IV CONTENTS. 



AGERSBORG, H. P. KJERSCHOW. The Relation of the Madre- 

 porite to the Physiological Anterior End in the Tzventy- 

 Rayed Starfish, Pycnopodia helianthoidcs (Stiinpson) . . . 202 



No. 5. MAY, 1922 



CAMERON, A. T., AND O'DONOGHUE, C. H. Retinal Reflexes 

 of Narcotized Animals to Sudden Changes of Intensity 

 of Illumination 217 



GRAVE, B. H. An Analysis of the Spawning Habits and 



Spawning Stimuli of Chcctopleura apiculata (Say} 234 



AGERSBORG, H. P. KJERSCHOW. Notes on the Locomotion of 

 the Nudibranchiate Mollusk Dcndronotus gigantcus 

 O'Donoghue 257 



MORGAN, LILIAN V. Non-Criss-Cross Inheritance in Droso- 



pliila melanogaster 267 



No. 6. JUNE, 1922 



Twenty-Fourth Annual Report of the Marine Biological Labo- 

 ratory 275 



KOPEC, STEFAN. Studies on the Necessity of the Brain for 



the Inception of Insect Metamorphosis 323 



