DEVELOPMENT OF TEETH IN HATTEKIA PUNCTATA. 209 



ever, probably due to two causes : (1) the fusion of the alter- 

 nating teeth, which has caused them to occupy less than 

 their proper space on the jaw ; and (2) the large size of the 

 successional tooth in question, due to its importance as the 

 main constituent of the anterior compound tooth. 



Posteriorly are eight fully formed teeth of the uniform 

 series, and one in course of development below the gum. 



From a comparison of numerous adults with the specimen 

 just described, I believe that very little further tooth change 

 takes place. In most adults, however, the first four maxil- 

 lary teeth are clearly successional. The fifth is the latest 

 dentition I have been able to trace in any of my specimens, 

 and this is represented in the premaxillse and maxillae of the 

 present one. 



Literature. 



1. GuNTHER. — "On the Anatomy of Hatteria," 'Phil. Trans.,' 1867, pt. ii. 



2. G. Batjr.— " Osteologische Nolizen," 'Zooloj;. Anzeig.,' 1886, p. 685. 



3. G. B. Howes.— "Remarks on llalteria," 'Proc. Zool. Soc.,' 1890. 



4. SiEBENROCK. — " A Contribution to the Osteology of tlie Head of Hat- 



teria," ' Ann. and Mag. of Nat. Hist.,' ]894 (translated from ' Sitzber. 

 der k. Akad. der Wissensch. in Wien,' 1893). 



5. C. Rose. — " Ueber die Zahncutwickelnng von Chamaeleon," ' Anat. 



Anz.,' Bd. viii, 1893. 



6. BuKCKHAUDT. — " Das Gebiss der Sauropsiden," ' Morph. Arbeit.,' v, 



1896. 



7. G. Bauk. — "Das Gebiss von Splieuodon (Hatteria), etc.," ' Auat. Anz.,' 



vol. xi, 1895, p. 436. 



8. OsAWA. — " Beitrage zur Lehre von den Eingeweiden der Hatteria 



punctata,'' ' Archiv fiir niikros. Anat.,' Bd. xlix, 1897. 



9. A. Dendy. — "Outlines of the Development of the Tuatera, Sphcnodon 



(Hatteria) punctatus," 'Quart. Journ. Micros. Sci.,' N.S., No. 

 165,1899. 

 10. Howes AND Swinnerton. — "On the Development of the Skeleton of 

 the Tuatera, Sphenodon (Hatteria) punctatus," 'Trans. Zool. 

 Soc.,' 1901. 

 VOL. 44, PART 2. — NEW SERIES. O 



