1882 .] 
811 
[Hinckley. 
sionally one or more short fringed folds are inserted within the bor- 
der at the sides of the under lip. The under lip is longer than 
that of Rana catesbeiana, R. fontinalis, R. palustris, and R. hale- 
cma, which form the second group and agree in having three 
fringed folds, variable in length, on the under lip, with a division 
in that next the under jaw. 
In R. catesbeiana (fig. 7) the edge of the upper lip is either 
entirely fringed or furnished partially with papillae and fringe ; 
the papillose portion is shorter by the width of the fringe than 
the remainder of the lip. Under the upper lip are two fringed 
folds each side the upper jaw; the lower one is short and occa- 
sionally wanting in the few teeth that fringe the edge. The 
mouth is spotted and papillae usually marked more or less with 
black. 
The larvae of R. fontinalis, R. palustris, and R. halecina have 
one fringed fold under the upper lip at each side the upper 
jaw, with some variability in its presence in the two last-named 
species. Tadpoles of R. fontinalis (fig. 8) have the papillae, 
folds and floor of the mouth conspicuously marked with black. 
R. palustris (fig. 9), in common with R. catesbeiana and R. fon- 
tinalis, has a mouth of firmer texture than R. halecina. TKe lat- 
ter, both in the upper lip and fringed folds, shows frequently an 
undulated edge. The under jaw of R. palustris and R. halecina 
has a wide margin of color. 
The mouths of the tadpoles of the Ranidae here described, 
have, as a rule, papillae varying in number even in the same spe- 
cies, within the border at the sides of the mouth; these papillae 
are placed as if in continuation of the fringed folds now present 
in the mouth. In larvae of R. halecina it is not unusual to find 
one or two of the fringed folds on the under lip continued par- 
allel with each other and the contour of the lip, taking the place 
of the papillae at other times found in the same space.' One tad- 
pole of this species in my collection has from one to three teeth 
of the fringe attached to two papillae within the border. In all 
the species of the Ranidae found here, short fringed sections are 
sometimes inserted in place of papillae. The mouths of greatest 
delicacy are subject to most variability in this respect. 
