180 CHELONID®. 
Fam. 7. CHELONIDA. 
Cheloniadxw, Gray, Ann. Phil. (2) x. 1825. 
Cheloniadie, Bell, Zool. Journ, iii. 1828. 
Oiacopodes, part., Wagler, Syst. Amph. 1880. 
Cheloniadee, part., Gray, Syn. Rept. 1851. 
Thalassites, part., Duméril § Bibron, Erp. Gén. ii. 1835. 
Cheloniade, part., Gray, Cat. Tort. 1884, and Sh, Rept. 1, 1855. 
Chelonioidee, Agassiz, Contr. N. H. U.S. i. 1857. 
Chelonina, Strauch, Chelon. Stud. 1862. 
Cheloniade, Gray, Suppl. Cat. Sh. Rept. i. 1870. 
Cheloniadse, Caouanidee, Gray, Proc. Zool. Soc. 1873, p. 895, 
Cheloniidze, Cope, Proc. Amer. Philos. Soe. xx. 1882, p. 148. 
Nuchal plate without costiform processes. Plastral bones nine. 
Shell covered with epidermal shields. Caudal vertebra proccelous. 
Neck incompletely retractile ; cervical vertebrae short, mostly arti- 
culated by amphiarthrosis*. Temple completely roofed over ; 
parietal bone in contact with the squamosal. Limbs paddle-shaped ; 
phalanges without condyles ; claws one or two. 
Marine. 
1. CHELONE. 
Chelonia, part., Brongn. Bull. Soc. Phitom. 11. p. 89 (1800) ; Wagler, 
Syst. Amph. p. 182 (1830); Gray, Syn. Rept. p. 51 (1831) ; Dum. 
§ Bibr. 11. p. 580 (1885). 
Caretta, part., Merrem, Tent. p. 17 (1820). 
Caretta, Gray, Cat. Tort. p. 55 (1844), and Sh. Rept. i. p. 78 (1855) ; 
Girard, U. S. Explor. Exped., Herp. p. 458 (1858) ; Giinth. Rept. 
Brit. Ind. p. 53 (1864) ; Gray, Suppl. p. 118 (1870). 
Chelonia, Gray, Cat. Tort. p. 54, and Sh. Rept. i. p. 74; Agass. 
Contr. N. H. U. S.1. p. 877 (1857) ; Garard, le. p. 452; Grinth. 
le. p. 52; Gray, Suppl. p. 119. 
Eretmochelys (7’tz.), Agassiz, 1. e. p. 580. 
Euchelys, Girard, 1. e. p. 447. 
Chelone, Strauch, Chelon. Stud. p. 59 (1862). 
Mydas, Gray, Suppl. p. 119. 
Onychochelys, Gray, Proc. Zool. Soe. 1875, p. 397. 
Carapace with persisting fontanelles between the costal and 
marginal plates. Costal shields four pairs. An intergular and a 
series of inframarginal plastral shields. 
1. Chelone mydas. 
Testudo mydas, Linn. S. NV. i. p. 350 (1768) ; Schoepff, Testud. p.73, 
pl. xvii. fig. 2 (1792) ; Daud. Rept. ii. p. 10, pl. xvi. fig. 1 (1802). 
macropus, Walbaum, Chelonogr. p. 112 (1782). 
viridis, Schnerd. Schildkr. p. 299, pl. — (1783). 
japonica, Thunberg, Vetensk. Acad. Handi. viii. p. 178, pl. vii. 
fig. 1 (1787). 
cepediana, Dad. 7. e. p. 50. 
Chelonia japonica, Schwergg. Prod. p. 21 (1814). 
* Tn an adult example of Chelone mydas the sixth and seventh centra are 
even anchylosed together. 
