1895.] MK. A. THOMSON^'S BEPORT ON" THE 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 1 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 (fig. 6, p. 136), this fissure appears to 

 be represented by a deep gi'oove posterior to the Sylvian fissure 

 (a in the figui'e). The only other at all conspicuous sulcus upqn 

 the pallium of Dendrolagus is that indicated at h 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 Mucrojpus, Hahnaturus, Petrogale, and — a stronger argument 

 still — in the small and nearly smooth brain of Hiipsiprymnus 

 ogilbyi. 



February 19, 1895. 



Sir W. H. Flower, K.C.B., LL.D., F.E.S., President, 

 in the Chair. 



Mr. Arthur Thomson, the Society's Head Keeper, exhibited a 

 series of Insects reared in the Insect-bouse in the Society's Gardens 

 during the past year, and read the following Report on the subject : — 



Eeport 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. 



