ON THE ANATOMY OF FISHES. 
329 
Figs. 78-81. — Clarias Nieuhojii. 
Fig. 78. The base of the skull, the anterior vertebrae, and the two osseous 
capsules ; X 2. 
Fig. 79. Vertical longitudinal section of the hinder part of the skull and 
the anterior vertebrae ; X 2. 
PLATE XVIII. 
Fig. 80. Ventral view of the two air-sacs in situ. 
Fig. 81. Ventral view of the interior of the right air-sac, showing the fibres 
of the dorsal wall and their relations to the tripodes ; X 2. 
Figs. 82, 83. — Plotosus canius. 
Fig. 82. Ventral view of the anterior vertebrae and the tripodes ; X 1^. 
Fig. 83. Interior of the air-bladder ; ventral view ; X 2. 
Fig. 83a. — Saccohranclius fossilis. Ventral view of trlpus ; X iV 
Fig. 84. — Silurus glanis. Interior of the air-bladder ; ventral view ; X 1^. 
Fig. 85. — Eutropiichthys vacha. The base of the skull, the bony capsules, and the 
anterior vertebrae ; X 2. 
Fig. 86. — Cryptopterus hexapterus. Ventral view of the anterior vertebrae and their 
processes ; X 2. 
PLATE XIX. 
Figs. 87, 88. — Ailia hengalensis. 
Fig. 87. The base of the skull and the osseous recesses for the tubiform air- 
bladder ; ventral view ; X 3. 
Fig. 88. Lateral view ; X 3. 
Fig. 89. — SchilhicJithys garua. Ventral view of the base of the skull, the right 
osseous capsule, and the interior of the left half of the air-bladder ; 
X 2. 
Figs. 90, 93, 'di. - Pangasius djamhal. 
Fig. 90. Ventral view of the left halves of the anterior vertebrae, and the 
left “ elastic-spring.” 
Fig. 93. Interior of the air-bladder; ventral view. 
Fig. 94. The right tripus ; ventral view. 
Figs. 91, 92. — Pangasius Buchanani. 
Fig. 91. Interior of the air-bladder ; ventral view. 
Fig. 92, Ventral view of the anterior chamber ; X 3. 
Fig. 95. Pangasius juaro. — Ventral view of the anterior vertebrae, and the ‘‘ elastic- 
spring ” apparatus ; X 4. 
Fig. 96. Pangasius micronema. — Ventral view of the anterior vertebrae and their 
MDCCCXCIII. — B. 2 U 
