12 TRIONYX FEROX. 



Testudo ferox, Schoepff, Hist. Test., p. 8S, f. xix. 



Testudo verrucosa Bartrami, Schoepff, Loc. Cit., p. 90. 



Testudo ferox, LatreiUe, Hist. Nat. Rept, lorn. i. p. 165. 



La tortue de Pennant, Duitdin, Hist. Nat. des Rept., torn. ii. p. 69. 



Testudo Bartrami, Daudin, Loc. Cit., p. 74. 



Testudo ferox, Shaw, Gen. Zool., vol. iii. part i. p. 64, pi. xvii. fig. 1. 



Trionyx Georgicus, Geoffroy, Ann. Mus., torn. xiv. p. 7. 



Trionyx Bartrami, Geoffroy, Loc. Cit., p. IS. 



Trionj-x ferox, Schweigger, Arch. Konigsb., vol. i. p. 285. 



Trionyx ferox, Mei'rem, Versuch. eines Syst. der Amphib., p. 20. 



Trionyx ferox, Say, Jour. Acad. Nat. Scien. Philad., vol. ii. p. 203. 



Trionyx spiniferus, Lesueur, Mem. du JNIus., tom. xv. p. 25S, pi. vi. figs, a, b. 



Testudo ferox, Leconte, Ann. L3'c. Nat. Hist. N. Y., vol. iii. p. 93. 



Aspedonectes ferox, JVagler, Naturlich. Syst. der Amphib., p. 1 34. 



Trionyx ferox. Gray, S3'nops. Rept., p. 43. 



Trion3-x ferox, Har/an, Med. and Phys. Res., p. 15S. 



Gymnopus spiniferus, Dumcril ef Bibron, Hist. Nat. des Rept., tom. ii. p. 477, pi. xxii. 



fig. 1. 

 Soft-shelled Tortoise, or Soft-shelled Turtle, T'li/go. 



Description. The shell is sub-oval, larger behind, entire, ecarinate, greatly 

 depressed, and smooth above, except where some tubercles are situated on its 

 posterior soft portion. These tubercles are small, disposed in rows, and reach 

 from the margin to the circumference of the bony disk. At the anterior border 

 are seen a number of pointed or conical tubercles; many of them are almost 

 horny at the tip. 



The sternum is oval, entire, and full in front, extending even beyond the 

 carapace; its anterior part is cartilaginous and movable, and can be drawn 

 upwards at the will of the animal, so as to touch the carapace, and thus conceal 

 the head when retracted. Posteriorly the sternum is also entire, but smaller, and 

 much less extensive, leaving the e.xtremities completely exposed. 



The head is large, elongated, oval, with the forehead considerably elevated, and 



