388 
which is fuscous, posterior half of carinæ 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. 
ngth, 2} inches. Breadth, 12 inches. Aperture: length, 
2 inches ; width, 14 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 mouche feuille." 
He read the following description of the insect from the 
* Mauritius Watchman,” of the 8th of January, 1849 :— 
* 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 n 
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 à 
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 appear to - 
possess any instinet of danger. S 
“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 tbe, 
m breadth in the widest part about an inch and a quarter. X. m 
.. head might easily be mistaken for the broken stalk of the leaf, ae 
to which the neck bears a perfect resemblance. The xu: 
esent the exact form and color of the young leaf, and the vems 
