OF THE PARASITIC ISOPODA. 
521 
Fig. 1. Whole egg, Stage I. From a hardened example. 
Fig. 2. Section through centre of blastoderm, Stage I. 
Fig. 2a. A little later than the last. From a hardened egg. 
Fig. 3. Whole egg, Stage II. Ventral side. From a hardened egg. 
Fig. 4. The same ; dorsal surface. 
Fig. 5. Transverse section through thorax of the same. 
Fig. G. Transverse section through frontal lobes of the same. 
Fig. 7. Longitudinal section of the same not quite in the middle line. 
Fig. 8. Transverse section, Stage III. 
Fig. 9. Longitudinal section of the same, a little to one side of the middle line. 
Fig. 10. Transverse section, Stage IV. 
Fig. 11. Horizontal section, same stage. 
Fig. 12. Longitudinal section of the eye (transverse of head): adult. 
Fig. 13. Horizontal section of the eye (longitudinal of head): adult. 
Fie'. 14. Transvere section of head: adult. 
Fig. 1 5. Longitudinal section in median line, Stage V. 
Fig. 16. Whole embryo alive, Stage VI. 
Fig. 17. Optical section of junction of liver coeca and fore-gut, fresh state, same stage. 
Fig. 18. Yolk enclosed in its membrane and liver cceca teased out in the fresh state, 
same stage. 
Fig. 19. Transverse section through thorax, same stage. 
Fig. 20 and 21. Embryos as they leave their parent. 
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