EMYS TROOSTII. 125 



is lengthened out into a narrow line along the lateral and superior part of the 

 neck; another and more distinct greenish-yeUow Ime is observed along the lateral 

 and inferior part of the throat, increasing in size to the junction of the jaws, 

 where it subdivides into two branches; the one going to the upper jaw, terminates 

 at its posterior part, that running to the lower jaw, ends midway between the 

 condyle and symphysis. Beginning at the chin is another broad pale straw- 

 coloured Ime, which subdivides after a short distance, the branches continuing 

 along the inferior surface of the neck; a third line begins near the pomt of 

 subdivision of the last, small, but increasing in breadth, and running nearly in the 

 middle of the inferior surface of the neck; between these lines are many inter- 

 mediate ones, smaller and less distinct. 



The anterior extremities are dusky in front, with a broad palish straw-coloured 

 band near the lower part; the inferior border is yellow; the posterior surface 

 blackish-brown. The posterior extremities are dusky above, with a yellowish 

 line along the posterior margin of the thigh, and dusky below, with two or three 

 mterrupted yellow lines. On the lower extremity of the thigh is a large triangular 

 spot; the apex of which triangle is contuuied into a line along the anterior 

 and uaferior border of the leg to the root of the first toe. The tail is dusky 

 above, and blackish-brown beneath, with blotches of greenish-white; towards the 

 extremity on each side is a lateral yellowish-green line. 



Dimensions. Length of shell, 8 inches; greatest breadth, 7? inches; length of 

 sternmn, 6i inches; length of tail, 2| inches; length beyond the vent, 1? inches; 

 height of the animal, 2| inches. 



Geographical Distribution. These animals abound in our western rivers. 

 The accompanying plate was taken from a fine specimen sent me from the 

 Cumberland river by Professor Troost, who has done so much to elucidate the 

 natural history of that part of the United States, and to him I have dedicated 

 the species. 



