PLATE 8 
Fig. 17. Sternum of Phrynosoma douglassi douglassi (Dept. Zool.). 
x 1h. 
Fig. 18. Sternum of Phrynosoma blainvillei blainvillei (Univ. Calif. 
Mus. Vert. Zool., no. 272). X 114. 
Fig. 19. Sternum of Phrynosoma platyrhinos (Uniy. Calif. Mus. Vert. 
Zool., no. 1301). X 1%. 
Fig. 20. Sternum of Anota maccalli (Uniy. Calif. Mus. Vert. Zool., 
no. 1006). * 1%. 
ABBREVIATIONS 
ist r., first rib. font., fontanelle. 
2nd r., second rib. stern., sternum. 
5rd r., third rib. xiph. rd., xiphoid rod. 
epist., episternum, 
