442 ON THE STRUCTURE AND DEVELOPMENT OF LEPIDOSTEUS. 
Fig. 77. Longitudinal horizontal section through the vertebral column of a larva of 
11 centims., passing through the level of the haemal arches, and showing 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 vertebrae 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. 
