HERPETOLOGY OF JAPAN. 489 



Eacli of these genera is represented in the territory here included b}^ 

 a single species only, which may Ix' more conveniently identified by 

 the following: 



AR'I'IFK'IAL KKY. 



a' Playtron eniaiginate behind. 



6' Axillary and inguinal shields present : upper jaw not, hooked, 

 c' Whole top of head smooth. 



d} Sides of head with numerous narrow longitudinal yellowish stripes; ^lastron 



yellow, each shield with a large brown blotch Oca«lia sinensis, p. 489. 



d~ Head nearly uniformly colored: plastron mainly black. 



Clnnmys japnnica, p. 492. 

 c- Posterior half of top of head witli skin divided into small shields. 



Gcoclcmys reevesii, p. 497. 



b- No inguinal sliield; upper jaw strongly hooked Gcoemijda spengleri, p. 501. 



a- Plastron rounded liehind Cydeinys flavomarginatn, p. 503. 



Genus OCADIA " Gray. 



1870. Ocadia Gray, Suppl. Cat. Shield Re])r. Brit. Mus., I, p. 35 (type, Emy.-i 

 sinensis). 



Only a single species of tliis genus is known. 



OCADIA SINENSIS Gray. 

 Plate XXVIII. 



1834. Emys sinensis Gray, Proc. Zool. Soc. London, 1834, p. 53 (type-locality, 

 southern China; type in Brit. Mus.; J. Reeves, collector); Cat. Shield 

 Rept. Brit. Mus., I, 1855, p. 21, pi. vii (Canton, China).— Swinhoe, Ann. 

 Mag. Nat. Hist. (3), XII, 1863, p. 219 (Taiwan fu, Formosa).— Guenther, 

 Rept. Brit. India, 1864, p. 27 (south Formosa).— Ocac/ia sinensis Gray, 

 Suppl. Cat. Shield Rept. Brit. Mus., I, 1870, p. 35; Proc. Zool. Soc. Lon- 

 don, 1873, p. 192 (skull, figure).— Boulenger, Cat. Chel. Brit. Mus., 

 1889, p. 85 (Canton; Formosa).— Boettger, Kat. Rept. Mus. Sencken- 

 berg., I, 1893, p. 4 (Takao, Formosa).— Stejneger, Journ. Sci. Coll. 

 Tokyo, XII, Pt. 3, 1898, p. 225 (Taipa, Formosa). 



1844. Emys henneitii Gray, Cat. Tortois. Brit. Mus., p. 21 (type-locality ^- North 

 America?"; type in Brit. Mus.); Cat. Shield Rept. Brit. Mus.', I, 1855, 

 p. 22, pi. x& (China?); Proc. Zool. Soc. London, 1863, p. 176 (identity 

 with E. sinensis). — Sclater, Proc. Zool. Soc. London, 1862, p. 151 



1870. Ennjs chinensis Gray, Suppl. Cat. Shield Rept. Brit. Mus., I, p. 28 (emended 

 name). 



Description. — Young, probably second year; Science College 

 Museum, Tokyo, No. 29; Taipa, Formosa; September, 1,S96; T. 

 Tada, collector (figs. 377-381). Snout conical, projecting, vertical 

 profile oblique, straight; edges of jaws not denticulated, u])per jaw 

 without median or lateral hooks, distinctly notched mesially; tritu- 

 rating surface of upper jaw with a longitudinal ridge near the inner 

 edge; mandibular symphysis less than length of eye slit; skin on 



a A coined word without meaning. 



^ Lower figure reproduced in this work on Plate XXVIII. 



