MY DEAR SIR,—The collection of fossils from the Sombrero Key, which you kindly placed in my hands for examination, comprises the remains of birds, turtles, and Saurian reptiles. Those of the first, and from the more superficial deposit, appear to belong to existing species of sea-birds now found along the coast, and have undergone no change. The following comprises a list of such specimens as are sufficiently well preserved to be identified. There are many other specimens, but they are so much broken that I have not been able to determine them. Specimens numbered from 1 to 11 inclusive are bones of turtles, and those from 1 to 11 inclusive are all from the same, viz., the middle, deposit.1