iv CONTENTS OF VOLUME XXV 



No. 5. OCTOBER, 1913. 



FAUST, E. C. Size Dimorphism in Adult Spermatozoa of Anasa 



tri.stis 287 



SCOTT, JOHN XX". Experiments icith Tapeworms. I. Some Factors 



Producing Evagination of a Cysticercus 304 



XX'AGNER, GEORGE. On a Peculiar Monstrosity in a Frog, 313 



WHITNEY, D. D. An Explanation of the Non-Production of 

 Fertilized Eggs by Adult Male-Producing Females in a 

 Species of Asplanchna 3 lS 



No. 6. NOVEMBER, 1913. 



WELLS, MORRIS M. The Resistance of Fishes to Different Con- 

 centrations and Combinations of Oxygen and Carbon Dioxide. 323 



TURNER, C. H. Behavior of the Common Roach (Periplaneta 



orientalis L.) on an Open Maze.. . 348 



