NOTES. 485 



Axolotl into an Amblystoma. Cf. on this subject especially 

 August Weismann, in " Zeitsch. fur wissensch. Zoologie," vol. 

 xxv., Sup., pp. 297-334. 



153 (ii. 131). The Leaf-frog of Martinique (Hybdes wor- 

 tinicensis) loses its gills on the seventh day, its tail and yelk-sac 

 on the eighth day of egg-life. On the ninth or tenth day after 

 fertilization the complete frog emerges from the egg. — Bavay, 

 '•Sur THylodes Martinicensis et ses Metamorphoses." "Journal, 

 de Zool. par Grevais," vol. ii. 1873, p. 13. 



154 (ii. 133). " Homo diluvii testis" = Andrias Scheuchzeri. 

 " Sad bone of an ancient evil-doer ; Soften, stone, the heart of 

 the new children of evil " (Diaconus Miller). Quenstedt. 

 "Formerly and Now" (" Sonst und Jetzt," 1856, p. 239). 



155 (ii. 133). The Amnion-structure of the three higher 

 Vertebrate-classes, wanting in all lower Vertebrates, has no 

 connection with the similar, but independently acquired Amnion- 

 structure (analogous, but not homologous) of higher Articu- 

 lated Animals (Arthropoda) . 



156 (ii. 138). The former existence of a Protamnion, the 

 common parent-form of all Amniota, is undoubtedly shown by 

 the Comparative Anatomy and Ontogeny of Reptiles, Birds, and 

 Mammals. No fossil remains of such a Protamnion have, how- 

 ever, yet been discovered. They must be sought in the Permian 

 or Carboniferous formation. 



157 (ii. 147). The former organisation of the Promammalia 

 may be hypothetically reconstructed from the Comparative 

 Anatomy of the Salamander, Lizards, and Beaked Animals 

 ( Ornithorhynclius) . 



158 (ii. 153). The Didelphic ancestors of Man may have been 

 externally very different from all known Pouched Animals (Mar- 

 8U/pialia), but possessed all the essential internal characters of 

 Marsupialia. 



159 (ii. 163). The phylogenetic of the Semi-apes, as the 

 primfflval placental parent-group, is not influenced by our ignor- 

 ance of any fossil Prosimise, for it is never safe to estimate 

 palseontological facts as negative, but only as positive. 



