OLDEST LAND REPTILES OF NORTH AMERICA 



91 



pig is struck the arrow-head is pulled out, and the shaft, trailing along on 

 the ground quickly becomes entangled in the brush, making the cajiture of 

 the animal easy. The sticks (Figs. 9 and 9a) with the crook on one end 

 are used for capturing crabs among the rocks. Fig. 11 is a wooden fish 

 spear. It only remains to notice the two very curious sigmoid bows shown 

 in Figs. 7 and 8. The former is used by the tribes of North Andaman; 

 the latter by those of South and Middle Andaman. 



Charles W. Mead. 



FIG. I. SPINE^BACKED LIZARD DIMETRODON. 



From the Permian of Texas. Skeleton discovered by Dr. E. C. Case in 190B. 



THE OLDEST LAND REPTILES OF NORTH AMERICA. 



EIGHTEEN years ago, in 1S91, the American ]\Iu.seum began 

 to gather together its collections of the extinct C|uadrupe(Ls of 

 the Age of jMamnials, the ancestors and predecessors of the living 

 ([uadrupeds. Six years later, the scope of the work was enlarged so as 

 to include the animals of the Age of Reptiles, which preceded the Age 



