At'THOU S ABSTRACT OF T'lIS PAPER ISHrKD 

 BY THE BII L OGRAPHIC SERVICE, MAY 22 



CYTOPLASMIC INCLt^SIONS IN THE EGG OF 

 ECHINARACHNIUS PARMA 



HOPE HIBBARD 

 Bryn Maivr College 



ONE TEXT FIGURE AND FOUR PLATES (tWENTY-FOUR FIGURES) 



CONTENTS 



Introduction 467 



Preparation of material 469 



Observations 472 



A. Deutoplasmic inclusions 473 



1. Fat 473 



2. Glycogen 475 



3. Nutritive plates (yolk) . . 475 



B. Living inclusions 477 



1 Mitochondria 477 



C. Precipitations 479 



Discussion 481 



Summary 483 



Bibliography 484 



INTRODUCTION 



The cytoplasm of the egg has attracted a great deal of atten- 

 tion among cytologists during the last few years, in contrast to 

 the almost universal attention paid to the nucleus before that 

 time. A great many observations on cytoplasmic inclusions 

 have been made, but there is a distinct lack of coordination of 

 the results of such work. Cowdry, in his valuable contribution 

 to the literature on mitochondria, has summed up and correlated 

 the observations and conclusions of various authors regarding 

 these structures. Numerous other bodies occurring in the cyto- 

 plasm have been reported, but usually investigators have given 

 merely a description of the morphology and staining reactions 

 of these bodies. There have been, however, attempts to con- 

 sider cytoplasmic inclusions in the light of the physiology of the 



467 



JOURNAL OF N.ORPHOLOGY, VOL. 36, NO. 3 



