254 A. Smith Woodward — On the Genus Notidanus. 



a few coarse serrations at its base. To a position somewhat further 

 back in the upper jaw may also be referred the tooth represented in 

 Fig. 21 ; this was obtained from the Eed Crag of Woodbridge, and 

 is preserved in the Eeed Collection of the York Museum. 



N. primigenius is perhaps the most widely distributed of all the 

 extinct species of the genus, and is especially noteworthy on account 

 of its considerable size. It is much larger than N. serratissimus, and 

 its lower teeth also differ from that species in having more secondary 

 cones, and in possessing finer anterior serrations, which are not 

 regular, but decrease from above downwards. With the exception 

 of a brief notice by myself, 1 there appears to have been no record 

 hitherto of the occurrence of the species in Britain, but, as already 

 stated, the originals of three of the figures illustrating this descrip- 

 tion have been obtained from English deposits, and are derived 

 from the Middle Eocenes of Barton and Bracklesham, and the Eed 

 Crag of Suffolk. It is not known to occur in the London Clay. 



On the Continent there are numerous allusions to teeth of this 

 specific type, from the Oligocene and Miocene, and the British 

 Museum also contains specimens from the Eocene of Klein Spau- 

 wen, in Belgium. A single tooth has likewise been described by 

 Gibbes from the Eocene of Eichmond, in Virginia, and shows that 

 this species extended into the New World in early Tertiary times : 

 it would be unsafe at present, however, to regard all the notices of 

 iV. primigenius as correct determinations, although the analogy of 

 other fossil sharks is far from rendering improbable so wide a range 

 in time and space as has already been assigned to it. Winkler 

 mentions specimens from the Middle Oligocene of Belgium ; Eouault 

 and others record the species in France ; Orueta in Spain ; Adams 

 in Malta ; Lawley in Italy (Pliocene) ; and the references to German 

 specimens are far too numerous to mention. 



15. N. repens, Probst. 



1879. 2V. repens, J. Probst, Wiirttb. Jahresh. vol. xxxv. pp. 163-166, pi. iii. 

 figs. 18-22. 



Founded upon some small teeth from the Miocene of Baltringen, 

 Wtirtemberg. The cones are all extremely low, and were perhaps 

 eight in number in the lower teeth, with large anterior serrations : 

 the specific identity of all the specimens figured appears somewhat 

 doubtful. 



16. N. biserratus, Miinster. 

 1842. If. biserralus, Graf von Miinster, "Beitr. Petref." pt. v. p. 66, pi. xv. fig. 9. 



This species was founded upon a small tooth from the Oligocene 

 of Neudorft in the Vienna Basin, but does not appear to have been 

 recorded since its original description. The principal cone is about 

 four times the size of the largest of the secondary cones, and the 

 latter are no less than twelve in number. The eight anterior cones 

 are distinctly serrated on both edges. 



1 Smith "Woodward, " Chapters on Fossil Sharks and Pays.— II.," Science Gossip, 

 vol. xx. (1884), pp. 229, 230. 



