154 CLASS-BOOK OF ZOOLOGY. 



Authorities for the Natural History of Insects. 



J. C. Fabricii, Systema Entomologiae 1775 



Reaumur, Histoire des Insectes 1742 



P. A. Latreille, Histoire des Insectes 1804 



W. Kirby and W. Spence's Introduction to Entomology 1818 



T. F. Blumenbach's Handbuch der Naturgeschichte 1825 



Say's American Entomology 1825 



Dejean, Species general des Coleopteres 1825-1831 



M. John Le Conte, Histoire generate et Iconographie des Lepidop- 



teres et des Chenille de l'Amerique Septentrionale — 1833 



Oken's Allgemeine Naturgeschichte liir alle Stiinde ' • • • • 1836 



SECTION XL. 



VI. HELMINTHOLGY. 



§ 665. Helminthology treats of those animals which 

 have white blood, and no articulated organs of motion ; 

 as the Sea-blubber, Shellfish, Intestinal Worms, etc. 



\ 666. The abode of those animals which, collectively, 

 are called Worms, is generally in water, and by far the 

 greater part of them in the ocean. Some live under- 

 ground, and others, as the Intestinal Worms, for instance, 

 exclusively in the living bodies of other animals. 



§ 667. Great numbers of them are eatable, as the 

 Shellfish ; others afford materials for 'building houses and 

 paving streets, as Corals ; and some are burnt for lime, 

 as the Marine Shells. 



\ 668. Among the noxious animals of this class may 

 be mentioned the worms which live in the intestines of 

 the human body, as the Tape-worm, and those found in 



