. Outlines of zoology. Zoology. PROTOTHERIA. 681 5. Rodentia. Simplicidenlata. Duplicidentata. 6. Carnivora. Carnivora Vera. Pinnipedia. Creodonta (extinct). 7. Insectivora. Insectivora Vera. Dermoptera. 8. Chiroptera. Megachiioptera. Microchiroptera -*h~Lemuroidea. | „ . 10T Anthropoidea. [= Plates. I Sub-class Prototheria (Syn. Ornithodelphia), Orders Monotremata and Allotheria. The Monotremes include the duckmole (Ornithorhynchus anatinus), the spiny ant-eater {Echidna acukata), and a third form resembling Echidna, but often referred to a distinct genus as Proechidna. These are the lowest M
. Outlines of zoology. Zoology. PROTOTHERIA. 681 5. Rodentia. Simplicidenlata. Duplicidentata. 6. Carnivora. Carnivora Vera. Pinnipedia. Creodonta (extinct). 7. Insectivora. Insectivora Vera. Dermoptera. 8. Chiroptera. Megachiioptera. Microchiroptera -*h~Lemuroidea. | „ . 10T Anthropoidea. [= Plates. I Sub-class Prototheria (Syn. Ornithodelphia), Orders Monotremata and Allotheria. The Monotremes include the duckmole (Ornithorhynchus anatinus), the spiny ant-eater {Echidna acukata), and a third form resembling Echidna, but often referred to a distinct genus as Proechidna. These are the lowest Mammals, very differ- ent from all the rest, and they exhibit affinities with Sauropsida, and perhaps even with Am- phibia. It need hardly be said that they have no special affinities with Birds. The duckmole is found in the rivers of Australia and Tasmania; Echidna, in Australia, Tasmania, and New Guinea; Proechidna in New Guinea. In Ornithorhynchus the skin is covered with soft fur; in Echidna and Proechidna there are spines among the hairs. The mammary glands in the female Ornithorhynchus open on a flat patch; in Echidna, in a depressed area around which a temporary pouch seems to be developed. There are no distinct Fig. 297.—Pectoral girdle of Echidna.—From Edinburgh Museum of Science and Art. sc, Scapula; clavicle; interclavicle ; co., metacoracoid ; , epicoracoid ; st., 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 Thomson, J. Arthur (John Arthur), 1861-1933. Edinburgh, Glasgow and London, H. Frowde and Hodder & Stoughton
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Keywords: ., bookauthorth, bookcentury1800, bookdecade1890, booksubjectzoology
