243 
Fig. 2, Ventral surface of the same undried skull. 
Natural size. The dotted line indicates the 
swerve of the ventral axis of the cranium 
towards the left side caused by the rotation 
towards the right of the orbital region of the 
cranium. ‘he chondrocranium appears on 
the surface of the cranium in several places, 
and not always symmetrically. 
Fig. 3. Lateral view of the same skull seen from the 
right or ocular side. Natural size. The 
right nasal and right lachrymal are here 
fully shown, and do not appear in perspective 
as in figs. 1 and 2. 
Prats II. 
Fig. 4. The occipital region of the same skull viewed 
from behind. Natural size. The dotted line 
indicates the departure from the symmetry. 
The chondrocranium appears on the surface 
between the exoccipitals and epiotics. 
Fig. 5. Lateral (moist) dissection of the opercular 
bones, palato-pterygoid arcade, and jaw 
apparatus of the Plaice, on the ocular or 
right side. Natural size. Hxtreme length 
of specimen J4cm. ‘The palatine has been 
rotated downwards in order to illustrate its 
shape, and the lower jaw has been depressed. 
In the natural disposition of the parts the 
lower end of the maxilla lies external to the 
mandible. 
Fig. 6. Dorsal (moist) dissection of the Hyoid arch of a 
34cm. Plaice. Natural size. In the living 
animal the stout hyoid bar is almost vertical 
and the basi-hyal projects forwards at right- 
