94 RANA HALECINA. 
Gmelin, in his edition of the Systema Nature, gives the name Rana pipiens 
to this frog, but for what reason and on what authority I know not, as he refers at 
the same time to the original name, halecina. Daudin separated this frog, not 
only from the Rana ocellata, but from all others, and described it under the name 
Rana halecina, the original one given by Kalm. 
Schlegel* believes our animal to be identical with the Rana esculenta of the old 
world, of which it is only the representative here, and from which it really differs 
in many particulars: 
1. The Rana halecina is the smaller animal. 
2. The head is larger in proportion. 
3. The toes are less extensively palmated. 
4. There are no openings on the sides of the jaws, at the angle of the mouth, 
out of which the vocal vesicles pass when distended with air, as in the Rana 
esculenta. 
* Revue Zoologique, No. xii. 1838, p. 321. 
