58 



ANATOMY OF VERTEBRATES. 



are short, as at a ; but elongate in succeeding vertebra;, i to e ; 



and usually at the eighth, 

 or ninth, fig. 49, /, 6, 

 {Lacerta), from the head 

 or tenth ( Varanus), they 

 are joined through the 

 medium of ossified ■ hasma- 

 pophyses to the ster- 

 num. Two( Varanus),\\\xt<i, 

 { Chameho, Ljuana), or four 

 ( Cyelodus), following ver- 

 tebra; are similarly com- 

 pleted; and then the ha3ma- 

 pophyses are either united 

 below without intervening 

 sternum ( Cliamdco), or two 

 or three of them are joined 

 by a common cartilage to 

 the cartilaginous end of 

 the sternmn. The ha?ma- 

 pophyses afterwards pro- 

 ject freely, and are reduced 

 to short appendages to 

 the pleurapophyses. These 

 also shorten, and sometimes 

 suddenly, as, e. g., after 

 the eighteenth vertebra iu 

 the Monitors ( Varanus), in 

 which they end at the 

 twenty-eighth vertebra, as 

 they began, viz., in the 

 form of short straight ap- 

 jiendages to the diapo- 

 physes. 



The Draco volans, fig. 

 50, is so called on accoimt 

 of the wing-like expansions 

 from the sides of its body, 

 su])j)ortcd, like the hood of 

 the coln'a, by slender elon- 

 gated ribs. In this little 

 li/.ard there arc twenty 

 liieh commence apparently 



^crtebrtc supporting moNalilc rib; 



