666 SUPRARENAL BODIES. 



in Elasmobranchii so closely correspond with that of the mesoblastic part of 

 the suprarenal bodies of the Reptilia, that I have very little hesitation in 

 regarding them as homologous 1 ; while the paired bodies in Elasmobranchii, 

 derived from the sympathetic ganglia, clearly correspond with the part of the 

 suprarenals of Reptilia having a similar origin ; although the anterior parts 

 of the paired suprarenal bodies of Fishes have clearly become aborted in the 

 higher types. 



In Elasmobranch Fishes we thus have (i) a series of paired 

 bodies, derived from the sympathetic ganglia, and (2) an un- 

 paired body of mesoblastic origin. In the Amniota these bodies 

 unite to form the compound suprarenal bodies, the two consti- 

 tuents of which remain, however, distinct in their development. 

 The mesoblastic constituent appears to form the cortical part of 

 the adult suprarenal body, and the nervous constituent the 

 medullary part. 



BIBLIOGRAPHY of the Suprarenal bodies, 



(503) M. Braun. "Bau u. Entwick. d. Nebennieren bei Reptilien. " Arbeit, 

 a. d. zool.-zoot. Institut Wurzlttrg, Vol. V. 1879. 



(504) A. v. Brunn. "Ein Beitrag z. Kenntniss d. feinern Baues u. d. Entwick. 

 d. Nebennieren." Archiv f. mikr. Anat., Vol. VIII. 1872. 



(505) Fr. Leydig. Untersiich. iib. Fische u. fieptilten. Berlin, 1853. 



(506) Fr. Leydig. Rochen u. Haie. Leipzig, 1852. 



Vide also F. M. Balfour (No. 292), Kolliker (No. 298), Remak (No. 302), etc. 



1 The fact of the organ being unpaired in Elasmobranchii and paired in the 

 Amniota is of no importance, as is shewn by the fact that part of the organ is unpaired 

 in the Rabbit. 



