72 The Comparative Physiology of the Suprarenal Capsules. 



bodies ("medullary glands" they may be called), while the cortex 

 corresponds to the interrenal body. 



2. In Teleosts the medulla appears to be unrepresented, the known 

 suprarenal bodies (" corpuscles of Stannius ") consisting entirely of 

 cortical substance, and corresponding in structure, and most prob- 

 ably in function, to the interrenal body of Elasmobranchs. 



3. The same is most probably true of Ganoids, although I am 

 guided here solely by histological evidence; I have not been able to 

 obtain sufficient and suitable material for physiological investigation. 



Thus it appears from these researches that two primary groups 

 of the class Pisces (Teleosts and Ganoids) have no " medulla " but 

 only " cortex."* So far as I know, the only piece of work published 

 on the physiology of the suprarenal capsules in fishes is that of 

 Pettit (12). This observer has made out a true physiological com- 

 pensatory hypertrophy of one suprarenal in the eel after the other 

 one has been removed. This renders it probable (what indeed was 

 suggested by histological appearances) that this " cortical gland " 

 has a secreting function. Pettit looks upon this organ in the eel as 

 the fundamental type of the suprarenal capsule, but it appears to me 

 much more probable that it represents cortex alone. 



PAPERS REFERRED TO. 



1. Balfour, E. M., 'A Monograph on the Development of the Elasmobranch 



Fishes.' London, 1878. 



2. Cybulski, 'Anz. der Akad. d. Wiss. in Krakau,' March, 1895. 



3. Cybulski, ' Gaze ta lekarska,' 1895, No. 12. "Warschau. 



4. Cybulski, « Centralblatt f. Physiologie' (No. 4, Bd. 9). 



5. Diamare, ' Mem. della Soc. Ital. delle Scienze (detta dei XL)," Serie 3, Tome 10, 



1896. 



6. Leydig, E., ' Beitrage zur Mikros. Anat. &c., der Rochen u. Haie.' Leipzig, 



1852. 



7. Leydig, F., ' Fische u. Reptilien.' Berlin, 1853. 



8. Mihalkovics, ' Internat. Monatschr. f . Anat,, &c.,' Bd. 2, 1885, pp. 389—402. 



9. G-. Oliver and E. A. Schafer, ' Proc. Physiol. Soc.,' March 10, 1894 (< Journ. 



of Phys.,' vol. 16. p. 1). Preliminary communication. 



10. Gr. Oliver and E. A. Schafer, * Proc. Physiol. Soc.,' March 16, 1895 (' Jourm 



of Phys.,' vol. 17, p. 9). Second preliminary communication. 



11. G. Oliver and E. A. Schafer, 1 Journ. of Phys.,' vol. 18, Ko. 3, 1895, p. 230. 



12. Pettit, A., ' These,' Paris, 1896. 



13. Szymonowicz, L., ' Sitzung d. Akad. d. "Wiss. in Krakau vom 4 Febr., 1895.' 



14. Szymonowicz, L., ' Arch. f. die ges. Physiologie,' Bd. 64, 1896. 



15. Vincent, Swale, ' Proc. Birm. ]S T at. Hist. & Phil. Soc.,' 1896, vol. 10, part 1, 



p. 1. 



* This fact -would seem to suggest that the cortex may be more important than 

 the medulla, for, whereas in certain vertebrates the medulla can be dispensed 

 with, the cortex is universally present. 



