396 DR TRAQUAIR ON THE STRUCTURE OF TRISTICHOPTERUS ALATUS. 




Figure 6. A group of facial and shoulder-bones lying detached on a slab of stone. 
Figure 7. Horizontal section of a detached dentigerous bone (mandible ?), showing the structure and 
arrangement of the teeth. Magnified a little more than 3 diameters. A.A. Transverse 
sections of the bases of two of the larger teeth. 
Figure 8. One of the large teeth of Tristichopterus, magnified 7 diameters. 
Figure 9. Clavicle and part of the pectoral fin, the latter displaced downwards, but showing part of 
the internal skeleton of the lobe. 
Figure 10. Anterior part of a specimen of Tristichopterus, principally to show the form of the pectoral 
fin and of its basal lobe. The rays of the inner side of that fin are injured and broken 
up, except at their origins. s.cl, Left supraclavicular; cl’, portion of left clavicle; cl, 
right clavicle, seen from the inner side ; 7.cl, right interclavicular. 
Figure 11. Restored figure of Tristichopterus alatus. 
