EejjtiUan Tooth vitli two Fools. 



229 



which genu3 I should be disposed to refer the teeth from 

 Cuckiield, for which Mr. Lydekker has suggested the name 

 Megahsaunis Oweni. It is interesting that the dwarf carni- 

 vorous Saurischian Nuthetes shoukl be associated with a 

 dwarf Ornithischian, Echinodon, allied by its teeth to Scelido- 

 satirus, and to that genus I should refer the dermal bone.*, 

 termed granicones, which were associated by Sir R. O.ven 

 with Nuthetes. 



There being obvious points of resemblance between the 

 Saurischia and the Anomodontia, in the possession of similar 

 skeletal elemeiits which approximate to those of mammals, it 

 has seemed worth recording that in the British ^tuseuni, 

 among the twelve isolated t&G,i\i oi N uthetes 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 (Jwen's original figure, and widens from the apex to 

 the base of the roots, where it is 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 Nu- 

 thetes. Below the crown the 

 tooth divides into two slightly 

 divergent roots, which are o 



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 



narrow slightly towards their 



extremities; the posterior root 



loutli of Xntlietes. Brit. Miis. 

 No. 48208. X 10. 



