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Show 1882.] DR. A. GUNTHER ON A NEW TORTOISE. 343 colours, the male seemed to have the lazuline blue of the throat carried entirely over the breast, instead of being confined to the throat. Mr. Sclater laid before the Meeting the skins of the two specimens of the Subcylindrical Hornbill (Buceros sub cylindricus), which had been formerly living in the Society's Gardens1, and stated that a reexamination of these specimens had confirmed his opinion as to the validity of the species. In the second specimen, which had died on the 9th June 1881, although the tail was imperfect, it was manifest that the two central tail-feathers were black almost to their tips as in the first specimen; and the well-defined ashy margins of the feathers on both sides of the head were alike in both examples. It was likewise of great interest to find that an example of this Hornbill had been recently received by the Imperial Museum of Vienna2 in a collection made by Dr. Emin Bey between Lado and the Albert Nyanza in Central Africa, so that we were now acquainted with the true locality of this rare species. Mr. Sclater proposed to arrange for the deposit of these typical specimens in the British Museum. The following papers were read :- 1. Description of a new Species of Tortoise {Geoemyda impressa) from Siam. By Dr. A . G U N T H E R , V.P.Z.S. [Received March 20, 1882.] The British Museum has received from Siam the shell of a fresh water Turtle without any other part of the animal, which seems to be undescribed. It is 11 inches long; and sufficiently resembles the shells of Geoemyda spinosa and G. grandis to warrant tbe supposition that this species belongs to the same genus. It may be named Geoemyda impressa, from the peculiar shape of the principal upper plates, which are not merely flat, but distinctly concave. The shell is much depressed and broadly flattened above. Its anterior margin is deeply excised in front of the nuchal plate, and serrated ; also the lateral marginals project slightly at their posterior corners, and the hind margin is deeply and regularly serrated. The plates are nearly smooth ; but concentric striation is distinct, especially on the costals. Of a vertebral keel the faintest possible trace is visible on the fourth or fifth vertebral. The sternum is excised in front, and deeply notched behind ; its width between the front 1 See P. Z. S. 1870, p. 668, pl. xxxix.; 1871, p. 489, and 1879, p. 550. - Cf Von Pelzeln, " Ueber eine Sendung von Vogeln aus CentrabAfrika," Verb. k-k. zool.-bot. Gesellsch. Wien, 1881, p. 153. |