CONTENTS. v 



No. 4. -- December, 1897. 



PAGES 



I. JAMES E. PEA BODY. 



The Ampullae of Lorensini of the Sclachii . 163-178 



II. FRANK R. LILLIE and F. P. KNOWLTON. 



On the Effect of Temperature on the Develop- 

 ment of Animals 179-193 



III. A. L. TREAD WELL. 



TJie Cell Lineage of Podarke Ob sc lira. Pre- 

 liminary Communication 195-203 



IV. CHARLES W. HARGITT. 



Notes upon CordylopJwra Lacustris . . . 205-208 



V. ARNOLD GRAF, PH.D. 



Hirudinccn Stndicn. Preliminary Notice . 209-216 



No. 5. February, 1898. 



I. WILLIAM MORTON WHEELER. 



A New Gcnns of Dolichopodidae from 



Florida 217-220 



II. J. B. JOHNSTON. 



TJic Olfactory Lobes, Fore-Brain, and Habc- 



nnlar Tracts of Acipcnscr 221241 



III. MARGARET LEWIS. 



A Method of Removing Cuticnla from 



Marine Annelids 243 



IV. WM. A. REDENBAUGH. 



A Simple Method of Diluting Alcohol to 



any Desired Per Cent 245 



V. HERMON C. BUMPUS. 



The }\iriations and Mutations of (lie Intro- 

 duced Littorina 247-259 



