637 
cartilage. If this be so, the pre-trigeminus portion of the lateral wall 
of the chamber is wholly wanting in these fishes, as it is also in 
young embryos of Ceratodus and in the adults of most teleosts, the 
post-trigeminus portion of the wall being represented in the posterior 
portion of the palatoquadrate. The hind end of the palatoquadrate 
would then represent the processus oticus. 
Palais de Carnolés, Menton, May 26th 1914. 
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