286 THE EOCENE FLORA AND FAUNA. 



Otodus ohliquus is represented by a very characteristic tooth. 



Odontaspis macvota. I have an example of the typical lateral 

 teeth of this species, identical in shape with Fig. 20 in Mr. 

 Woodward's paper above referred to. This is of special interest 

 as he remarks that "it is still uncertain whether this species 

 occurs in the London Clay." 



Odontaspis ctispidata was not common. 



Odontaspis clegans, as restricted by Mr. Woodward, was by 

 far the most abundant of the shark's teeth. I obtained over 

 sixty during a couple of hours' search one afternoon. This haul, 

 however, was never repeated ; I had evidently come across the 

 accumulation of years. 



Besides the teeth of Oxyvhina hastalis-''- (Ag.), and the dermal 

 spines of Raia clavata-'- (L.), which are probably of Pliocene 

 age, the Walton Crag contains a number of other derived 

 Selachian remains which have clearly been washed out of Eocene 

 strata, usually London Clay, as shown by the hardened and 

 phosphatized nodules of that material which often partially 

 encloses them. They are: — 



Galens sp. 



'■'Odontaspis elegans or O. cuspidata 

 ''■'Odontaspis ntacrota 

 *Myliohatis toliapicns 



The tooth of Galens is unfortunately lost. I remember very well 

 comparing it with the specimen from the London Clay in the 

 British Museum (A. S. Woodward's fig. 28, op. cit.) with which 

 it was identical. The specimen of Odontaspis ntacrota is the twin 

 brother of the one recorded above from the London Clay, that is 

 with regard to shape, for it is stained a reddish colour through 

 long contact with its ferruginous matrix. Myliobatis toliapicns is 

 represented by numerous pieces of its peculiar dentition. 



In conclusion I would point out that the following list 

 might be considerably enlarged by further search in this promis- 

 ing locality. 



