Elementary anatomy and physiology : for colleges, academies, and other schools elementaryanato00hitc Year: 1869 AND PHYSIOLOGY. 103 on the jaws, tongue, and palate. They are repeatedly re- newed during the life of the animal. Fig. 116 represents the microscopic structure of the tooth of an Eagle Ray. Fig. 116. Microscopic structure of Tooth of Eagle Ray. 223. Skeleton, or Harder Parts of Invertebrata— The harder parts of invertebrate animals generally differ so much from bones in composition and^ structure that the term Osteo- logy may perhaps be less proper than that of Skeleton in descr
Elementary anatomy and physiology : for colleges, academies, and other schools elementaryanato00hitc Year: 1869 AND PHYSIOLOGY. 103 on the jaws, tongue, and palate. They are repeatedly re- newed during the life of the animal. Fig. 116 represents the microscopic structure of the tooth of an Eagle Ray. Fig. 116. Microscopic structure of Tooth of Eagle Ray. 223. Skeleton, or Harder Parts of Invertebrata— The harder parts of invertebrate animals generally differ so much from bones in composition and^ structure that the term Osteo- logy may perhaps be less proper than that of Skeleton in describing them. 224. Skeletons of Crustaceans—Among the Articu- lata the Crustaceans have a more or less solid external crust of carbonate of lime in a base of peculiar azotic matter, in- soluble in caustic potash, called Chitine. 225. Skeletons of Insects.—Insects, the most numerous class of articulated animals, have a chitinous covering, gener- ally leathery, but sometimes solid. The Arachnoidea have a similar skin, soft or coriaceous, rarely horny; and the Anne- lida a very thin epidermis. The Helminthes, Rotatoria, and Turbellaria, reckoned in this branch of the animal kingdom What is curious about their renewal? 224. Describe the skeleton of Crustaceans! 225. What is the skeleton of Insects f 5*
Size: 1544px × 1295px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
