. Anatomical and zoological researches: comprising an account of the zoological results of the two expeditions to western Yunnan in 1868 and 1875; and a monograph of the two cetacean genera, Platanista and Orcella. 718 EEPTILIA. Plain, near Tezpur, in Assam, close to the Brahmaputra; but any way, the generic term Chaihassia selected by Theobald is an unfortunate one. Theobald referred this new sub-genus and Geoemyda to the family Testudi- nidce, from which, however, their structure markedly separates them; the structure of Geoemyda, also that of Chaihassia, being essentially that of an Emyde.
. Anatomical and zoological researches: comprising an account of the zoological results of the two expeditions to western Yunnan in 1868 and 1875; and a monograph of the two cetacean genera, Platanista and Orcella. 718 EEPTILIA. Plain, near Tezpur, in Assam, close to the Brahmaputra; but any way, the generic term Chaihassia selected by Theobald is an unfortunate one. Theobald referred this new sub-genus and Geoemyda to the family Testudi- nidce, from which, however, their structure markedly separates them; the structure of Geoemyda, also that of Chaihassia, being essentially that of an Emyde. An inspection of the specimens from the Bishnath Plain in Assam, and a com- parison of them with Blyth's types of Q. tricarinata, conclusively prove that the two are perfectly distinct species, but generically identical.^ In 1875, I described a tortoise from Arracan, which I referred to the Genus Geoemyda and named G. dejpressa? Mr. Theobald afterwards^ re-described the same species under the name of Geoemyda arakana, from specimens in the Indian Museum, Calcutta. I propose now to consider wherein these species of Geoemyda differ from one another and from Emys, to which they are closely allied, and what the characters are of Chaihassia. I regret that I have no example of G. spinosa to compare with these forms. 1 The animals from tbe Bishnath Plain are distinguished from Chaihassia tricarinata, Bljth, by the very much larger and anteriorly broader first vertebral, the lateral margins of which are widely anteriorly divergent, the posterior border straight and equalling one-half the breadth of the anterior border: the fourth and fifth vertebrals are not so large as in G. tricarinata. In the latter, the gulars are triangular, while, in the Assam species, the external lateral margins of the gulars are rounded. The anal plates of C. tricarinata are decidedly larger than in the Bishnath species, i n which the anal notch is smaller. The form of the shells of the two species is practica
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