ICHTHY0SATJK1DJ«:. / \) 



and its extremity is consequently considerably below the 

 level of that of the quadrate, while there is no overlapping 

 of the quadratojugal upon the supratemporal, or of the 

 latter upon the posterior part of the former. These dif- 

 ferences, however, can scarcely be regarded as of specific 

 value ; and the small skull No. 32682 seems to present a 

 nearer resemblance in these points to the preceding spe- 

 cimen. In Owen's figure the articular bones of the man- 

 dible are represented as attached to the quadrates. The 

 determination of the bones of the palate in that figure 



fchthyomwrus zetlandieus. — Frontal aspect of the imperfect cranium; from the 

 Upper Lias of Normandy. ^. nor, nares ; na, nasals; prf, prefrontal; 

 fr, frontal ; />(/', postfrontal ; ///". postorbilal ; gf, supratemporal fossa. 



requires revision ; thus, those marked 20, and regarded as 

 the palatines, arc the vomers ; while No. 25, which are 

 reckoned as the ectopterygoids or transverse bones, are 

 the palatines. The base of the skull is extremely like 

 that of tSj>hcno(hjit, showing the same subpyriforin aperture 



