50. CLEMMYS oS 
d.—Inguinal plates not wedged in between abdominals 
and marginals; no definite longitudinal light bands 
on head, neck, limbs, or tail; no definite dark 
blotches on marginals. 
Clemmys.—p. 973. 
d’.—Inguinal plates more or less wedged in between 
abdominals and marginals; definite longitudinal 
light bands on head, neck, limbs and tail; definite 
dark blotches on upper and lower surfaces of mar- 
ginals. 
Pseudemys.—p. 978. 
c.—Suture between abdominal plates about twice length 
of suture between pectorals; inguinal plates wedged 
in between abdominals and marginals. 
Chrysemys.—p. 980. 
Feet club-shaped, not webbed; one supracaudal plate; 
skin on top of head divided into scales. 
Gopherus.—p. 986. 
a.—Plastron hinged, closing against carapace when head and 
limbs are redrawn. 
b. 
Terrapene.—p. 984. 
Genus 50. Clemmys 
Clemmys Ritgen, Nova Acta Acad. Leopold—Carol., Vol. 14, Pt. 1, 
1828, p. 272 (type, punctata=guttata). 
Chelopus Ra¥inesQuE, Atlantic Journal, 1832, p. 64. 
Actinemys Acassiz, Contr. Nat. Hist. U. S., Vol. I, 1857, p. 444 (type 
marmorata). 
The shell is broad and low. The plastron is immovably 
united to the carapace by a broad bridge. There is no median 
ridge on the alveolar surface of the upper jaw parallel to 
the cutting edge. The internal openings of the nostrils are 
between the eyes. The fingers and toes are webbed. The 
skin on top of the head is not divided into scales. There are 
two supracaudal plates. The tail is moderate or long. 
