GROSS ANATOMY 15 



round or oval pale pink bodies on the spinal or ventral surface 

 of the kidney. They lie either free on the surface of the kidney 

 or embedded in its substance. These structures are known as 

 the corpuscles of Stannius. Interrenal tissue is also present in 

 certain of the teleosts at the cranial border of the head kidney, 

 on the anterior and posterior cardinal veins. This tissue was 

 first described by Giacomini. 218 Their existence, in addition 

 to the corpuscles of Stannius, account for the fact demonstrated 

 by Vincent 647 that extirpation of the corpuscles of Stannius in 

 the eel does not result in death. 



The chromaphil tissues of teleost fishes were also discovered 

 by Giacomini. 217 This tissue is found in the wall of the cardinal 

 veins towards the cranial end of the body along the head of the 

 kidney. 



In the Dipnoi (lung fishes) the existence of interrenal tissue 

 has not been demonstrated with certainty. Parker and 

 Giacomini 649 have described a lymphoid tissue in Propterus 

 annectens having an epithelial appearance which they suggest 

 has replaced the interrenal tissue of other species. Further 

 study of this tissue is desirable before one can justifiably 

 deny the existence of interrenal tissue in these fishes. The 

 chromaphil tissue of the Dipnoi has been demonstrated by 

 Giacomini 218 as segmentally arranged bodies around the inter- 

 costal arteries and the wall of the posterior cardinal vein and 

 the right azygos vein. 



The chromaphil and cortical tissues are first found together 

 in the amphibia. In the frog the adrenal is seen as a thin, 

 golden-yellow ribbon closely attached to the ventral surface 

 of the kidney. In Figure 1 are reproduced the kidneys of a frog 

 with their attached adrenals. The greatest part of the adrenal in 

 the amphibia is composed of columns of cortical interrenal 

 cells, the chromaphil cells occurring at the borders of the 

 columns of the cortical cells. This arrangement is transitional 

 between the complete independence of chromaphil and cortical 

 tissue as observed in the fishes and the inclusion of the chroma- 



