. Outlines of zoology. Zoology. 6g8 MAMMALIA. wards, the dental formula is —32. 3*33 there is a caecum. The stomach is complex, and Group 2.—Tylopoda, comprising the family Camelidse—the camels of the Old World and the llamas of S. America. The limbs are long, with only the third and fourth digits developed; the two metacarpals and metatarsals are united for the greater part of their length, but there is a deep distal cleft; the tips of the digits have very incomplete hoofs, and the animals walk on a broad pad of skin surrounding the middle phalanges. The femur is long and vertical, and the kn
. Outlines of zoology. Zoology. 6g8 MAMMALIA. wards, the dental formula is —32. 3*33 there is a caecum. The stomach is complex, and Group 2.—Tylopoda, comprising the family Camelidse—the camels of the Old World and the llamas of S. America. The limbs are long, with only the third and fourth digits developed; the two metacarpals and metatarsals are united for the greater part of their length, but there is a deep distal cleft; the tips of the digits have very incomplete hoofs, and the animals walk on a broad pad of skin surrounding the middle phalanges. The femur is long and vertical, and the knee is low down. Of the three upper incisors only one persists in adult life, as an isolated sharp tooth, those of the lower jaw are long and slope forwards. There are canines both above and below. The molars are selenodont. The animals ruminate, and the stomach is divided. Fig. 305.—Side view of sheep's skull, with roots of back teeth exposed. — From Edinburgh Museum of Science and Art. /, Frontal ; nasal; pm., premaxilla; 111., maxilla; /., jugal; sg., squamosal; /., lachrymal. into a rumen with several parts, a tubular psalterium, and an abomasum. The division between the two last is vague exter- nally. On portions of the rumen there are peculiar glandular honeycomb-like cavities, or "; The Camelidse are unique among Mammals in having oval instead of circular red blood corpuscles. The placenta is diffuse. Examples.—Camelus, ——, the Arabian camel (C. dromedarius) has a dorsal hump of fat, the Bactrian camel (C bactriamts) has two humps. The genus Auchenia, ^2, includes the llama, alpaca, huanaco, and vicugna of S. America, smaller forms than the camels, and without humps. Group 3.—Tragulina or Chevrotains, small animals, "intermediate in their structure between the deer, the camels, and the ; There are four complete toes on each foot, but the second and. Please note that these images are extracted from scanned page images
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