The naturalists drew up a paper on the "Probable Extinction of the Crotalus Durissus in the Township of Rockland."

It was one of those reptiles well-known by the noise they make, a rattlesnake of the most venomous species: a giant of the Crotalus family!

We, too, are frightened, for we hear the dreaded rattle of the crotalus!

The South American rattlesnake-theBoaquira crotalus horridus-hasthe rattle placed at the end of the tail.

There was a fair illustration of the matchless agility of the crotalus when he cares to be quick.