108 TESTUDINID^. 



region, with a permaaeut obtuse keel ; posterior border serrated ; 

 shields with strong radiating and concentric striae ; nuchal very- 

 narrow, almost linear ; first vertebral not broader in front than 

 behind ; vertebrals 2 to 4 as broad as or a little narrower than the 

 costals.' Plastron large, concave in the male, angularly emarginate 

 posteriorly ; the width of the bridge but little less than the length 

 of the hind lobe; abdominal shields larger than pectorals; the 

 longest median suture is that between the abdominals, which, how- 

 ever, may be equalled by that between the anals ; the shortest that 

 between the humerals ; axillary small, inguinal often absent. Head 

 moderate ; snout not prominent ; upper jaw bicuspid and notched 

 in the middle ; the width of the mandible at the symphysis nearly 

 equals the horizontal diameter of the orbit. Digits short, shortly 

 webbed. Tail about one third the length of the shell in the female. 

 Carapace blackish, with radiating yellow lines ; plastron and lower 

 surface of marginals yellow, each shield with a large black blotch. 

 Soft parts dark brown or olive, sides of head speckled with red. 



Length of shell 18 centim. 



N.E. United States, from Maine to Pensylvania and N. Jersey. 



fl. 5 , stffd. Pensylvania. 



b,c. (5' ? , skel. Pensylvania. 



t?. 5,spir. N.America. Capt. J. Anderson [P.]. 



f,/.d,skel. N. America. 



g. $ , shell. N. America. 



6. Clemmys muhlenbergii. 



Testudo muWenbergii, Schoepf, Test. p. 132, pi. xxxi. (1792) ; Leconte, 



Ann. Life. N. Y. iii. p. 119 (1830). 

 Emys muhlenbergii, Schiceu/fi. Prodr. p. 41 (1814) ; Dmn. Sf Bihr. 



ii. p. 304 (1835) ; Holhr. N. Am. Herp. i. p. 45, pi. iv. (1842) ; 



Dekaii, Faun. N. Y., Rcpt. p. 17, pi. viii. tig. 15 (1842) ; Gray, 



Cat. Tort. p. 20 (1844). 



biguttata, Say, Juurn. Ac. Philad. iv. p. 212 (1824). 



Ten-apene muhlenbergii, Bonap. Osserv. s. sec. Ed. d. R. A. p. 160 



(1830). 

 Geoclemys muhlenbergii, Gray, Cat. Sh. Itept. i. p. 19 (1855), and 



Supply. 27 (1870). 

 Calemys muhleubergiij Agassiz, Contr. N. H. XJ. S. i. p. 443 (1857). 

 Clemmys mublenberaii, Strauch, Chelon. Stud. p. 32 (1862), and 



Verth. Sehildh: p.^67 (1865). 

 Chelopus mubleubergii, Cope, Check-List N. Am. Rept. p. 53 (1875). 



Closely allied to the preceding, but shell more convex, often with 

 distinct areolations in the adult ; vertebral shields 2 to 4 as broad 

 as or a little broader than the costals ; plastral bridge a little 

 broader, as long as the longitudinal suture between the femoral and 

 anal shields. Upper jaw with a cusp on each side of the median 

 notch. Digits and claws very short ; web veiy indistinct. Cara- 

 pace dark brown, with yellowish or pale brown blotches or radiating 

 lines ; plastron blackish on the sides and behind, yellowish or pale 

 brown in front and in the middle ; head dark brown above, with or 



