120 THE BIOLOGY OF THE FROG CHAP. 



Vertebrate Embryology." Lists of the most important literature on the 

 subject will be found in the works of Marshall and Morgan just referred 

 to. The following papers deal with the characteristics and metamor- 

 phoses of tadpoles : 



Barfurth, D. Versuche u'ber die Verwandlung der Froschlarven. 

 Anat. Anz., Bd. i. 



Boulenger, G. A. A Synopsis of the Tadpoles of European Batra- 

 chians. Proc. Zool. Soc. London, 1891. 



Camerano, L. Observation! sui girini degli Anfibi anuri. Boll. 

 Mus. Torino, 8, 1893. 



Copeland, E. B. Heterogeneous Induction in Tadpoles. Science, 

 n. s., Vol. 13, 1900. 



Hinkley, M. H. On Some Differences in the Mouth Structure of 

 Tadpoles of the Anurous Batrachians found at Milton, Mass. Proc. 

 Bos. Soc. Nat. Hist., Vol. 21. 



Ryder, J. A. The " Ventral Sucker" or " Sucking Disks" of the 

 Tadpoles of Different Genera of Frogs and Toads. Am. Nat., Vol. 22. 



