Enaliosauria. 



PIATE 3. 



Ichthyosaurus campylodon, nat. size. 



Fis 



1 . Section of the skull anterior to the maxillary bones. 



15. Nasal bones. 



22. Premaxillaries : g, external groove ; al, origin of the internal alveolar 

 plate ; al 1 , where it appears to have been broken ; al", thickened 

 terminal border of the plate ; a, external alveolar wall. 



31. Splenial part of lower jaw. 



32. Dentary part of ditto : <,', external groove ; al*, internal alveolar wall. 



2. Section of the skull near the termination of the nasal bones 15, 15. o, vascular 



canal : the other letters and figures as in the foregoing figure. 

 From the lower Chalk of Cambridgeshire. In the Collection of James Carter, 

 Esq., M.R.C.S. 



