﻿Notice of Dr. MantelVs Medals of Creation. 121 



3. In the tertiary above the chalk, dicotyledonous trees are 

 frequent, Cycadeae are rare, ferns not numerous, and Coniferae 

 more common ; corresponding with the general features of our 

 continental floras. In the secondary formation, the grasses are 

 almost entirely absent. 



Fossil Zoology. — The recent species of animals exceed 

 100,000, while those found fossil scarcely amount to 10,000, but 

 still the latter comprise most of the classes and families, and ma- 

 ny of the genera and species of the existing animal races. 



The divisions adopted by Dr. Mantell are 



I. Infusoria, or animalcules. 



II. Zoophytes, including, 1. Amorphozoa, or animals with 

 irregular forms. 2. Polyparia, or coral animals. 



III. Echinodermata, animals with a spiny skin, comprising 



1. Crinoidea, or lily-shaped animals. 



2. Asteria, or star-fishes. 



3. Echinhxs:, or sea-urchins. 



IV. Mollusca, (animals with soft bodies, ) including shell-fishes. 



1. Bivalves ; the Brachiopoda and Lamelli-branchia. 



2. Univalves ; the Gasteropods. 



3. Chambered Shells ; the Cephalopods, including the 



testaceous genera, and those destitute of shells, as 

 the Sepiadce, or cuttle-fish. 



V. Articulate, (having external jointed cases or skeletons,) 

 comprising 



1. Cirripedia ; as the barnacle. 



2. Annelata, or red-blooded worms. 



3. Insectje, or insects ; and Arachnidce, or spiders. 



lobsters. 



a 



fishes 



VII. Reptilia, or reptiles. 



VIII. Aves, or birds. 



IX. Mammalia, (animals giving suck.) 



That the microscopic animalcules of our waters should be 

 found fossil, forming hills and the subsoil of large districts, and 

 that colossal monuments should be constructed by man of the 

 mineralized remains of animalcules invisible to the naked eye, 

 is not more wonderful than true. 



Vol. xlviii, No. 1. — Oct.-Dec. 1844. 16 



