270 TRIONYCHID &. 
Ind. p. 46 (1864); Blanf. Journ, As, Soc. Beng. xxxix. p. 343 
(1870); Theob. Cat. Rept. Brit. Ind. p. 82 (1876); Lydekker, 
Pal. Ind. (10) iii. p. 197, pl. xxvi. fig. 1 (1885). 
Emyda ceylonensis, Gray, Cat. Sh. Rept. i. p. 64, pl. xxix. a (1855) ; 
Giinth. l. c. p.45; Gray, Suppl. Cat. Sh. Rept.i.p. 117 (1870), and 
Ann. & Mag. N. H. (4) xi. p. 807 (1878). 
Under this name may be provisionally grouped such specimens 
as agree with Z. granosa except in the uniform brown colour of 
the upper parts (with or without darker bands on the head and 
neck) and usually in the larger entoplastral and xiphiplastral 
callosities. The constancy of and the correlation between these 
characters, however, still require to be tested upon a larger number 
of specimens. 
Ceylon, India. 
a, Ad., shell. Ceylon. Dr. Kelaart. (Type of 
E. ceylonensis.) 
b, e-d. Yg., spir. Ceylon. 
e-h, Ad. & yg., spir. 2 
Lord Arthur Russell [P. ]. 
3. Emyda scutata. 
Emyda scutata, Peters, Mon, Berl. Ac. 1868, p. 449; Theod. Cat. 
Rept. Brit. Ind. p. 32 (1876); Anders, An. Zool. Res. Yunnan, 
p. 779, pls. Ixxiv., lxxy., & Ixxy. a. figs. 12-16 (1879). 
fuscomaculata, Gray, Ann. § Mag. N. H, (4) xi. p. 808 (1878). 
Very closely allied to Z. granosa and £. vittata, but anterior 
marginals less enlarged, less unequal in size, the first not larger than 
the second. Entoplastral callosity large or moderate. Brown 
above, carapace spotted or reticulated with darker. 
Burma. 
a-d, Ad., hgr., & yg., Rangoon, M. L. Fea [C.]. 
spir. 
e. Yg., spir. Pegu. W. Theobald, Esq. ([C.]. (Type 
of E. fuscomaculata.) 
Jt. Yg., spir. Pegu. W. Theobald, Esq. [C. ]. 
g,h. Ad. & yg., shells. Burma. W. Theobald, Esq. [P.]. 
6. CYCLANORBIS. 
Cryptopus, part., Dum. § Bibr. ii. p. 499 (1835). 
Cyclanorbis, Gray, Proc. Zool. Soc, 1852, p. 189. 
Cyclanosteus, Gray, Proc. Zool. Soc. 1855, p. 201, and Suppl. Cat. 
Sh. Rept. i. p. 111 (1870), and Proc. Zool, Soc. 1873, p. 70. 
Cyclanosteus, part., Gray, Cat. Sh. Rept. i. p. 64 (1855). 
Cycloderma, part., Strauch, Chelon. Stud. p. 55 (1862). 
Tetrathyra, Gray, Proc. Zool. Soc. 1865, p. 823, and Suppl. Cat. Sh. 
Rept. i. p. 109, and Proce. Zool, Soc. 1873, p. 70. 
Baikiea (non Gray, 1865), Gray, Suppl. Cat, Sh. Rept. i. p. 114, and 
Proc. Zool. Soc. 18738, p, 69. 
Nuchal not notched at the outer ends, which extend slightly 
below the first costal plate; a prenuchal bone (absent in the 
young); neural plates forming an incomplete series, some or all of 
