106 



THE DUCTLESS GLANDS 



importance as bearing upon certain experimental investigations 

 (vide infra, p. 152). 1 



To Giacomini also belongs the credit of having discovered 

 the chromaphil or medullary structures in teleostean fishes. 

 They consist of cells which stain brown with salts of chromium 

 in the walls of the cardinal veins, especially on the right side 

 and towards the cranial end of the body, along the lymphoid 



\ol 



FIG. 21. Transverse section of the Inter-renal body of Trigon violaceus 



(from Diamare). 



tissue of the head kidney. The groups of cells are disposed 

 between the lobes of the cranial cortical body. These had often 

 been searched for by previous observers, but in vain. 



In Ganoids the cortical representatives were noted by 

 Stannius in 1846. He describes them as small whitish or 

 yellowish bodies scattered throughout the substance of the 



1 Giacomini has more recently expressed the opinion that the corpuscles 

 of Stannius are not homologous with the cortical bodies of petromyzon, the 

 elasmobranchs, and higher vertebrates. Their origin, structure, and func- 

 tion put them in a separate category. 





