Field. — Pronephros in Amphibia. 



PLATE VIII. 



Figs. 57-60. Reconstructions of several pronephridia of Amblystoma larvae be- 

 longing to Stage V. 



Fig. 57. Reconstruction of a pronephros showing three nephrostomal tubules. 



Figs. 61-65. Reconstructions of several pronephridia of Amblystoma larvae be- 

 longing to Stage VI. 



