CI.XOSTERXID.T':. 33 



1 . Claudius angiistatus. 



Claudius anjjustatus, Cope. I'roc. Ac. Philad. 1805, p. 187, and Proc. 



Am. Dnius. Son. xi. lS('>i), p]. ix. ; liucourt. I.e. p. 20, pi. iv. ; Cope, 



Proc. Ac. Philad. 1872, p. 28; Giinth. Biol. C.-Am., Rept. p. 12 



(1885). 

 mep:aceplialus, Bocourt, Ann. Sc. Nat. (5) x. p. 122 (1808) ; 



Cope, I*rvc. Ac. Philad. 1872, p. 27. 



Plastron rhomboidal, anterior and posterior lobes angular : a very 

 small g-ular may bo present ; abdominals twice as broad as long ; 

 anals distinct or united. iS'o warts on the neck. 



Length of carapace 105 millim. 



Mexico. 



Fam. 4. CINOSTERNID^. 



Emydidaj, part., Grai/, Ann. Phil. (2) x. 1825. 



Steganopodes, part., If'ar/ler, Si/st. Amph. 1830. 



Eniydae, part., Gray, Si//i. Kept. 18-31 . 



Elodites Cryptuderes, part., Dumeril Sc Bibron, Erp. Gen. ii. 1835. 



Emydida9, part., Gray, Cat. Tort. 1844, and Sh. Rept. i. 1855. 



CinosternidfB, Ayassiz, Contr. N. H. U. S. i. 1857. 



Chersemyda, part., Strauch, Chelan. Stud. 1802, 



Chelydrad.-B, part.. Gray, Sitppl. Cat. Sh. Rept. i. 1870. 



CiuosternidEe, Cope, Proc. Am. Philos. Soc. xx. 1882, p. 144. 



Xuchal plate produced into costiform processes, underlying the 

 marginals. Plastral bones eight, the entoplastron being absent. 

 SheU covered with epidermal shields. Caudal vertebrae proccelous. 

 Xeck completely retractile within the shelL Temporal region not 

 roofed over ; no parieto-squamosal arch. Digits moderately elon- 

 gate ; phalanges with condyles ; claws four or five. 



1. CINOSTERNUM. 



Ten-apene, part.. Men: Tent. p. 27 (1820). 



Kinostemou, Spi.r, Spec. Nov. Testud. p. 17 (1824); Gray, Cat. Tort. 



p. 32 (1844), and Cat. Sh. Rept. i. p. 43 (1855). 

 Kinosteruon, part.. Bell, Zool. Journ. ii. p. 302 (1825). 

 Sternothserus, part., Bell, I. c. p. 305. 

 Cinosternon, Wagler, Si/st. Amph. p. 137 (1830) ; Dum. 8f Bibr. ii. 



p. 3G1 (1835) ; St ranch, Chehn. Stud. p. 39 (1862) ; Bocourt 



Miss. Sc. Me.v., Rept. p. 23 (1870). 

 Uronyx, Ra^n. Atlant. Journ. p. 64 (1832). 

 Diclida, part., Rajin. I. c. 

 Monoclida, RaJin. I. c. 

 Staurotypus, part., Dum. Sj Bibr. ii. p. 354. 

 Swanka, Gray, Cat. Tort, p. 32, and Suppl. Cat. Sh. Rept. i. p. 07 



(1870). 

 Kinosteruum, Leconte, Proc. Ac. Philad. 1854, p. 180. 

 Aromochelvs, Graii, Cat. Sh. Rept. i. p. 46 ; Strauch, I. c. p. 38. 

 Goniochelys, Ayassiz, Contr. N. H. U. S. i. p. 423 (1857). 



