Fig. 28. — 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 



OFF. X 5. (After Marshall.) 



Ay dorsal aorta. A /'.I, A /^3, afferent branchial vessels of first and third 

 branchial arche-^. A L, lingual artery. CG, carotid gland. E FA, E FJi, effer- 

 ent branchial vessels of first and third branchial arches. F, fat body. GM^ 

 glomerulus. K A, archinephric or segmental duct, KM, Wolffian bodv. K P, 

 pronephros or head-t^idney, now degenerating. X A^ fore-limb, still within oper- 

 cular cavity. L /, upper lip LJ, lower up. /- /*, hind-limb. OA", genital 

 ridge. R T, truncus arteriosus. R y., ventricle. T'C, cloaca. 7" (?, oesophagus, 

 cut short. TRy cloaca! spout. 



76 



