. Elementary text-book of zoology. MAMMALIA. 493 to ten in all. They appear to have two main cusps and smaller " crenulations," the cusps lying externally in the lower jaw and internally in the upper. The beaks are borne upon bony processes of the premaxilla and the skull of the duckmole is at once recognised by the peculiar " beak- shape " of the facial region together with the hard cornules. The male Ornithorhynchus has a " spur" on the inside of the hind-foot which is traversed by a canal continuous with the duct of a gland situated over the thigh. It is probab
. Elementary text-book of zoology. MAMMALIA. 493 to ten in all. They appear to have two main cusps and smaller " crenulations," the cusps lying externally in the lower jaw and internally in the upper. The beaks are borne upon bony processes of the premaxilla and the skull of the duckmole is at once recognised by the peculiar " beak- shape " of the facial region together with the hard cornules. The male Ornithorhynchus has a " spur" on the inside of the hind-foot which is traversed by a canal continuous with the duct of a gland situated over the thigh. It is probably Fig. 338.—Bones of Limbs of {Ad nat.) Distal end Tibia. of Fibula. Radius. Ulna. Hind-limb above. Fore-limb below. Humerus. a poison-apparatus and is supposed to be functional early in the breeding season. It is rudimentary in the young female. The skeleton of the limbs shows powerful ridges and crests on humerus and femur, and the fibula has a projecting process beyond the knee-joint which gives it a deceptive resemblance to an ulna. Echidna and the allied genus Proechidna, the "Porcu- pine anteaters," are, like Ornithorhynchus, confined to the Australian region, Proechidna to New Guinea. Echidna may be about 16 to 18 inches long, with a fat compact. 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 Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1902
