SHIELD REPTILES. 77 



Family 2. TBIOXYCHID.E. 



Tribe 1. TEIOXYCHIXA. 



Genus 1. XILSSOXIA. 



1. Xilssonia Formosa, Gray, P. Z. S. 1873. Trionyx formosus, 

 Gray, Cat. Suppl. p. 99. 



a. Animal and shell, in spirits ; young. Skull extracted. 

 T. formosus, Gray, P. Z. S. 1869, p. 212, t. 15, f. 1. 

 India, Pegu. Theobald. 68, 4, 3, 142. 



0. Skull, 7| in., of " a." 

 India. 68, 4, 3, 142. 



c. Skull, adult (without animal), 3^ in. 

 Xilssonia formosa, Gray, P. Z. S. 1873. 

 India. 68, 2, 12, 15. 



Genus 2. FOEDIA. 



1. Fordia Africana, Gray, Cat. Siqjpl.jy. 100. 



a. Animal stuffed. Dorsal disk, 23 in. 



Trionyx niloticus, var. Gray, P. Z. S. 1864, p. 88. Fordia Africana, 

 Gray, P. Z. S. 1869, p. 119. 

 Upper Xile. Petherick. 62, 9, 2, 34. 



b. Animal stuffed. Dorsal disk, 22 in. 

 Upper Xile. Petherick. 62, 9, 2, 34. 



c. Skull; length to occiput, 4| in. From " 6." 

 Fordia Africana, Gray, P. Z. S. 1873. 



Upper Xile. Petherick. 62, 9, 2, 34. 



Genus 3. TEIOXYX. 



1. Trionyx gangeticus, Gray, Cat. p. 66 ; Suppl. p. 97. Trionyx 

 javanicus, Gray, Cat. p. 67; notsynon. Potainochelys stellata, 

 Gray, Cat. Supj>l. p. 104; not skull. Tortoises, dc. t. 51 (life). 



a, b, c. Young, in spirits ; 4 in. Back with four black spots. 

 India, Ganges. 



d & e. Animals, young, hi spirits; 4 in. Back with four large and 

 two small posterior black spots. 

 India, Ganges. 



/. Animal, in spirits ; very young. Marks on face and spots on 

 back very distinct. 

 India. Argent. 



