D.) longissimus dorsi attached to 

 skull. {S.L.) sacro-lumbalis attached to basioccipital. {B.C. A.) 

 rectus capitis anticus attached to basioccipital and exoccipital 

 bones. 



Fig. 19. — Inferior surface of the head. On the right side of figure the 

 mylohyoid has been removed, and the membrane lining the floor 

 of the mouth is shown. ( 7^. C.) trachea. Anteriorly portion of the 

 intermandibularis is removed; the lingual gland (Z-. 6?.) with its 

 band of muscle is seen. The attachments of the genio-hyoglossus 

 and genio-trachealis are also seen. The genio-hyoglossus is sho-WTi 

 to have a bifurcated attachment ; one tendon being attached to 

 the tendon of the intermandibularis in the midline ; while the 

 other is inserted into the inner side of the dentary. The attach- 

 ment of the cerato-mandibularis has been cut ; it runs forward and 

 joins the tendon of the intermandibularis ; posteriorly it lies along 

 the lower jaw. The mylohyoid {M.H.) is seen to be attached to 

 the bony hyoid {H.) internally, while anteriorly it is attached to 

 the lower jaw. {T.I. — T.I.) are the tendinous intersections which 

 represent ceratohyal and hypohyal {Tl.), and the first branchial 

 bar (J"). The portion {H.) represents the hypobranchial portion of 

 the hyoid. {G.H.) are the genio-hyoid muscles arising posteriorly 

 from the hyoid bars. {J.H.) the junction of the hyoid bars (basi- 

 hyal plate). 



