Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 FIG. 29.'—TAIL OF Protopterus. thoracic, and a very short caudal. In Anura, no special lumbar region can be recognised, and the caudal portion is modified to form a ' urostyle ' (see p. 42). The notochord of Urodele Iarva3, like that of most Fishes, undergoes vertebral constrictions, while intervertebrally it grows thicker, and accordingly appears expanded. Thus the vertebrae here FIG. 30. —TAIL or Lcpidostcus. also are am phic colons. Later, intervertebral masses of car
Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 FIG. 29.'—TAIL OF Protopterus. thoracic, and a very short caudal. In Anura, no special lumbar region can be recognised, and the caudal portion is modified to form a ' urostyle ' (see p. 42). The notochord of Urodele Iarva3, like that of most Fishes, undergoes vertebral constrictions, while intervertebrally it grows thicker, and accordingly appears expanded. Thus the vertebrae here FIG. 30. —TAIL or Lcpidostcus. also are am phic colons. Later, intervertebral masses of cartilage become developed, which, together with the bone which is formed at the same time in the surrounding connective-tissue, extend in- wards towards the centre, gradually constricting the notochord so that eventually it may become entirely obliterated. Finally a dif- ferentiation, as well as a resorption, extending inwards from the
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