THE BATEACHIA OF NORTH AMERICA. 45 



well developed, aud terminates just below the elbow. The toes come 

 iu the order of length as follows, beginning- with the short inner, 1, 5, 

 2, 3, 4 J and the phalanges, iu the same order, are 2, 2, 3,3, 2. The 

 three external are ribbed from the tips ; the notch between the third 

 and fourth reaching the end of the first phalange, but between the 

 fourth and fifth extending from tip to tip, with a very slight notch 

 (easily enlarged by tearing) ; the legs are about as long as in C. allcghe- 

 niensis. When they are pressed to the side they are separated by a 

 distance equal to one and a quarter times the length of the hinder leg. 

 This measurement must be taken with some allowance, as the specimen 

 has been coiled in strong alcohol, and its true form is not easily restored. 

 It is impossible to distinguish the true lateral folds. An estimate 

 makes them equal those of the other species, fourteen. The tail has 

 tlie usual form. Its superior outline rises from the base, and is convex, 

 aud consists partly of a thin dermal border. The extremity is thin, as 

 is also the distal fourth of the inferior edge. 



Measurements. 



M. 



Total leugtli 0.440 



Length to end of vent 295 



Length to groin 215 



Length to axilla 100 



Length to line of can thus oris 015 



Length of anterior leg 039 



Length of anterior foot 015 



Length of posterior leg , 053 



Length of posterior foot 0245 



Width between external narcs 012 



Width between orbits 025 



Width of head '. 051 



Depth of tail at middle 042 



The color of this specimen is a rich chocolate brown; the inferior sur- 

 faces rather ])aler than the superior. No spots. 



Catalogue number. 



No. species. 



Locality. 



Knoxville, Tenn 



Donor. 



Professor Mitcliell. 



AMBLYSTOMID^. 



This family is of particular interest among the Urodela, as furnishing 

 connecting forms between the ordinary types of the order aud those 

 larger species which we suppose to be more characteristic of former 

 periods of the earth's history. It also furnishes us with transitional 

 conditions of characters which liave been regarded as indicating very 

 diverse origin and nature. The species are mostly of large size, and 

 are probably confined to North America ; perhaps a species exists in 

 Farther India. 



