THE FISHES 
OF 
LEICESTERSHIRE AND RUTLAND. 
Class PISCES. 
Sub-class DIPNOI. 
Family SIEENID^F. 
Geratodus latissimus, Agassiz. 
The Museum possesses two fossils which were collected by Mr. Harrison 
from the Rhaetic Beds, Spinney Hills, and regarded as teeth of this species, but 
are now considered as very doubtful by Mr. A. Smith Woodward, F.G.S., F.Z.S., 
British Museum, to whom I am greatly indebted for assistance in referring the 
fossil fishes. Two specimens, however, — one of them very fine — obtained by 
Mr. Quilter from the same place and now acquired by the Museum, are thus 
described by Mr. "W^oodward in his notes ‘ On some Remains of Fossil Fishes 
from the Rhsetic Beds of the Spinney Hills, Leicestershire ’ (see ‘ Trans. Leicester 
Lit. and Phil. Soc.’, April, 1889, p. 21) :■ — “ A fine tooth of Geratodus, and a 
fragment, are indistinguishable from some of the common forms from Aust 
Cliff, referable to G. latissimus. The nearly complete tooth measures between 
six and seven centims. in its longer diameter, and is completely detached both 
from its supporting bone and from the matrix. The coronal surface is irregular 
and comparatively flat ; there are distinct indications only of three outer 
“ horns,” or denticles, though there may have been a fourth small one ; 
and the relative breadth of the tooth suggests that it pertains to the upper 
jaw.” This is interesting, as two species of the same genus have existed in 
Australia up to the present time, and according to Gunther these survivors 
of the Triassic and Jurassir formations were not discovered until about the 
year 1870. 
