212 A. Smith Woodward — On the Genus Notidanus. 



The originals of the figures in Quenstedt's " Handbuch " are very 

 much smaller than the type specimen, and are characterized by the 

 presence of anterior serrations ; it is doubtful, indeed, whether they 

 are truly referable to this form. 



7. N. serkatus, Fraas. PI. VI. Fig. 7. 



1855. N. serratus, 0. Fraas, Wurttemb. Jahresh. vol. ix. p. 98. 



1858. ,, ,, F. A. Quenstedt, " Der Jura," p. 784, pi. 96, fig. 44. 



This species was originally named by Fraas, but does not appear 

 to have been completely defined before the publication of Quenstedt's 

 work on the Jura. The last-mentioned palaeontologist records a 

 group of about 14 teeth, naturally associated, and figures one of the 

 most typical forms. This, as a Jurassic type, is remarkable on 

 account of the number of distinct cones that make up its crown, 

 and the prominence of the sharp denticulations on the front edge of 

 the principal cone ; the latter is comparatively broad and long, and 

 is succeeded by seven minor cones, of which the anterior is very 

 much the largest. The species occurs in the Corallian of Nusplingen, 

 Swabia. 



A detached specimen in the British Museum (No. 35667), obtained 

 by the late Mr. Bean from the Oxford Clay of Scarborough, agrees 

 so closely with the tooth of this species figured by Quenstedt that it 

 cannot be separated on present evidence. The fossil in question is 

 shown of the natural size in Fig. 7, and is in an almost complete 

 state of preservation. The principal cone of the crown is relatively 

 very large, and is succeeded by five secondary cones, while at its 

 base in front there occur three closely approximated denticles, the 

 first being of considerable size. Of the secondary cones, the most 

 anterior is directed sharply backwards and makes a wide angle with 

 the posterior edge of the principal cone ; it is nearly a third larger 

 than that immediately following, and the remaining three are quite 

 small. The base-line of the crown is arched, and the lower border 

 of the root has a somewhat crimped appearance. This is evidently 

 a tooth of the upper jaw, and the respects in which it differs from 

 Quenstedt's figure are precisely those in which the upper teeth of 

 living species differ from the lower. 



8. N. Daviesii, sp. nov. PI. VI. Fig. 8. 



1871. Hybodus poly prion, J. Phillips, " Geology of Oxford," p. 305, pi. xii. fig. 18. 

 The scarcity of remains of Notidanus in the Jurassic rocks of 

 Britain appears somewhat remarkable when it is remembered how 

 frequently they have been recorded on the Continent : and in addi- 

 tion to the Scarborough tooth already described, I have only succeeded 

 in meeting with two other specimens. 1 These were erroneously 

 referred to Hybodus by Professor Phillips, op. cit., and they have 

 been kindly pointed out to me by Mr. William Davies, who recog- 



1 Besides others already named, I have also to thank the following friends and 

 correspondents who have kindly assisted me in the search for Jurassic Notidanida? : — 

 Mr. E. T. Newton, of Jermyn Street ; Mr. T. Eoberts, of the Woodwardian 

 Museum, Cambridge ; Mr. H. M. Platnauer, of the York Museum ; Mr. H. J. 

 Moale, of the Dorset County Museum ; and Mr. H. E. Quilter, of Leicester. 



