108 TESTUDINID &. 
region, with a permanent obtuse keel; posterior border serrated ; 
shields with strong radiating and concentric strie ; 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. 
a. 9, stffd. Pensylvania. 
6, ¢. 3 9, skel. Pensylvania. 
d. 2, spir. N. America. Capt. J. Anderson [P.]. 
e, f. d, skel. N. America. 
g. 2, shell. N. America. 
6. Clemmys muhlenbergii. 
Testudo muhlenbergii, Schoepff, Test. p. 152, pl. xxxi. (1792) ; Leconte, 
Ann. Lye. N. Y. iii. p. 119 (1830). 
Emys muhlenbergii, Schwegg. Prodr. p. 41 (1814); Dum. § Bibr. 
ii. p. 804 (1835) ; Holbr. N. Am. Herp. i. p. 46, pl. iv. (1842) ; 
Dekay, Faun. N. Y., Rept. p. 17, pl. viii. tig. 15 (1842); Gray, 
Cat. Tort. p. 20 (1844). 
biguttata, Say, Journ. Ac. Philad, iv. p. 212 (1824). 
Terrapene muhlenbergii, Bonap. Osserv. s. sec. Ed, d. R. A. p. 160 
1830). 
Gis muhlenbergii, Gray, Cat. Sh. Rept. i, p. 19 (1855), and 
Suppl. p. 27 (1870). 
Calemys muhlenbergii, Agassiz, Contr. N. H. U.S. i. p. 443 (1857). 
Clemmys muhlenbergii, Strauch, Chelon. Stud. p. 32 (1862), and 
Verth. Schildkr. p. 67 (1865). 
Chelopus muhlenbergii, 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 very 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 
