PLATE XL. 



PAGE. 



Fig. 1. Ventral Plate of Titanichthys? 611 



Outer face showing wide marginal overlaps of adjoining plates and narrow plate 

 fitting on in front. 



Fig. 2. Monocladodus Ctarki 619 



Showing position of teeth in the jaw with a magnified view of a single tooth and 

 of the two teeth in position. 



