244 
angles from its upper border. The lower 
border of the bar in the figure is therefore 
the dorsal border, and the face shown is the 
anterior face. The first pair of branchiostegal 
rays has been turned forwards. They really 
pass straight backwards in the mid-ventral 
line. The branchiostegal rays are numbered 
from before backwards, and have been dis- 
played. 
Fig. 7. Dorsal (moist) dissection of the branchial arches 
of a 34cm. Plaice. Natural size. The arches 
have been flattened out and displayed. On 
the right side the three pharyngo-branchials 
forming the superior pharyngeal bone have 
been separated and left attached to their 
respective arches, but on the left that bone 
is represented intact drawn from its oral 
surface. The arches are numbered from 
before backwards (i.-v.). 
Fig. 8. Lateral (moist) dissection of the right pectoral 
girdle and fin of a 34cm. Plaice. Natural 
size. The “ inter-clavicle ’ in front is shown 
in its correct position relative to that of the 
pectoral girdle. The fin rays have been 
separated from the two fibro-cartilaginous 
pads with which they articulate. 
Fig. 9. Lateral (moist) dissection of the right pelvic 
girdle and fin of a 34cm. Plaice. Natural 
size. The fin rays are represented dis- 
articulated from the fibro-cartilaginous pad. 
Puate III. 
Fig. 10. First or atlas vertebra viewed from the front of 
a O2cm. Plaice. Natural size. The acces- 
