DEVELOPMENT OF THE SCALES AND BONES OF FISHES. 
701 
Fig. 13. Vertical section of a scale of a species of Batistes (File-fish), made parallel 
to the lateral line. Magnified 18 diameters. 
PLATE XXIX. 
Fig. 14. Vertical section of a scale of the Flying Gurnard {Dactylopterus), parallel 
to the lateral line. Magnified 20 diameters. 
Fig. 15. Vertical section of the scale of Loricaria cataphracta, Linn. (L. setigera, 
Lacepede). Magnified 14 diameters. 
Fig. 16. One of the dermal teeth from the surface of the same scale. Magnified 65 
diameters. 
Fig. 17. Dermal plate from a species of Ostracion, superior surface. Magnified 3 
diameters. 
Fig. 18. Inferior surface of the same. 
Fig. 19. Vertical section of the same along the dotted line, 18 a a'. Magnified 12 
diameters. 
Fig. 20. Portion of a similar section. Magnified 36 diameters. 
Fig. 21. Horizontal section of one angle of the above scale, in the plane of the 
canals, fig. 19 A and 20 b. Magnified 12 diameters. 
Fig. 22. Vertical section of the margin of a scale of another species of Ostracion. 
Magnified 60 diameters. 
Fig. 23. Central portion of a vertico-transverse section of the last scale, subsequent 
to its decalcification, and made in the direction of the lines a' h in fig. 18. 
Magnified 40 diameters. 
PLATE XXX. 
Fig. 24. Vertical section of a portion of the same decalcified scale. Magnified 55 
diameters. This section is made nearly at right angles to the last, and 
near one of its extremities. 
Fig. 25. Bundle of fibres from the same decalcified scale. Magnified 250 diameters. 
Fig. 26. Horizontal section of part of the same decalcified scale, a little inferior to 
the plane of fig. 21, and showing the fibrous bundles (fig. 25), and the 
reticular ones of fig. 24 d in their natural positions. Magnified 300 dia- 
meters. 
Fig. 27. One of the calcareous septa, figs. 19 and 20 e, after the animal matter has 
been removed by exposure to a boiling solution of caustic potass. Mag- 
nified 150 diameters. 
Fig. 28. Vertical section of the vertebra of a Ray {Raia clavata), made at right angles 
to the spinal axis, midway between the two concave articular cones. 
Magnified 6 diameters. 
4 x 
MDCCCLI. 
