PLATE 13. 



Chaetoderma vadorum. 



Same species, anterior end. 



Section through dorso-terminal groove. X 330. 



Section at level of brain. 



Hypodermis. 



Ovum showing male and female pronucleus of Halomenia gravida. 



Reconstruction of segmentation stage in the development. 



Longitudinal horizontal section through posterior end of larva of about the same stage 



Nuclei-like bodies in egg; also shown in fig. 5. 



Reconstruction of an advanced larva. 



Reconstruction of another stage about midway between those represented in figs. 6 and 13. 



Reconstruction of early stage somewhat flattened. 



Hypodermis of Chaetoderma squamosum. X 290. 



