CHELONIA. 



735 



in the adult state, whicli is very different from the waxy- green of the Bhamo 

 male just described from the living but only adolescent animal, the difference 

 in head colouring being the result of sexual maturity, either permanent or 

 seasonal. 



Measurements of shell and caudal vertehrce of B. trivittata, D. 8f B. 



Length of carapace in straight line 

 Length of plastron „ ,, • 



Axillary breadth across plastron 

 Inguinal „ „ „ 



Greatest depth of shell 

 Breadth of shell over greatest curve 

 Length of caudal vertebrse . 



17"' 50 

 16"-00 

 6"- 75 

 6"-75 

 7"-80 

 16"50 

 7"-75 



The skull is very closely allied to the skull of B. lineata, the two species 

 having the same form of palate, but the posterior plate of the palate in B. lineata 

 is much broader than in B. trivittata, and the posterior nares of the former are 

 narrower than in the latter ; also the pterygoid portion of the skull of B. trivittata 

 is broader than in B. lineata. The nose of the latter is less upturned than in 

 B. trivittata, and the muzzle of the latter is narrower, longer, and more pointed ; and 

 the margins of the jaws not so strongly serrated. In general form, it also closely 

 resembles the skull of B. duvaucelli, and in the upturning of its nose is almost 

 exactly like that species, but its posterior nares are much more open and the palatal 

 region is separated from that of B. duvaucelU by the narrow character of the poste- 

 rior plate. 



I have figured the skull of the young male (PL Ixxv^, figs. 1 to 5). 



The small tongue is marked by a slight median groove, on each side of which are 

 a few blackish oval fleshy processes, the most posterior being divided into finger-like 

 points, and external to this there is, on each side of the base of the tongue, a bunch 

 of these finger-Like processes separate from the others. The larynx forms a flattened 

 triangular eminence, with a longitudinal crenated slit in its centre, the external mar- 

 gins of the eminence being surrounded by a fringe of processes, like those occurring 

 on the tongue. Behind the larynx, the first part of the oesophagus is covered to a 

 limited degree with papillary eminences, as in ^. haska, B. thurgi, and in B. duvau- 

 celU. These become flattened and lamellar in some instances, and close behind the 

 larynx form two short lines, which, losing their lamellar and papillary character, 

 rapidly increase in number and assume the form of fine wavy longitudinal mucous 

 ridges, prolonged into the first part of the stomach as much thicker longitudinal 

 folds, twelve to fifteen in number, which disappear shortly after entering the 

 stomach. The stomach is considerably dilated up to the left border of the liver, 

 and from the longitudinal folds, to this point, is smooth. Its transverse portion, to 

 below the narrow mesial isthmus of the liver, is funnel-like and with very thick 

 walls, with muscular coats nearly a quarter of an inch in thickness. At its extremity 

 this portion of the stomach rapidly contracts into a small pyloric-like orifice, and 

 its inner surface is marked with about eight somewhat wavy thick longitudinal 



