GENERAL VIEW. 



made up of a longitudinal series of more or less distinctly 

 traceable segments or rings, at least at some period of their 

 lives. Such creatures are all insects, crabs, lobsters, shrimps, 1 

 scorpions, spiders, hundred-legs, earth-worms, and leeches. 

 This sub-division is the richest in numbers of the whole 

 animal kingdom ; and even one class of it, Insecta (which 

 comprises all insects), contains so many species as to exceed 

 in number all other species of animals put together. 



A fourth sub-kingdom is made up of creatures less familiar 

 to many, namely, sea-squirts or ascidians, 2 lamp-shells, and 



FIG. 4. AN ASCIDIAN, OR SEA-SQUIRT 

 (Ascidia). 



FIG. 5. A STAR-FISH 

 ( U raster]. 



FlG. 6, A TUBULARIAN POLY! 



(Bimeria), after Allman. 



minute animals living in compound aggregations, often found 

 on our shores, such as iheJZustra, or sea-mat. To this sub- 

 kingdom the name MOLLUSCOIDA 3 has been applied. 



A fifth sub-kingdom is composed of animals like star-fishes, 

 sea-urchins, and sea-cucumbers, together with entozoa, 4 or 

 intestinal parasites and their allies, on all of which the 

 common name ANNULOIDA 5 has been imposed. 



A sixth primary group bears the title CCELENTERATA, 6 and 

 contains all sea-anemones, jelly-fishes, Portuguese men-of-war, 



1 Crabs, lobsters, and shrimps are sometimes improperly spoken of as shell- 

 fishes. 2 From UO-KOJ, a wine-skin or pouch. 



3 Molluscoida, from mollusca and etc>o, form, appearance. 



4 'El/Tot;, in, and ^Coov, animal. 5 Annuloida, from anmtlus and etioj. 

 6 Ccelenterata, from xolXa, hollow ; ei-repa, entrails. 



