. Outlines of zoology. our toes on the fore-feet, and three incisors are rooted, the upper canines are directed down-wards, the dental formula is ^^. The stomach is complex, and 3133 ^ there is a 2.—Tylopoda, comprising the family CamelidsE—the camelsof the Old World and the llamas of S. America. The limbs 756 MAMMALIA. are long, with only the third and fourth digits developed ; thetwo metacarpals and metatarsals are united for the greater partof their length, but there is a deep distal deft; the tips of thedigits have very incomplete hoofs, and the animals walk on abro
. Outlines of zoology. our toes on the fore-feet, and three incisors are rooted, the upper canines are directed down-wards, the dental formula is ^^. The stomach is complex, and 3133 ^ there is a 2.—Tylopoda, comprising the family CamelidsE—the camelsof the Old World and the llamas of S. America. The limbs 756 MAMMALIA. are long, with only the third and fourth digits developed ; thetwo metacarpals and metatarsals are united for the greater partof their length, but there is a deep distal deft; the tips of thedigits have very incomplete hoofs, and the animals walk on abroad pad of skin surrounding the middle phalanges. Thefemur is long and vertical, and the knee is low down. Of thethree upper incisors only one persists in adult life, as an isolatedsharp tooth, those of the lower jaw are long and slope are canines both above and below. The molars areselenodont. , The stomach shows a complex rumen with glandular water-cells, a tubular psalteriuiri, and an abomasum. The. Fig. 406.—Side view of sheeps •A/^., Premaxilla; AfX, maxilla; iV>3., nasal;/., Jugal; i., lachrymal;FR., frontal; PA., parietal; SQ., squamosal; CO., condyle; PP.,paroccipital process. CamelidEe are unique among Mammals in having oval instead ofcircular red blood corpuscles. The placenta is —Camelus, —^, the Arabian camel (C dromedarius) has a dorsal hump of fat, the Bactrian camel (C. bactrianus)has two humps. The camel has a very small area of visibleperspiration on the back of the neck, and seems to have asomewhat variable body-temperature, two associated facts whichmay be adapted to conserving the animals water-supply in arid countries. The genus Auchenia, —, 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, interiTiediate in their structure between the deer, the camels, and the pigs. There are four comple
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
