IV 



THE SUPRARENAL ORGANS 



285 



become shifted in a ventral direction round the dorsal aorta and 

 take up their position in intimate contact with the interrenal bodies, 

 lying in the posterior paired region of the interreual on its mesial 

 face, elsewhere dorsal or lateral or even completely surrounding the 



s.c. 



sc, 



I. 



ent 



KK;. 144. Illustrating origin of the sclerotome as seen in transverse sections 

 through young stages of 



A, Amphioxux (for tin* sake, of clearness the spaces have been exaggerated, ami the ventral portion of 

 the diagram is taken from a rather younger staur than the dorsal); B, Lepidosiren, stage _'! ; ( ', 

 roli/jitrrnt, stage _':?. ent, enteric cavity; /////, niyntmne; JV, notodmrd ; n,; nephrocoele ; y/i. 

 pronephros ; s.c, spinal cord; sd, sclerutonie ; sn, BUbnotOChordftl rod; S}i!<; splanchnocoele. 



interrenal. The chromophile bodies stand out with great distinct- 

 ness from the interrenal by their fine grained deeply-staining proto- 

 plasm and their larger nuclei. 



We thus see that in the Amphibia the originally separate inter- 

 renal and chromophile bodies become during the course of develop- 



