[page] 4

Mr. James Reid read some notes on several quadrupeds, also from the collection of Mr. Darwin, including a new species of Opossum, which he characterized as Didelphis hortensis*. He also noticed a very young specimen of the Viscache, Lagostomus trichodactylus of Brooks. This example, not much larger than our common Rat, differs from the adult in wanting the ridge of stiff black hairs over the eyes so conspicuous in old sapecimens, and in wanting also the grooves on the teeth.

* The characters of species newly described which have not yet been furnished by the respective authors, and are therefore necessarily omitted, will be inserted, if subsequently sent in, at the termination of the volume.