. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. Mtmmalia. 28i backbone. A comparatively recent grouping is into Pro- tozoa or one-celled animals, and Metazoa, or many-cclled animals. Each of these groupings simply characterizes one group (one system taking the lover end and *.he other the higher end of the animal series) and lumps off all the rest in one negatively named group. Neither of these sys- tern, pretends to do anything more than call attention to the presence or absence of a single feature of structure ruh ToMi Sii«k« Sparrow MouM Olbctory lob*. Fio. 167. Diagra
. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. Mtmmalia. 28i backbone. A comparatively recent grouping is into Pro- tozoa or one-celled animals, and Metazoa, or many-cclled animals. Each of these groupings simply characterizes one group (one system taking the lover end and *.he other the higher end of the animal series) and lumps off all the rest in one negatively named group. Neither of these sys- tern, pretends to do anything more than call attention to the presence or absence of a single feature of structure ruh ToMi Sii«k« Sparrow MouM Olbctory lob*. Fio. 167. Diagram of Brains of Virtebratks. From KcUogg's Zoology. TheBtsis of Classification of basis of cl .ssi- fication of animals is structure, only so many branches \ ine recognized as there are distinct plans of structure. It is generally understood that the structure considered is that of the adult, since many animals change greatly during their development. But in some cases, especially of degenerate forms, tne larval form shows, more clearly than the adult the true relationship. Consequently embryology must be called m as an aid in classification. Fossils also clear up many doubtful points in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Colton, Buel P. (Buel Preston), 1852-1906. Toronto : Copp, Clark
Size: 2330px × 1072px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1903
