CONTENTS OF VOLUME XXXVIII. 



No. i. JANUARY, 1920. 



REIGHARD, JACOB. The Breeding Behavior of the Suckers 



and Minnows I 



STRONG, LEONELL C. Roughoid, A Mutant Located to the 

 Left of Sepia in the Chromosome of Drosophila melano- 

 gaster 33 



No. 2. FEBRUARY, 1920. 



HESS, WALTER N. Notes on the Biology of Some Common 



LampyridcB 39 



DAWSON, A. B. An Exception to Bateson's Rule of Secondary 



Symmetry 77 



SHAFFER, E. L. A Comparative Study of the Chromosomes of 



Lachnosterna (Coleoptera) 83 



No. 3. MARCH, 1920. 



ROBBINS, H. L. AND CHILD, C. M. Carbon Dioxide Produc- 

 tion in Relation to Regeneration in Planaria dorotocephala 103 



BALDWIN, FRANCIS M. Susceptible and Resistant Phases of 

 the Dividing Sea-Urchin Egg when subjected to Various 

 Concentrations of Lipoid- Soluble Substances, especially 

 the Higher Alcohols 123 



BERRY, S. STILLMAN. Light Production in Cephalopods, I . . 141 



No. 4. APRIL, 1920. 



BERRY, S. STILLMAN. Light Production in Cephalopods, II. 171 

 GOODRICH, H. B. Rapidity of Activation in the Fertilization 



of Nereis 1 96 



DANCHAKOFF, VERA. Immunity and the Power of Digestion. 202 

 HARMAN, MARY T. Chromosome Studies in Tettigidae. II. 

 Chromosomes of Paratettix BB and CC and their Hybrid 

 BC 213 



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