1S02.] ^" [Baur. 



In 1828, Ritgen* subdivided the genus Emys, in Eimjs and Clemmys, 

 and retained Terrapene Merrem. 



The following species are united with Clcmmys : E punctata, planiceps, 

 glutinata, centrata, subrufa, melnnoccphala. Of these j&. punctata Schopfi. 

 = T. guttata Schneider, has to be considered as type. 



As correctly stated by Prof. Vaillant, T. picta Schn. has to be con- 

 sidered as type of Emys, and Chrysemys Gray, 1844, becomes therefore a 

 synonym of Emys. 



The first author who subdivided the Terrapene Merrem, as limited by 

 Bell in 1825, was C. L. Bonaparte, f who separated the American box 

 tortoises under Fleming's name Cistiula in 1830 and 1831, from Emys, 

 with T. orbicularis as the type. 



In 1836, Fitzinger proposed a new name, Fyxidemys, to contain the fol- 

 lowing species : T. Carolina L. (T. sclieideri Schwelgg., T. mrgulata Daud.), 

 Sternothcerus trifasciatus Bell, and T. amboinensis Daud. If there would 

 be an objection to the name Cistuda in the sense of Bonaparte, Fitzinger's 

 name Pyxidemys ought to be used with the T. Carolina L. as type. But I 

 think it will be the best to use the name Cistuda in the correct form of 

 Cistuda. 



As a result we have the following : 



Emys C. Dumeril, s. str. = Chrysemys (Gray), Type T. picta Schneider. 

 Terrapene Merrem =Emys (Boul.) " T. orbicularis Lin. 



Cistuda Bonap. non Flem.= Cistudo (Boul.) " T. Carolina Lin. 



Cyclemys BeW =Cyclemy8 (Boul.) " E. DJior Gray. 



Clemmys Kitgen = Clemmys part (Boul.) " T. guttata Schn. 



I have shown some time ago that in Cistudo major Agassiz, the 

 zygomatic arch is complete (Science, April 3, 1891, p, 190), as in T. amboi- 

 nensis Daud. , notwithstanding I believe that the Asiatic and American 

 forms are generically separate. I am unable to say whether T. amboi- 

 nensis Daud. belongs to the genus Cyclemys Bell, with E. Dhor Gray as 

 type, or not. Prof. Vaillant is inclined to place T. amboinensis in a genus 

 distinct from Cyclemys Bell, for which he uses the name Terrapene. The 

 correct name would be Cuora Gray, introduced in 1855. 



The whole question relating to the taxonomy of Emys Dumeril may 

 be developed in the following table : 



* "Ritgen,''F. A., Versuch einer natiirlichen Eintheilung der Amphibien," "Nova 

 Acta Nat. Cur.," Vol. xiv, pp. 257-284, Bonn, 1828. 



t Bonaparte, C. L., " Osservazioni sulla secouda ediziona del Regno Animale del Ba- 

 rone Cuvier," Bologna, 1830. And " Saggio di una distribuzione metodica degli Animali 

 Vertebrat Giornale Arcadico di Seienze," etc., Roma, Vol. xlix, 1831. 



