66 



EXPLANATION OF PLATES 



a. 



la. 



la.s. 



a.d.o. 



an 



ant. 



b. 



b.c. 



ca.g. 



ex. 



e.g. 



ch. 



co.g. 

 d.p 



ec 



e.g.h 

 f.c 



g- 

 g.b. 

 i.p. 



k.c 



l.h 



large polynucleate cells of the 

 blastoderm. 



lateral groove. 



mandible. 



mesoderm. 



mesenteron. 



mouth. 



maxilla. 



middle plate. 



cleavage nucleus. 



nuclei of the cells. 



proctodseum. 



procephalic lobes. 



protoplasmic network. 



peripheral protoplasm. 



remains of large nucleus. 



serosa. 



scattered cells of the body cav- 

 ity. 



spiracle. 



stomodasum. 



supraoesophageal ganglion. 



suboesophageal ganglion. 



thickenings of the inner layer of 

 peripheral protoplasm. 



1st thoracic appendage. 



1st thoracic segment. 



vacuole. 



vitelline membrane. 



yolk mass. 



so-called yolk cells. 



yolk granules. 



Plate I 



Fig. 1. Longitudinal section through the egg of Camponotus 1 hour old. X 52. 

 Fig. 2. Large nucleus found in posterior end of egg of Camponotus 1 hour old. 



X 360. 

 Fig. 3. Small nucleus found in posterior end of egg of Camponotus 1 hour old. 



X 405. 

 Fig. 4. Longitudinal section through egg of Camponotus 20 hours old, chorion 



removed. X 52. 

 Fig. 5. Longitudinal section through egg of Camponotus 1 day old. X 52. 



Plate II 



Fig. 6. Longitudinal section through egg of Camponotus a little older than the 



stage represented by Fig. 5. X 52. 

 Fig. 7. Portion of a section taken through the layer of peripheral protoplasm of 



anterior end of egg of Camponotus. Same age as that represented by 



Fig. 6. X 405. 

 Fig. 8. Longitudinal section through egg of Camponotus 30 hours old. X 52. 



