TOL. XLI, NO. 481 



JANUARY, 1907 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 DEVOTED TO THE NATURAL SCIENCES 

 IN THEIR WIDEST SENSE 



CONTENTS 



I. Hote on the Habits of Fierasfer .... PE0FES80R EDWIN LINTON 1 



n. Eecordi of Pennsylvania Fishes ...... HENEY W. FOWLEB 6 



in. Specific Name of Nectnrus maculosus .... PSOFESSOK F. C. WAITE 23 



IV- Volvox for laboratory nse BEETRAM G. SMITH 31 



V. Ostracoda from Southeastern Massachusetts .... J. A. CUSHMAN 35 

 VI. Notes and Literature: Physics, A First Course in Physics; Biology, Jennings' 

 Behavior of the Lower Organisms, Modernized Darwinism; Momentum 

 in Variation, Xenia in Wheat; Zoology. Folsom's Entomology, Observa- 

 tions on Hyla and Rana virgatipes; Zoological Laboratory Notes, 

 Notes; Boiany. Bergen and Davis's Principles of Botany, Rydberg's 



Flora of Colorado, Notes 41 



Vn. PublicationB received 67 



BOSTON, U. S. A. 

 GINN & COMPANY, PUBLISHERS 

 29 BEACON STREET 



Hew York Chicago London, W. 0. 



I Fifth Avenue 378-888 Wabaah Avenu* 9 St. Mutln's Street 



Entered at the Post-Office, ^ 



