194 



THE FEOG, 



D uring the metamorpliosis , and s hortly before the comp lete 

 dis appearance of the tail, the h ead kidney separates from the 

 s egmental duct. For a short time, a portion of the segmental 

 duct still persists in front of the Wolffian body ; but this soon 



PA / / / \ \ \ \ WG 



WD r/, ' \ ^ ^ F 



W VA Tl VO 



Fig. 87. — Transverse section through the hinder part of the body of a Tailed 

 Prog during the metamorphosis (cf. Fig. 86). On the right side a spinal 

 nerve is shown, on the left side the vertebral column, x 1 7. 



A, aorta. CH, notochord. F, fat body. IC, centmm of vertebra. IE, neural 

 arch of vertebra. KA, WolfBan duot. KS, nephrostome. KT, Wolffian body. LG, 

 lung. LS, stomach. LY, subcutaneous lymph space. ML, myotome. !N"C, spinal 

 cord. ITD, dorsal root of spinal nerve. WIT, spinal nerve, main trunk. KTV, ventral 

 root of spinal nerve. WY, sympathetic nerve ganglion. OV, ovary. PA, pancreas. 

 SK", spleen. TI, intestine. VA, anterior abdominal vein. VI, posterior vena cava. 

 VO, hepatic portal vein. VR, renal portal vein. "W", liver. WD, bile duct. "WQc^ 

 gall bladder. 



loses its lumen, undergoes degenerative changes, and disappears : 

 the remaining, or posterior part of the segmental duct, which is 

 now connected with the Wo lffian body alone, is from this tim e 

 apoken of as the Wolffian duct or ureter. 



The vesicTila semiaalis is a glandular body developed in con- 



