Turtles of the Genus Pseudemys. 
79 
7907] 
of brown and yellow lines, these forming more or less distinct 
concentric figures, parts of three of which usually enter each 
costal plate. Markings of the carapace usually not definitely 
transverse to the axis of the body, on the costals. Marginal 
plates marked above with a median, vertical, yellow bar, and 
yellow concentric figures between the yellow bars of adjoin- 
ing plates; quite frequently, however, the vertical bars are 
absent on some of the plates and the concentric figures 
ieplaced by longitudinal yellow lines, continuous on adjoining 
plates, this occurring on the middle and posterior marginals, 
but not usually on the anterior ones. In seven adults this 
feature is present or absent as follows: In one the longi- 
tudinal lines replace the vertical bars and concentric lines on 
all the marginals; in two others they do not occur at all; in 
a fourth they occur only on marginals 4, 5, 6, right, and 11, 
12, left; a fifth has them on the four middle marginals on 
each side; a sixth on numbers 5, 9, 7, right, and 6, 7, left; a 
seventh, on numbers 4, 7, 8, 9, 11, on both sides, and on No. 
12, right also. The presence of a vertical yellow bar across 
the center of each marginal is so constant in all specimens of 
Pseudemys that I have seen, except those from Raleigh, that 
the variation seems worth noting. Head and legs with yel- 
low stripes. Plastron yellow, unblotched. 
In the shape of the shell there is also a good deal of varia- 
tion, some specimens being broad and flat with a median, 
dorsal depression; others are broad and flat but lack the dor- 
sal furrow, while others again have comparatively high and 
arched shells, and in any case the dorsal depression is only 
present in full grown specimens, not in young nor in half 
grown ones. The flat shelled specimens seem to be mainly 
males, and the more arched ones females, but I have not exam- 
ined enough specimens to be sure that the variation is wholly 
sexual and not individual. 
The size of the head also varies, being large in some spec- 
imens and small in others, the difference being apparently 
