British Upper-Jurassic Fish-remains. 401 



were discovered by l\[r. S. Kin;^ in the Lower Calcareous 

 Grit of Browse Pit, Malton, in 1850 ; the fine pair of splenials 

 and tlie detached teeth were obtained from the same forma- 

 tion by Mr. Chadwick himself more recently. 



The vomerine dentition (fig. 2) is a comparatively small 

 specimen and evidently much abraded. It shows none of the 

 punctation noted by Agassiz in the type, and there are only 

 feeble indications of the apical indent on the teeth. The 

 median teeth are very prominent, scarcely broader than long, 

 nearly quadrate with rounded angles, and equalling in breadth 

 the two lateral series. The inner lateral series is the smallest, 

 low and forming a deep groove between the others, and the 

 shape of the teeth is very irregular, there being a tendency 

 to antero-posterior elongation. The outer teeth are about as 

 broad as long and rise to a blunt apex. 



The normal splenial dentition (fig. 3) exhibits an arrange- 

 ment of teeth almost identical with that of G. Cuvieri, though 

 apparently differing in the less prominence of the principal 

 series and in the greater smoothness of all the teeth. The 

 specimen, however, is abraded, and much of the feebleness of 

 the ornament may be accidental. The teeth of the principal 

 series are the most nearly smooth, only four of those in front 

 exhibiting traces of the apical ring ; the teeth of the inner and 

 third series are about equal in size, nearly always as broad as 

 long ; those of the outer series are larger and much broader 

 than long. 



A large example of the right splenial dentition (fig. 4), 

 with teeth wide apart, apparently owes its abnormal characters 

 to crushing, the bone having disappeared. The teeth show 

 much evidence of wear during the life of the animal ; and 

 those of the iimermost series are relatively fewer and larger 

 than in the original of fig. 3. Most of the inner teeth are 

 also obliquely elongated. 



If a detached tooth from Setterington pertains to the 

 principal splenial series of G. punctatus, as seems probable, 

 the species must have attained a still greater size than is 

 indicated by the last specimen. 



Form, and Loc. Corallian (Lower Calcareous Grit) ; Mal- 

 ton, Yorkshire. 



3. Notidanus Muensteri, Agassiz. 

 (PI. XVIIL fig. 5.) 



1843. Kotidanus Muensteri, L. Agassiz, Poiss. Foss. vol. iii. p. 222, 

 pi. xxvii. figs. 2, 3. 



Only throe teeth of the primitive shark Notidanus have 



