PLATE 2 



EXPLANATION OF FIGURES 



21 A larva before hatching, Stage VII. 



22 Same, Stage VIII. X 15. 



23 Same, Stage IX. X 15. 



24 Same, Stage X. X 15. 



25 Same, Stage XI. X 15. 



26 Same, Stage XII. X 15. 



X 15 



REFERENCES 



/. br., fore-brain 



f. I., fore-limb 



g. ar., gill arch 

 h. I., hind limb 

 m. br., mid-brain 



m. d., mandibular arch 



7ned., medulla 

 mx., maxillary process 

 olf. p., olfactory pit 

 op. v., optic vesicle 

 ot. v., otic vesicle 



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