CATALOGUE OF SHIELD REPTILES. 



29 



the obscure rounded keel on the first, and the sharp keel 

 on the two hinder vertebral keels, are very peculiar, and 

 the manner in which the rings are marked on the marginal 

 plates is unhke any of the other American Etmjdes I have 

 seen, except E. pseudogeoyraphica and geof/raphica. 



The figure of Emys Mobilensis {Holhrook, N. A. Herpet. 

 i. t. 9) somewhat rejjresents this species, as far as regards 

 the distribution of the colours of the costal shields (they are 

 more definite than in our specimen), but the pattern on 

 the upper and under sides of the marginal shield is entirely 

 unlike, as the rings or spots are represented as being on 

 the suture, half the spots being on each shield, as in the 

 more common form of American Emydes. But in this 

 respect, Dr. Holbrook's artist is not to be depended on, as 

 he represents Emys geographica distinctly, and pseudogeo- 

 graphica indistinctly, as having the rings of the same form, 

 which authentic specimens show to be an error. 



Dr. Holhrook represents the head, neck, throat and feet 

 of Emys Mobilensis as having broad yellow hues, the two 

 central throat hues being united near the chin. 



§§ The dark areola and ring are in the upper hinder mar- 

 gin ofthefrst, and gradually lower in the second and 

 third, so as to be in the lower hinder margin of the 

 fourth or last costal shield, and on the hinder margin 

 of all the vertebral plates. 



There is generally a smaller dark spot in the centre of 

 the other rings, formed by the netted lines, as ou the front 

 lower edge of the first and second costal, and on the sides 

 of the vertebral plates. 



26. Emys geographica. The Geographic Emys. 



Shell ovate, convex, smooth, tubercularly keeled in front 

 and slightly toothed behind, olive-brown, with black-edged 

 anastomosing pale lines ; first and fifth vertebral plates 

 broad, five-sided, rest broad, six-sided. Sternum yellow; 

 shields blackish-edged ; under side of the marginal plates 

 ohve, with rather concentric, black-edged, broad and narrow 

 pale lines. Head and feet with numerous yellow lines, and 

 a triangular yellow streak on each temple. 



Emys geographica, Lesueur,Journ.Acad.N.S.Philad.i.S& 

 t. 5. 



Leconte, Ann. Lye. N. Y. iii. 108. 



Gray, Cat. Tort. B.M. 2\. 



Bum. ^-Bib. Erp. Gen. ii. 256 ; Cat. Meth. R. 9. 



Say, Journ. Acad. Philad. iv. 204, 215. 



Harlan, liept. "6. 



Holhrook, jS\ A. Herpet. i. 99. t. 14. 



DeKay, New York, 18. t. 4. f. 7. 



E. Lesueurii, Gray, Syn. Rept. 31. 



Terrapene geographica, Bonap. Obs. Cuv. R. A. 156 (1830). 

 Testudo geographica, Leconte, Ann. Lye. N. Y. iii. 108. 

 Emys megacephala, Holbrook, N. A. Herpet. i. 51. t. 3. 



Gray, Cat. Tort. B.M. 21. 

 E. geographica. Bum. Cat. Meth. R. 9. 



Hab. North America ; New York ; Wabash River ; 

 Cumberland River; Tennessee (Troost). 



a. Half-grown (animal dry, from spirits). Head small. 

 North America. 



Emys Lesueurii, Gray, Syn. Rept. 31. 



The Museum specimen is in a bad state ; it chiefly difi'ers 

 from E. pseudogeograjihica in the keel not being nodose, 

 the vertebral plates very broad and short, and in the pale 

 reticulations being finer. 



It may be distinct from the E. geographica or mega- 

 cephala of Holbrook (which is represented by the same 

 figures) ; and perhajjs it would have been better to retain 

 for it the name under which I first described it. 



Dr. Holbrook represents the head of E. geographica as 

 large (that may be sexual), with numerous regular green 

 lines, an oblong elongated spot on each side of the nape, 

 and an eyed spot on each side of the throat, near the angle 

 of the mouth. 



27. Emys pseudogeogi-aphica. The Sharp-b.^cked 

 Emys. 



Shell elongate-ovate, nicked in front, toothed behind ; 

 vertebral keel tubercular, very distinct, netted with nume- 

 rous yellow lines, with a ring surrounding a dark spot on 

 the hinder edge of the costal and marginal shields, and 

 three smaller spots on the vertebral plates. Sternum \el- 

 low, darker clouded, darkest in the young. Head small, 

 oval, brown, with numerous yellow Unes and a yellow sjiot 

 on and across each temple. 



Emys Lesueurii /3, Gray, Syn. Rept. 31. 



Emys, Lesiieur, Mem. Mus. xv. 267 (1827). 



Testudo geographica, var., Lesueur, Ann. Lye. N. H. N Y 



iii. 110 (1836). 

 Emys pseudogeographica, Lesueur, MSS. 



Holbrook, N. A. Herpet. i. 103. t. 15 (lines on mar- 

 ginal plates rugose). 



BeKay, 29. t. 2. f 3. 

 E. geographica, jun.. Bum. ^- Bib. Erp. Gen. ii. 256. 



Holbrook, X. A. Herpet. i. 103. t. 15 (1842). 

 E. geographica, var., Gray, Cat. Tort. B.M. 



Hab. North America ; Wabash Rirer. 



a. Adult (stuffed). Neck, temples and lips wiih broaa, 

 distinct vellow streaks. North America. Presented 

 by Dr. J. E. Gray. 



E. geographica a. Gray, Cat. Tort. B.M. 



