Baur.] ^11 [May 5, 



Trionyx javaniciis Geoffr., Testudo cartilaginea Bocklaert. 

 " coromnndelicus Geoffr., 7'es(udo punctata Laccpede. 

 " georgicus Greoffr., 2'estudo ferox Schneidei: 

 " euphraticus Geoflfr., Testudo euphratica Daudin. 



In 1830 Wagler* divided the genus 'Trionyx Geoffr. into two genera — 

 Trionyx and Aspidonectes. 



Asjndonectes is thus characterized : "Thorax cartilagine flexibili limba- 

 tus ; digiti tres palm;e planta?queunguiculati ; " and the following species 

 are named : Trionyx mgyptiacus Geoffr., Trionyx javanicus Geoffr., I'es- 

 tudo ferox Penn., Trionyx muticus Les., 'Trionyx earinatus Geoffr. 



Trionyx is characterized thus : "Thorax limbo osseo mobili auctus ; 

 digiti Aspidouectis ;" and the single species Testudo jmnctata L-Acip. is 

 noted. 



One year later, in 1831, Gray f divides also the genus Trionyx Geoffroy 

 in two divisions — Trionyx and Emyda. Among Trionyx he names 

 T. ferox Merr., 1\ muticus Les., T. cegyptiucus Geoffr., T. indicus Gray, 

 1\ hurum Gray, T javanicus Geoffr., T suhplanus Geoffr., T. eupfiraticzts 

 Geoffr. Among Emyda he names Trionyx (Emyda) punctata Lacep. 



The characters of Trionyx are : "The margin of the shields cahilagin- 

 ous and the sternum narrow." Those of Emyda: " Margin of the siiield 

 with a series of small bones in front and behind; limbs covered, when 

 withdrawn, by the valves on the side of the sternum." 



It is evident that Trionyx Gray is the same as Aspidonectes Wagler, and 

 Emyda Gray the same as Trionyx Wagler ; the name Emyda Gray can 

 therefore not be admitted. Besides the name Emyda had already been 

 used by Rafinesque {Analyse de la Nature, Palerme, 1815, p. 75) for Emys 

 Dum. A few months later Gray |: published a "new edition " of his 

 Synopsis Reptilium. He now separates Emyda com.pletely as a distinct 

 genus from Trionyx. Meanwhile he had seen Wagler's paper, and he 

 states in the Additions and Corrections, p. 78, " Dr. Wagler keeps the 

 generic name of 'Trionyx for my Emyda and uses that of Aspidonectes for 

 my Trionyx.'' 



In 1833, Bonaparte ^ follows Wagler, using Trionyx and Aspidonectes. 



In 1835, Dumeril et Bibron || propose the new names Oymnopus for 

 Aspidonecttsy^dg\{iY and Cryptopus for Trionyx Wagler, which, of course, 

 cannot be accepted. 



• Wagler, Dr. Joh., NatiirlicheH System der Ampliibien, Miincheti, Stuttgart uiid Tiibingeii, 

 1830, p. 134. 



•fGray, J. E., " A Synopsis of the Species of the Class Reptiliu," pp. IS, 19, Appendi.^ to 

 Vol. i.K of Griffith's .Anwicti Kingdom, London, 1831. 



i Gray, John Edward, Synopsis Reptilium; or, Short Descriptions of the Species oj' Reptiles, 

 Parti, "Calaptracta," Londou, 1831, pp. 44-50. 



§ Bonaparte, C. L., Saggio el'una Distribuzioiie Melodica degli Animali Vertebrali a Sangue 

 Freddo, Koma, 1832, p. 13. 



II Dumeril, M. C, et G. Bibron, Espetologie Generak, Paris, 1835, Vol. ii, pp. 472, 499. 



