GLOSSARY, 



CONTAINING 



THE NAMES OF THE SUB-KINGDOMS, 

 CLASSES, AND ORDERS, 



AND THE 



SCIENTIFIC TERMS OCCURRING IN THIS WORK.* 



ACALE'PH^E, an order of rayed animals, well known by the name 



of Sea-nettles. They are remarkable for their gelatinous 



structure and their stinging powers. From the Greek 



a/calephe, a nettle. 

 ACANTIIOPTERY'GII, an order of fishes, in which the dorsal fins 



are supported in part by spinous rays. Gr. acanthos, a spine, 



pteryx a whig or fin. 

 ACE'PHALA, a group of molluscous animals which, like the 



Oyster and Scallop, are destitute of a head. Gr, a, without; 

 ..kephale, the head. 

 AERATED, a term applied to water or other liquids when im- 



..pregnated with air. 

 AERIAL RESPIRATION, breathing which belongs to the air, and 



is carried on by lungs, as distinguished from that which has 



reference to water, and is effected by gills. 

 AFFINITIES, a term used to denote the close relationship in 



points of structure existing between different animals or 



groups of animals. Lat. affinis, allied to. 

 AGGLU'TINATED, having the one part united to another as if glued 



together. Lat. ad, to, gluten, glue. French, agglutiner. 

 AG 'GRE GATED, collected together. Lat. aggregare, to gather to- 

 gether. 

 ALBU'MEN, a thick glairy substance like the white of an egg. 



Lat. albus, white. 



* Some words, which strictly speaking are not scientific terms, have, by the 

 advice of some experienced teachers, been introduced hi the Glossary. And for 

 the same reason the Greek words, whence the terms are in many cases derived, 

 are given, not in the Greek characters, but in the ordinary Italic letters, the 

 Greek upsilon being throughout represented by the letter y. 



