Fig. 75. Through the anterior part of the tail.
Fig. 76. Rather further back than fig. 75.
Fig. 77. Longitudinal horizontal section through the vertebral column of a larva of 11 centims., passing through the level of the hæmal arches, and shewing the intervertebral constriction of the notochord, the ossification of the cartilage, &c.
Fig. 78. Transverse section through a vertebral region of the vertebral column of a larva 11 centims. in length.
Fig. 79. Transverse section through an intervertebral region of the same larva as fig. 78.
Fig. 80. Side view of two trunk vertebræ of an adult Lepidosteus.
Fig. 81. Front view of a trunk vertebra of adult.
In figures 80 and 81 the red does not represent bone as in the other figures, but simply the ligamentum longitudinale superius.