British Upper-Jurassic Fish-remains. 401 
were discovered by Mr. 8. King in the Lower Calcareous 
Grit of Browse Pit, Malton, in 1850; the fine pair of splenials 
and the 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. Cuviert, 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 innermost 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 Muensterti, Acassiz. 
5] D 
; (Pl. XVIII. fig. 5.) 
1843. Notidanus Muenstert, lL. Agassiz, Poiss. Foss. vol. iii. p. 222, 
pl. xxvii. figs. 2, 3. 
Only three teeth of the primitive shark Not/danus have 
