250 Henry Fox 



Tyr., median thyroid. 



V. D. 1-4, ventral diverticula of the pharyngeal pouches. 



V. F., vestibular fold of mouth. 



V. L. S., ventro-lateral wall of the tympanic pouch. 



V. M. R., ventro-mesial border of the tympanic pouch. 



V. Pc, vesicula prrecervicalis. 



V. v., vitelline veins. 



X., opening of enteron into yolk-sac. 



y., interval between vestibular and submeckelian folds. 



z., indentation separating tympanic pouch and tonsillar fold. 



