382 New Species of Fresh Water Tortoise. 
. Arr. XXIL.—Description of a new species of fresh water Tor- 
toise, inhabiting the Columbia River; by Ricuarp Haruan, 
MiDs FF: LS 
Emys Oregoniensis—(see plate.) 
Characters.—Shell suboval, moderately depressed ; dark brown 
or olive, with bright yellow irregularly disposed lines with black bor- 
ders; anterior marginal plates very deep: sternum oblong, slightly 
constricted in the middle, emarginate and bidentate anteriorly, bright 
yellow, beautifully and curiously figured with black, with yellow 
curved longitudinal lines ; head of moderate size, upper jaw biden- 
tate at tip. 
Description.—Shell broadest posteriorly, about the usual height 
of animals of this genus, rather depressed, very slightly emarginate 
behind, more so anteriorly, there being a deep notch on either side 
of the single anterior marginal plate, which is nearly pointed anterior- 
ly ; the vertebral plates five in number, the first nearly square, the 
second, third and fourth irregularly hexagonal, the posterior border 
of the latter curved so as to admit the arched anterior border of the 
fifth plate to project into it—the fifth plate elliptical above, and pre- 
senting four faces at its lower border for articulation with as many 
border plates: first lateral plate nearly triangular, connected with 
the first five marginal plates, the two middle lateral plates form ob- 
long squares, with each an acute angle above entering between the 
sutures of the vertebral plates,—the last or fourth plate is pentagonal. 
Marginal plates twenty five in number,—the nuchal plate pyra- 
in form, with a deep notch on either side of its apex, its pos- 
terior margin being marked with two transverse depressed lines, the 
two first marginal ‘plates on either side of the single one are quadri-’ 
lateral and bluntly serrate on the anterior margin, and together with 
the third plate are unusually deep—the three following plates be- 
come abruptly narrowed and slightly emarginate at the inferior bor- 
der—the six posterior plates are again enlarged, nearly square, and 
the two latter plates with each a slight notch on their inferior bor- 
ders. 
Sternum, yellow tinged with red on its outer sides, the central 
portions being figured with irregularly curved black bands interspers- 
ed with interrupted yellow lines; the second plates with each a black 
dot in their centre: the two anterior plates triangular, with their 
