VOL. XLIII, NO. S06 



FEBRUARY, 1909 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Sciences with 

 f Special Reference to the Factors of Evolntion 



5 ; ' / ■■oeny— The Origin of the Archegoniates, Dr. Bbadlky M. Davis. 

 Moletkm^mt— Club's The Apodons Holothurians, W. K. Fisher. Lepi- 

 •'—'to— The Bine Bui ~ 

 X. Vertebrate J 

 loeanria • The Old 

 t-'d;s : .V.vt..-u(ir 



>-fires on Desert and LaVa,"br." RoTL.1 



-The Blue Butterflies oTtbe'Genu* Cdastrina.Prc 

 LL. Vertebrate Pale&rUoloau— The Lvsorophida : Stegocephala ; 

 losanria • The Oldest Know M \[> \ th- Gaakohle ; Bisc 



titahs; Nectosaurus ; Callibrachion, Dr. Roy L. MOODIK. Parewii 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, N. Y. 



NEW YORK : SUB-STATION 84 



