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Show 1895.] MB. A. THOMSON'S E E P O E T O N T H E INSECT-HOUSE. 137 mentioned, even in the smaller Petrogale. Apart from a few furrows to which I shall call attention immediately, the surface of the brain of Dendrolagus is not exactly smooth. It is covered with numerous meandering lines, the imprint of blood-vessels, which I cannot compare with the furrows of the more richly convoluted brain of the Kangaroo. The Sylvian fissure is faintly marked. In the Kangaroo and the Wallaby this fissure is encircled by an arch-like fissure as in the Carnivorous brain. In Dendrolagus, as may be seen by an inspection of the accompanying drawing (tig. 6, p. 136), this fissure appears to be represented by a deep groove posterior to the Sylvian fissure (a in the figure). The only other at all conspicuous sulcus upon the pallium of Dendrolagus is that indicated at b in the drawing (fig. 5). This fissure lies, as will be seen, in the extreme frontal region of the brain and is U-shaped. That this is an important fissure in the Marsupial brain appears to be shown by its presence also in Macropus, Halmaturus, Petrogale, and-a stronger argument still-in the small and nearly smooth brain of Hypsiprymnus ogilbyi. February 19, 1895. Sir W. H. FLOWEB, K.C.B., LL.D., F.R.S., President, in the Chair. Mr. Arthur Thomson, the Society's Head Keeper, exhibited a series of Insects reared in the Insect-house in the Society's Gardens during the past year, and read the following Report on the subject:- Tteport on the Insect-house for 1894. Examples of the following species of Insects have been exhibited in the Insect-house during the past season:- Silk-producing Bombyces and their Allies. Indian. Attacus atlas. Attacus pernyi. cynthia. Anthercea myliita. ricini. American. *Attacus lebeaui. Telea polythemus. Samia cecropia. promethea. Actias luna. Hypochera io. * Exhibited for the first time. |