As the _luteo-album_ is said to grow in New-England, yet so far as my observation has extended it has not been found by any of the botanists, I am induced to believe that this opinion has arisen from some erroneous description of the plant which is the subject of this paper. As the decurrent leaves of this Gnaphalium distinguish it so obviously from all the other American species of Gnaphalium, I propose to give it the specific name of _decurrens_. _Specific description of Gnaphalium Decurrens (large life everlasting.)_ Leaves lanceolate, broad at base, acute, decurrent, somewhat scabrous above, tomentose beneath; stem leafy branched spreading, about three feet high.--See the plate.--The plate represents a section of the upper part of the plant. FOSSIL ZOOLOGY, &c. ART. XII. _Observations on some Species of Zoophytes. Shells, &c. principally Fossil, by_ THOMAS SAY. If the following descriptions and notices of some of the animal productions of our country, chiefly fossil, and of which some are but little known, should be found of sufficient interest to occupy a place in the Journal of Science, they are very much at your service for that work. The greater portion of them are extracted, with some modification, from an essay which I read about three years ago, to the Academy of Natural Sciences, without any intention at the time of giving publicity to them. But the rapid diffusion of a taste for geological research, seems to require corresponding exertions on the part of those who have attended to fossil remains, inasmuch as geology, in order to be eminently furnished with every advantage that may tend to the developement of many important results, must be in part founded on a knowledge of the different genera and species of reliquiæ, which the various accessible strata of the earth present. The accessory value of this species of knowledge, is now duly estimated in Europe, as affording the most obvious means of estimating, with the greatest approximation to truth, the comparative antiquity of formations, and of strata, as well as of identifying those with each other which are in their nature similar. Certainly very little is yet known about the fossils of North America, and very little can be known accurately, until we shall have it in our power to compare them with approved detailed descriptions, plates, or specimens of those of Europe; which have been made known to the world by the indefatigable industry, and scientific research of Lamarck and other naturalists.