IV CONTENTS 



No. 4. APRIL, 1921 



HUBBS, CARL L. The Ecology and Life-History of Amphigo- 

 nopterus Aurora and of Other Viviparous Perches of 

 California . 181 



ALLEN,. WILLIAM RAY. Studies of the Biology of Freshwater 



Mussels 210 



No. 5. MAY, 1921 



HARRIS, J. A., AND REED, H. S. Inter-Periodic Correlation 



in the Analysis of Growth 243 



SCHRADER, FRANZ. The Chromosomes of Pseudococcus 



Nipa 259 



JUDAY, CHANCY. Observations on the Larvce of Corethra 



Punctipennis Say 271 



No. 6. JUNE, 1921 



THOMAS, L. J. Morphology and Orientation of the Otocysts of 



Gonionemus 287 



'BRUES, CHARLES T., AND GLASER, RUDOLF W. A Symbiotic 

 Fungus Occurring in the Fat-Body of Pulvinaria in- 

 numerabilis Rath 299 



RICHARDS, A., AND THOMPSON, JAMES T. The Migration of 



the Primary Sex-Cells of Fundulus heteroclitus 325 



HONDA, H. Spermatogenesis of Aphids ; The Fate of the 



Smaller Secondary Spermatocyte 349 



