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 subcylindricus), which had 
been formerly living in the Society’s Gardens’, and stated that a re- 
examination 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 Vienna®* 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. Gintuer, 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 the 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, espe- 
cially 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 
' See P. Z. S. 1870, p. 668, pl. xxxix.; 1871, p. 489, and 1879, p. 550. 
2 Of. Von Pelzeln, “ Ueber eine Sendung von Végeln aus Central-Afrika,” 
Verh. k.-k. zool.-bot. Gesellsch, Wien, 1881, p. 153. 
