534 



R. W. Hegner 



center of the amoeboid mass of cytoplasm in which it lies embedded ; 

 the whole apparently has moved en masse 10^73.16. the lighter end of 

 the egg. The pole-disc is situated between the vesicular layer and 

 the middle zone; it is probable that its change of position is due, 

 not to any movement of the granules, but to the accumulation of 

 lighter fats posterior to it. 



C.L. a, 2. The only redistribution of material that has 

 taken place since this egg was taken from the centrifugal machine 

 is a movement of the "Keimhautblastem," resulting in several 

 large accumulations at the periphery in the middle region. The 

 nuclei have disintegrated and the "Keimhautblastem" has the 

 vacuolated appearance indicative of its early dissolution. No 

 larva could possibly have developed from this egg. 



C.L. a, J. Sections of this egg show a continuation of the cata- 

 bolic processes mentioned in C. L. a, 2. 



C.L. a, ^. The only egg which was not fixed before the end 

 of the hatching period seems to have developed normally, as it 

 produced a normal larva. I can account for this only on the 

 assumption that the eggs of this series were differently affected 

 by the centrifugal force and that C.L. a, 2 and C.L. a, 3 were too 

 severely injured to continue their development while C.L. a, 4 was 

 able to readjust itself to the new conditions imposed by the change 

 in the position of the egg contents. A perfect series of sagittal 

 sections was made through this larva; they showed no irregularities 

 in the size, position or structure of the internal organs. The 

 reproductive organs (female) are in their proper positions. 



TABLE IX 

 CalUgrapha lunata — Series C.L.I. 



