THE WOLFFIAN BODIES AND DUCTS. 



193 



become massed together, with the blood-vessels in relation with 

 them, to form the definite Wolffian bodies or kidneys (Figs. 85, 

 86, and 87, km). 



1 . The Wolffian Ducts or Ureters. 



The segmental duct is at first the duct for the head kidney 



Fig. 8; 



Fig. 86. 



Fig. 85. — A 40 mm. Tadpole, dissected from the ventral surface to show the 

 heart, the branchial vessels, and the urinary and reproductive organs. The 

 tail, and the alimentary canal, from the oesophagus to the rectum, have 

 been removed, x 4. 

 FlG. 86.— A Tailed Frog, during the metamorphosis, dissected from the ventral 

 surface to show the urinary and reproductive organs. The alimentary 

 canal has been removed, x 3|. 



A. aorta. AF-1. A3T.4. afferent vessels of first and fourth branchial arches. AL. 

 lingua] artery. OCr» carotid gland. EF.l, EF-4, efferent vessels of first and fourth 

 branchial arches. F, fat body. GM, glomerulus. KA, segmental duct. KM- 

 Wolffian body. KP, head kidney. KU. Wolffian duct or ureter. LA, fore limb. 

 LI, upper lip. L J, lower lip. LP. hind limb. O. mouth. OB., genital ridge. RT- 

 truncus arteriosus. RV, ventriele. TOs cloaca. TO, oesophagus. TR, aperture of 

 rectal spout. 



alo 



one (Fig. 74, ka) ; in the later stages (Figs. 83 and 85), it 

 serves for both the head kidney and the Wolffian body. 



o 



