166 ME. II . G. SEELET ON OSSEOUS RESEMBLANCES 



of the centrum. After tlie first three vertebrae a hypapophysis 

 is developed, aud the neural spine becomes short, and stands be- 

 tween the posterior zygapophyses. So that the vertebral column 

 has little in common with the Crocodile's beyond a short neck, a 

 long tail, a sacrum of two vertebrae, and a procoelous centrum. 

 The transverse processes in the tail of the Crocodile are directed 

 outward and not downward, and the zygapophysial facets in the 

 tail of Crocodiles look upward and not inward. In the Chameleon 

 the neural spines are relatively small, and the chevron bones are 

 small and short. 



The principal part of the sternum has its lateral portions in- 

 clined to each other like the sides of a boat. The anterior pair of 

 the four sides (which make it diamond-shaped) give attachment to 

 the coracoids ; aud there is no episternal part prolonged between 

 those bones and anterior to them, as in a Crocodile. Only one 

 pair of sternal ribs are attached to the first part of the sternum, 

 two pairs to the second part, and one pair to the third part. 

 These characters, with the keel running down the sternum, are 

 the chief differences of this region from that of the Crocodile. 



The scapular arch similarly consists of scapula and coracoid ; 

 but the bones are not inclined to each other at the great angle 

 observable in the Crocodile. 



The coracoid is a compressed subquadrate bone, with the ante- 

 rior margin convex, and a posterior margin made by two conca- 

 vities, of which the superior one is completed above by the sca- 

 pula, and so forms the articulation for the humerus, which, instead 

 of looking outward and backward as in the Crocodile, looks directly 

 backward. The bone only resembles that of the Crocodile in 

 being similarly perforate in front of the articulation. The scapula 

 differs from that of. the Crocodile more in proportion than in 

 plan, being twice as long as the coracoid ; for the part of the 

 bone which in a Crocodile is thin, flattened, and expanded, is here 

 prolonged with the ribs as a flattened cylindrical bone, slightly 

 widening as it becomes more compressed towards the free end. The 

 Chameleon has no spine to the scapula like that in the Crocodile. 



The humerus in the Chameleon is relatively longer, straitcr, 

 more slender in the shaft, and more massive at the proximal and 

 distal ends ; the radial crest is more massive than in the Crocodile. 

 The distal end has two well-marked condyles, of which the outer 

 one is hemispherical ; immediately above the condyle is a depres- 

 sion in which a large vessel enters the bone. These features are 



