ERRATA AND ADDENDA. 



Page 46, 9th line, for "centra" read "centre." 

 ,, 83, 5th line, for "when" read "where." 

 ,, 136, in Fig. 109, SR should indicate the space below DM, and the line from A 



should point to the layer indicated by SR. 

 ,, 249, Fig. 203, for "Siluris" read "Silurus." 



Insert under Bibliography : 

 On p. 160 : 



GRAAF, HENRI "W. DE. Zur Anatomic und Entwickelung der Epiphyse bei 

 Amphibien und Reptilien. Zool. Anzeiger, IX. Jahrgang, No. 219, 1886. 



SPENCER, W. BALDWIN. The Parietal Eye of Hatteria. Nature, May 13th, 

 1886. (De Graaf shows that the epiphysis really corresponds to an un- 

 paired sense-organ, and Mr. Spencer has found a .well-developed median 

 eye in Hatteria and other Lizards. Compare p. 133 of this book.) 



JOHNSON, ALICE, and SHELDON, LILIAN. On the Development of the Cranial 

 Nerves in the Newt. Proc. Roy. Soc. 1886. 



On p. 294 : 



PARKER, T. JEFFERY. On the Blood- Vessels of Mustelus antarcticus. A Con- 

 tribution to the Morphology of the Vascular System in the Vertebrata. 

 Abstract in Proc. Roy. Soc. 1886. (Not yet published in full.) 



