lilOLOGICAL BULLETIN, VOL. XXIII. 



PLATE I 



60 



St 

 56 

 S4 

 S2 

 SO 

 4S 

 46 

 44 

 42. 

 4o 

 38 

 36 

 34 

 31 



it 

 2.4 

 Zi 

 20 

 18 

 16 

 14- 

 II 

 10 



Z.O 



XS i6 17 18 2.9 30 31 31 33 54 3$ ib 37 38 39 4o 



FLORENCE A. WATTERS. 



