Reptilian Tooth with two Roots. 229 
which genus I should be disposed to refer the teeth from 
Cuckfield, for which Mr. Lydekker has suggested the name 
Megalosaurus Owent. It is interesting that the dwarf carni- 
vorous Saurischian Nuthetes should be associated with a 
dwarf Ornithischian, Echinodon, allied by its teeth to Scelédo- 
saurus, and to that genus I should refer the dermal bones, 
termed granicones, which were associated by Sir R. Owen 
with Nuthetes. 
There being obvious points of resemblance between the 
Saurischia and the Anomodontia, in the possession of similar 
skeletal elements which approximate to those of mammals, it 
has seemed worth recording that in the British Museum, 
among the twelve isolated teeth of Nuthetes and two fragments 
of jaw obtained with the Beckles collection, is a single tooth 
- which distinctly shows two roots in anterior and_ posterior 
positions. ‘This tooth is 7 millim. long, has lost its enamel, 
and therefore shows no trace of the characteristic marginal 
serrations. It exactly corresponds in form to the anterior 
teeth in Owen’s original figure, and widens from the apex to 
the base of the roots, where it 1s 4 millim. wide. The height 
of the crown is 4 millim., its side is flattened; there is a 
medial area slightly depressed, 
with slightly elevated lateral 
ridges back and front, which 
exactly correspond with those 
upon the typical teeth of Vu- 
thetes. Below the crown the 
tooth divides into two slightly 
divergent roots, which are 3 
millim. long; and the posterior 
root may be slightly the larger. 
Each root is channelled on the 
side by a shallow depression 
similar to that which usually 
extends down the sides of the 
single-rooted teeth of Nuthetes 
and Megalosaurus. The roots 
are well-defined and marked with 
slight wavy concentric lines of 
growth, similar to those which 
frequently occur upon the roots 
of teeth placed in sockets, and 
not unlike the transverse enamel- 
waves on the crowns. The roots Tooth of Nuthetes. Brit. Mus. 
narrow slightly towards their No. 48208, x 10. 
extremities; tle posterior root 
