144 



body at its anterior end, immediately behind the constricted 

 neck region (Figs. 33 and 35 KP). Each head kidney is a 



OR 



LP 



TR 



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

 show the heart, tue branchial vessels, and the head kidneys and 

 Wolffian bodies. The tail has been cut off. x 5. 



A, dorsal aorta ; AFi, AFa, afferent branchial vessels of first and 

 third branchial arches; AL, lingual artery; CG, carotid gland; EFj, 

 EFs, efferent branchial vessels of first and third branchial arches ; F, fit 

 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; LI, upper lip; LJ, lower 

 lip ; LP, hind-limb ; OR, genital ridge ; RT, truncus arteriosus ; RV, 

 ventricle ; TC, cloaca ; TO, oesophagus, cut short ; TR, cloacal spout. 



