150 



DEVELOPMENT OF THE FROG 



the fully-formed tadpole (Fig. 35 KM). At the same time the 

 head kidneys diminish in size, and undergo degenerative changes, 



Fig. 35. A 40 mm. tadpole dissected from the ventral surface to show 

 the heart, the branchial vessels, and the head kidneys and Wolffian 

 bodies. The tail has been cut oft. x 5. 



A, dorsal aorta : AFl, AF3, afferent branchial vessels of first and third 

 branchial arches : AL, lingual artery : CG, carotid gland : EFi, EF3, 

 efterent branchial vessels of first and third branchial arches : F, fat body : 

 GM, glomerulus : KA, archinephric or segmental duct : KM, Wolffian 

 body : KP, pronephros or head kidney, now degenerating : LA, fore limb, 

 still within opercular cavity : L!, upper lip : LJ, lower lip : LP, hind 

 limb : OR, genital ridge : RT, truncus arteriosus : RV, ventricle : TC, cloaca : 

 TO, oesophagus, cut short : TR, rectal spout. 



