| OCR Text |
Show 206 DR. .). E. G R A Y O N T H E T O R T O I S E S . [Mar. 11, the alveolar surface broad, expanded, nearly as broad behind as in front, the centre of the outer edge produced and acute, with a large concavity on each side behind it, and with an irregular sharp-edged ridge nearer the inner edge than the outer margin, with a conical compressed prominence in front; the labial margin with a series of conical teeth. Fig. 15. Pseudemys serrata. A second skull depressed, ovate, sides of the face shelving; nasal aperture very large; orbits very large, superior, separated by a very narrow space; crown rhombic, produced behind; zygomatic arch very broad, convex, nearly as wide as the back edge of the orbit and the front edge of the oval tympanic cavity. Upper jaw with a well-marked irregularly dentated ridge parallel with the outer edge, and a broad flat space behind it; there is a conical tooth on the front end of the ridge, and a deep conical pit on the front of the upper jaw. Hinder nasal opening arched in front, near the middle of the palate. The lower jaw strong, broad, expanded ; lower surface flat; upper surface with a short denticulated marginal edge, and a conical central prominence in front, with a central longitudinal ridge and a stronger arched ridge parallel with the outer margin. Toes long, slender, broadly webbed. 2. PSEUDEMYS DECUSSATA. Pseudemys decussata, Gray, Ann. & Mag. N. H. xii. p. 183. |
