90 TESTUDJNrOiE. 



pendent, not hooked, forming an oi)cn notch mcsiallj- ; ulveolur 

 surlacc of U|»])cr jaw narrowing towards tlie symphysis; the width 

 of the mandible at the symphysis equals or a Htlle exceeds the 

 horizontal diameter of the orbit. Limbs stout, tubercular rather 

 than scaly. Tlie tail measures about two fifths tlic length of the 

 carajmce in the male, less in the female; a low dorsal crest of 

 enlar^od compressed scales on the postanal part of the tail. Cara- 

 pace olive, with black concentric lines, or uniform blackish; plastron 

 yellowish or reddish, blotched, speckled, or vermiculated with black, 

 or with black concentric lines. Soft parts grey, spotted or vermi- 

 culated with black. 



Length of shell 17 centim. 



Salt-marshes of Atlantic coast of Xorth America, from Now York 

 to Texas. 



a. S, spir. N. America. Smithsonian Institution. 



hf c. 6 2 > ^P"'- ■^^- America. 



d, e,f. Ad., stffd. N.America. Gen. Hardwicke [P.]. 



ff. Ad., stffd. N. America. Lord Derby [P.]. 



/t, i, k. Ad., skels. N. America. 



/. Yg., shell. N.America. (Type of \av. tuherculifera.) 



7)1, n, 0. Ad. & hgr., shell. N. America. 



2. Malacoclemmys geographica. 



Testudo geographica, Lesueur, Journ. Ac. Fhilad. i. p. 80, pi. v. 



(1817) ; Leconte, Ann. Lye. N. Y. iii. p. 108 (1830). 

 Emys geographica, Say, Journ. Ac. Pkilad. iv. p. 204 (1825) ; Holhr. 



N. Am. Kerp. i. p. 99, pi. xiv. (1842); I>e/.Y/y, Faun. N. Y., 



Jiept. p. 18, pi. iv. fig. 7 (1842) ; Gray, Cat. Tort. p. 21 (1844), 



and Sh. liept. i. p. 28 (1855). 

 Terrapene geographica, Bona]). Osserv. s. sec. Ml. d. H. A. p. 156 



(1830). 

 Emys geographica, part., Bmn. <§• Bibr. ii. p. 256 (1835). 



■ megacephala, Jlolbr. I. c. p. 76 ; Gray, Cat. Tort. p. 21. 



labyriuthica, A. Bum. Cat. Meth. Eept. p. 13 (1851). 



Graptemys geographica, Ayassiz, Contr. N. II. U. S. i. p. 436, pi. ii. 



figs. 7-9 (1857) : Gray, Si(ppl. Cat. Sh. Rcpt. i. p. 45 (1870). 

 Clemmvs geogi'apbica, StraucJi, Chelon. Stud. p. 33 (1862), and 



Verth. Schildkr. p. 79 (1865). 

 Malacoclemmvs geographica, Coju', Check-List N. Am. Rent. p. 53 



(1875). 



Carapace tectifonn, the keel obtuse and not tubercular, widening 

 posteriorly, the hind margin but moderately serrated, the posterior 

 marginals not or but very indistinctly notched ; nuchal usually 

 longer than broad ; vcrtebruls 2 to 4 much broader than long, as 

 broad as or a little narrower than costals ; shields smooth or feebly 

 striated. Plastron obtusely angulated laterally; the length of the 

 hind lobe but little greater than the width of the bridge ; the longest 

 median suture is thut between the abdominal shields, which nearly 

 equals that between humerals and pectorals ; axillary and inguinal 

 large. Head large; snout short and obtusely pointed; alveolar 



