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AMPHIUMA TRIDACTYLUM.—Cwvier. 
Plate XXXII. 
Cuaracters. Anterior extremities with three fingers; posterior with three toes. 
Synonymes. Amphiuma tridactylum, Cuvier, Mem. du Mus. d’Hist. Nat., tom, xiv. p. 17. 
Amphiuma tridactylum, Harlan, Med. and Phys. Res., p. 86. 
Description. The description of the Amphiuma means will apply in almost 
all respects to the species with three toes. Its general form is the same; its 
length is twenty times its diameter; the length of its head is nearly one-fourteenth 
of the body; the tail constitutes exactly one-fourth. In a word, in order to dis- 
tinguish them, it is necessary to confine our attention to the extremities, when we 
observe that the hands and feet are divided each into three toes, perfectly distinct, 
which constitutes the only visible external character.” 
Hasirs. I am unacquainted with the habits of the Amphiuma tridactylum, but 
suppose them to be similar to those of the Amphiuma means. 
Grocrapnicat Distrizution. This reptile is found in Louisiana, from which 
state Cuvier received his first specimen. They also inhabit Mississippi and 
Arkansas, as Dr. Pitcher observed them in Neorho river, and presented the 
_ Academy of Natural Sciences of Philadelphia with a fine specimen procured near 
Fort Gibson. 
Genera Remarks. It is to Cuvier that we are indebted for the description of 
this animal. 
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