which is fuscous, posterior half of carince are also of the same 

 color, with a white, central, longitudinal line running along the 

 centre. Angles, which are rounded in the adult, acute in the 

 young shell, somewhat everted, pale, purplish brown. Shell 

 translucent. 



Length, 2^ inches. Breadth, 1| inches. Aperture: length, 

 2 inches ; width, 1^ inches. 



Dr. Kneeland also presented, in the name of Dr. 

 Parkinson, an uncommonly large and perfect shell of 

 Nautilus pompilius, very much larger than any in the 

 Society's cabinet. 



Also, a very curious insect from the Sechelles Islands, 

 called the " leaf-fly," or the " fly-leaf," " la mouchefeuilley 

 He read the following description of the insect from the 

 " Mauritius Watchman," of the 8th of January, 1845: — 



" Among the insects of this Archipelago, none is more re- 

 markable than the mouche-feuille, as it is very appropriately 

 named. The male and female insects differ considerably in 

 appearance ; and it is the latter only which deserves the fore- 

 going title. The male is about an inch and a half long, and 

 possesses some slight resemblance to a grasshopper in the form 

 of the head and horns, nor is the body unlike that of that insect. 

 The wings are of an exceedingly weak gauze-like texture, of a 

 very pale green color, and are rather shorter than the body. Their 

 powers of motion are extremely limited, being confined, as far as 

 our observation has extended, to a slow and feeble walk. We 

 have never seen them attempt to fly, nor do they aj^pear to 

 possess any instinct of danger. 



"They delight principally in the Badamier, a tree which 

 flourishes remarkably well at Sechelles. To the leaf of this, 

 the female insect bears a most astonishing resemblance. The 

 entire length is from an inch and a quarter to two inches, and the 

 breadth in the widest part about an inch and a quarter. The 

 head might easily be mistaken for the broken stalk of the leaf, 

 to which the neck bears a "perfect resemblance. The wings 

 present the exact form and color of the young leaf, and the veins 



