PENSYLVANIAN TORTOISE 6l 



up the shell. It is from this circumstance that 

 it appears to have been sometimes confounded 

 with the species just mentioned, though widely 

 differing in other particulars. The head, on the 

 parts surrounding the jaws and the eyes, is of a 

 reddish yellow colour: the upper part dusky, as 

 are also the neck, legs, and tail: the feet are 

 webbed, and have five toes on the fore, and four 

 on the hind feet : the tail is small, rather short, 

 and terminates in a callous or horny point, curv- 

 ing shghtly downwards. It is a native of North 

 America, and is found in Pensylvania, &c. inha- 

 biting muddy waters, and is known by the name 

 of the Mud Tortoise. When living, it is said to 

 have a strong musky odour. 



VARIETIES. 



Mr. Schoepf mentions a variety, m which the 

 under shell was not moveable, and imagines it to 

 constitute a sexual difference. 



In the British Museum, are specimens of about 

 the size figured by Edwards, one of which differs 

 very considerably from the rest in having a very 

 conspicuous carina or ridge down the back, o^v- 

 ing to the sudden sloping of the sides : in other 

 particulars it resembles the rest. 



A much more remarkable variety (if it be not 

 rather a distinct species) occurs in the Leverian 

 Museum. This shell measures about four inches 

 and three quarters in length, and has every ap- 

 pearance of being full grown. Its colour is 



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