164 DIffOSATTBlA. 



anterior border. Generally of smaller size than M. bucklandi. If 

 the undermentioned sacrum belongs to this species it may be entitled 

 to generic distinction. The species was founded on the supposition 

 that the anterior border of the teeth was devoid of serrations ; but 

 a large series of specimens shows that this is due to wear, every 

 intermediate gradation between a completely serrated and a smooth 

 border being observable. 



Hab. Europe (Germany and England). 



Unless it is stated to the contrary all the following specimens are from 

 the Wealden. 



44806. The crown of a large tooth probably belonging to this form ; 

 from the Purbeck, locality unknown. 



Presented by B. Bright, Esq., 1873. 



2828. Fragment of Tilgate Grit containing the crown of a tooth ; 



(Fig.) from Cuckfield, Sussex. Figured by Owen in his ' Wealden 

 and Purbeck Eeptilia ' (Mon. Pal. Soc), pt. iii. pi. xi. fig. 4, 

 as M. bucklandi. On the anterior border the serrations 

 are worn off. Mantell Collection. Purchased, 1838. 



2332. The crown of a tooth in a fragment of sandstone; from 



(Fig.) Cuckfield. Figured by Owen, op. cit. pi. xi. fig. 3, as 



M. bucklandi. The serrations have nearly disappeared 



from the anterior border, although faint traces here and 



there remain. Same history. 



3222. The imperfect crown of a tooth ; from Cuckfield. Figured by 

 (Fig.) Owen, op. cit. pi. xi. fig. 5, as M. bucklandi. A faint trace 

 of serrations remains on one part of the anterior border. 



Same history. 



3223-4. The crowns of four small teeth ; from Cuckfield. Figured 

 (Fig.) by Owen, op. cit. pi. xi. figs. 7-10, as M. bucklandi. 



Same history. 



3225. The crown of a much abraded tooth; from Cuckfield. Fi- 

 (Fig.) gured by Owen, op. cit. pi. xi. fig. 11, as M. bucklandi. 



Same history. 



3221. The crown of a tooth ; from Sussex. Figured by Mantell in 

 (Fig.) his ' Geology of the South-east of England,' p. 261, fig. 1. 

 The serrations have totally disappeared from the anterior 

 border, although they are introduced in the figure. 



Same history. 



