FoLSOM. — Development Anurida. 



PLATE 5. 



Fig. 29. Ventral aspect of head, represented as if transparent, at Stage 7. X 480. 

 Fig. 30. Anterior aspect of mouth-parts at Stage 7. From tlie same preparation 



as Figures 24 and 29. X 480. 

 Fig. 31. Paramedian section of head at Stage 7. X 480. 

 Fig. 32. Ventral aspect of left maxilla at Stage 7. X 762. 

 Fig. 33. Dorsal aspect of adult head. X 45. 

 Fig. 34. Anterior aspect of mouth at Stage 8. X 480. 



