1. DERMATKMYS. 2. PTAUEOl VPUS. 29 



Borre, Bull. Ac. Bel,/. (2) xxviii. p. 110 (18(5!)); Grm/, Suppl. p *)0 



(1870) ; Bocourf, I. c. p. 17, pi. vii. fig. 2 ; lUitivmier, N. JJenksc/ir. 



Schweiz. Ges. Naturw. xxv. p. 152 (1873) ; Gim'th. Biol. C.-Am., 



Bept. p. 10(1885). 

 Enivs berardii, A. Dnm. Cat. Meth. Bept. p. 11 (1851), and Arch. 



Mus. vi. p. i>31, pi. XV. (1852). 

 Dermatemys abiionnis, Cope, I. c. 



berardii, Cope, I. c. ; Gray, Suppl. p. 50. 



salvinii, Graj/, Proc. Zool. Soc. 1870, p. 517, a)}d Suppl. p. 50. 



Chloremys abnormis. Gray, Proc. Zool. Soc. 1870, p. 716, pi. xlii., and 



Suppl. p. 50. 



Carapace of adult vermiculated, keellcss, or with a veiy obtuse 

 keel posteriorly ; of young keeled throughout ; posterior margin 

 expanded, not serrated ; vertebral shields much broader tlian 

 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 foiirth 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 lamellae. 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. 



0. Salvia, Esq. [P.]. 



(Type of D. salvinii. ) 

 Science & Art Depart. [P.]. 

 Lieut. Maw [P.]. (Type. ) 



2. STAUKOTYPUS. 



Staurotypus, Waql. Syst. Amph. p. 137 (18.30) ; Gray, Cat. Sh. Bept. 



i. p. 47 (1855) ; Strauch, Chelon. Stud. p. 37 (1862) ; Gray, 



Suppl. Cat. Sh. Bept. i. p. 65 (1870) ; Bocourt, Miss. Sc. Me.v., 



Bept. p. 21 (1870). 

 Staurotypus, part., Dunt. Sr Bibr. ii. p. 354 (1835). 

 Kinosternon, part.. Gray, Cat. Tort. p. 34 (1844). 

 Staurerays, Gray, Prod Zool. Soc. 1864, p. 127, and Suppl. Cat. Sh. 



Bept. 1. p. 65. 

 Claudius, part., Cope, Proc. Ac. Philad. 1872, p. 23. 



Carapace much depressed, tricarinate ; marginal shields, ojie 

 azygos nu.chal and 11 pairs. Plastron narrow, cnicif)rm, angular 

 posteriorly, articulating with the marginals by suture, anterior 



