Os'inotic Eqidihration. 253 



Tablk 



mo'litied in accordance with considerations contained in the 

 foregoing paper. 



MamniaHa (Triassic) Aves (Jurassic) 



I I 



I Teleostei (Triassic) 



Reptilia (Permian) 



Amphibia (Devonian) Holstei (Permian) 



■ \__ i 



Dipnoi (Devonian) 



I 



Chondrostei (Devonian) 



Holocephali (Devonian) Existing Elasmobranchii 



] I 



I 



Primitive Eh\smobranchii 

 (Cambrian and Silurian) 



REFERENCES. 



1. Bottazzi. — Ergebnisse d. PhA^siol., 1908, S. 246, et. seq. 



2. Bottazzi.— Ergebnisse d. Physiol., 1908, S. 267. 



3. Bickel. — Handbiich d. Biochem. (hgb. von Oppenheimer), 

 Bd. III.. Ite Halfte, S. 86. 



4. Fredericq.— Arch. Biol. (XX.). 1904, p. 709. 



5. Jolyet.— Comptes rend. Soc. d. Biol., 1902, 54. p. 293. 

 (Quoted by Portier.) 



6. Macallum.— The Paleochemistry of the Ocean. Trans. 

 Canad. Instit., Vol. VII. (1902), p. 532. 



7. Macallum.— Proc. Roy. Soc, vol. 82 B, p. 602. 



8. Ortmann. — Geographical Distribution of Decapods, 

 Proc. Amer. Philosoph, Soc, Vol. XII., No. 171, p. 387. 



9. Parker and HaswelL— Text Book of Zoology, 1897; Vol. 

 II.. p. 516. 



