40 ILLINOIS BIOLOGICAL MONOGRAPHS [210 



EXPLANATION OF PLATE 



HEXAGRAM MOS DECAGRAM MUS 



Fig. ir. Posterior view of skull. One and one-half times natural size. 

 Fig. 12. Lateral view of skull. One and one-half times natural size. 

 Fig. 13. Dorsal view of skull. One and one-half times natural size. 



