1. DERMATEMYS.—2. STAUROTYPUS. 99 
Borre, Bull. Ac. Belg. (2) xxviii. p. 116 (1869); Gray, Suppl. p 50 
(1870) ; Bocourt, l.c. p. 17, pl. vii. fig. 2; Riitimeyer, N. Denkschr. 
Schweiz. Ges. Naturw. xxv. p. 152 (1873); Giinth. Biol. C-Am., 
Rept. p. 10 (1885). 
Emys berardii, A. Dum. Cat. Méth. Rept. p. 11 (1851), and Arch. 
Mus, vi. p. 231, pl. xv. (1852). 
Dermatemys abnormis, Cope, J. c. 
berardii, Cope, l.c.; Gray, Suppl. p. 50. 
salvinii, Gray, Proc. Zool. Soc, 1870, p. 517, and Suppl. p. 50. 
Chloremys abnormis, Gray, Proc. Zool. Soc. 1870, p. 716, pl. xlii., and 
Suppl. p. 50. 
Carapace of adult vermiculated, keelless, or with a very obtuse 
keel posteriorly ; of young keeled throughout ; posterior margin 
expanded, not serrated; vertebral shields much broader than 
long and broader than the costals in the very young, longer than 
broad and much narrower than the costals in the adult; anterior 
border of second to fourth vertebrals straight transverse in the 
young, convex or obtusely angular in the adult. Plastron with the 
lobes rather narrow and much shorter than the bridge ; front lobe 
rounded, hind lobe angularly notched; gular shield often single or 
semi-divided, longer than broad, sometimes with a small azygos 
shield behind it; four or five inframarginal shields, first (axillary) 
smallest, last (inguinal) largest. Head moderate; snout pointed, 
very prominent, turned upwards. Digits webbed beyond the base 
of the claws, the web forming a much developed fringe on the outer 
edge of the hand and foot; limbs with widely separated narrow 
transverse lamelle. Tail extremely short, with two rows of conical 
tubercles above and one on each side. Olive above, yellowish in- 
feriorly ; sides of head speckled with blackish. 
Length of shell 38 centim. 
Tabasco, Yucatan, Guatemala, Belize, Honduras. 
GoD Spl: Guatemala. O. Salvin, Esq. [ P.]. 
(Type of D. salvinii.) 
b. Ad., shell. Honduras. Science & Art Depart. [ P.]. 
c. Ad., shell. 
; Lieut. Maw[P.]. (Type.) 
d. Ye., skel. —? 
2. STAUROTYPUS. 
Staurotypus, Wagl. Syst. Amph. p. 137 (1830); Gray, Cat. Sh. Rept. 
i. p. 47 (1855); Strauch, Chelon. Stud. p. 37 (1862); Gray, 
Suppl. Cat. Sh. Rept. i. p. 65 (1870) ; Bocourt, Miss. Se. Mev., 
Rept. p. 21 (1870). 
Staurotypus, part., Dum. § Bibr. ii, p. 854 (1835). 
Kinosternon, part., Gray, Cat. Tort. p. 34 (1844). 
Stauremys, Gray, Proc. Zool. Soc. 1864, p. 127, and Suppl. Cat. Sh. 
Rept. 1. p. 65. 
Claudius, part., Cope, Proc. Ae. Philad. 1872, p. 25. 
Carapace much depressed, tricarinate; marginal shields, one 
azygos nuchal and 11 pairs. Plastron narrow, cruciform, angular 
posteriorly, articulating with the marginals by suture, anterior 
