Image from page 341 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598437700)

Identifier: introductiontozo00dave

Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools;

Year: 1900 (1900s)

Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866-

Subjects: Zoology

Publisher: New York, Macmillan company London, Macmillian and co., ltd.

Contributing Library: MBLWHOI Library

Digitizing Sponsor: MBLWHOI Library

Text Appearing Before Image:

FIG. 296. — Ortiithorhynctius atiattnus, the duckbill. After Vogt and Specht. avarice of fur hunters - - this is the American beaver, ananimal which has developed extraordinary instincts for theconstruction of dams and subaquatic passages. Other Mammals.- The Monotremata1 are the lowestmammals, and in many ways seem to connect the classwith reptiles or amphibians. The milk glands are in a s, single, Tprjua, hole or opening ; so called because urinary, geni-tal, and alimentary canals have a common external opening. 822 ZOOLOGY low state of development and eggs are laid, as in reptilesand birds. There are two principal types, - - the Duck-bill (fig. 296), with aquatic habits, and the SpinyAnt-eaters (Echidna, Fig. 297), inhabiting rocky places.Both types are confined to Australia and neighboringislands. The Marsupialia ! have a remarkable distribution overthe earth to-day. All are confined to Australia and adja-

Text Appearing After Image:

FIG. 297. — Echidna aculeata, the spiny ant-eater. After Vogt and Specht. cent islands, excepting the family of opossums (Fig. 298),found only in the Americas. There is thus a great dis-continuity in the distribution of marsupials. This isaccounted for by the evidence that formerly the wholeworld contained marsupials, so that those living to-day arethe separated remnants of that once universal race. Theopossums are most numerous in the tropics, but the Vir-ginian opossum ranges north to New York. 1 marsupitan, a pouch. THE MOUSE AND ITS ALLIES 323 The Edentata,1 few of which are entirely without teeth,include the sloths, hairy ant-eaters, armadillos, scaly ant-eaters, and aardvarks, or African ant-eaters. The threefirst-named families inhabit South America; the twolatter, Asia and Africa. Here, again, the discontinuity ofthe group indicates what fossils prove, that the Edentates

introduction to zoology a guide to the study of animals for the use of secondary schools tachyglossus aculeatus illustrations book illustrations ornithology birds zoological illustration zoology animals mammals amphibians images from internet archive

1944

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