PLATE 14. 



Fig. 1. Longitudinal horizontal section through posterior terminal doprcs.sion in an advanced 

 larva of Halomenia gravida. 



Fig. 2. Same; younger than stage represented in fig. 3. X 330. D, v, dorsal and ventral 

 surfaces. 



Fig. 3. Longitudinal horizontal section through larva of about the same stage as fig. 11, pi. 13. 



Fig. 4. Longitudinal horizontal section through oldest larva. 



Fig. 5. Next section to the one represented in fig. 1. The horizontal lines in this and fig. 1 coin- 

 cide. 



Fig. 6. Early stage in the development of the cerebral ganglia. X 360. 



Fig. 7. Longitudinal horizontal section of about the same stage as fig. 12, pi. 13. Arrow indi- 

 cates position of polar body. 



Fig. 8. Longitudinal horizontal section of about the same stage as fig. 6, pi. 13. X 91. 



Fig. 9. Longitudinal horizontal section of about the same stage as fig. 12, pi. 13. X 91. Arrow 

 indicates position of polar body. 



Fig. 10. Polar body and female pronucleus; same stage as fig. 5, pi. 13. X 330. 



Fig. 11. Section through larva of about the same stage as fig. 13, pi. 13. 



