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B. fusca, Gray, 



Nuchal plate triangular. Shell indistinctly keeled and very 

 broad behind. The first and second vertebrals nearly square, the 

 third sub-hexangular broader than long ; the posterior sides 

 shorter. The fourth sub-hexangular, hinder side short and rather 

 narrow behind, much longer than broad. Colour above brown, 

 beneath yellow. 



Inhabits India (Gray). Sup., Cat. S. R., p. 56. 



Of these two species I know nothing beyond the meagre 

 descriptions of them, and it remains I think to be seen how far 

 both of these are distinct from ' lineatus.' 



Tetraonyx, Lesson, 



Characters of shell same as Batagur, but only four claws on all 

 feet. It would seem to affect brackish waters and estuaries. 



T. baska, Bu. Ham. mss.. Gray. 111. Ind. Zool. 

 Batagur hasJca, Oray. Giinther Monog., p. 37, pi. 3 f. B-B.' 

 T. Lessonii, Dum et Bib. 

 T. longicollis, Less. 

 Nuchal plate sub-quadrangular. Four anterior vertebrals 

 nearly as broad as long, fifth hexagonal, all smooth. Head 

 covered with an undivided skin, nose upturned. Colour uniform 

 pale brown. Grows to 24 inches. 



Inhabits Pegu, Tenas.-^erim, the Malaj^an Peninsula, and Bengal. 



T. pictus, Gray. P. Z. S., 1862, p. 264. 

 Callagur picta, Gray. Sup. Cat., S. R.., p. 53. 

 Nuchal plate none. Inhabits Borneo. May perhaps range 

 into Tenasserim. 



Family Platysternid^. 

 Characters of the sole genus. 



Platysternon, Gray. 



Thorax and sternum united into a bony case. Shell depressed. 



Head very large, covered with a horny case. Tail very long, 



covered with rings of sub-quadrangular shields. Toes webbed. 



Claws strong, five before, four behind. Carnivorous. 



D 



