160 
SELACHir. 
Notidanus lauceolatus, A. S. Woodward. 
1886. Notidanm lanceulatus, A. S. Woodward, Geol. Mag. [3] vol. iii. 
p. 214, pi. vi. fig. 10. 
Type,. Detached tooth ; British Museum. 
An imperfectly defined species, founded apparently upon an upper 
tooth, remarkable for the length and slenderness of the coronal 
cones, which are few in number ; the two anterior denticles are of 
large size. 
Form. ^ Loc. Gault : (?) Folkestone. 
P. 1227. Typo specimen. Eyerton Coll. 
Notidanus micro don, Agassiz. 
1822. Tooth of Squaltia?, G. A. Mantell, Foss. South Downs, p. 227, 
pi. xxxii. fig. 22. 
1843. Notidanus miarodon, L. Agas.siz, Poi.ss. Foss. vol. iii. p. 221, 
pi. xxvii. fig. 1, pi. xxxvi. figs. 1, 2. 
(P) 1843. Notidanus pectinatus, L. Agassiz, tom. cit. p. 221, pi. xxxvi. 
fig. 3. 
1846. Notidanus microdon, A. E. Reus.s, Verstein. bohm. Kreideforni. 
pt. ii. p. 98, pi. xlii. fig. 8. 
1850. Notidanus mirrodon, II. B.Geinitz,Charact. Schiclit. u. Potrefakt. 
sachs.-bilhni. Kreidegeb. 2nd. edit. p. 38, pi. ix. fig. 2. 
1850. Notidanus microdon, F. Dixon, Foss. Su.ssex, pi. x.xx. fig. 30. 
1876. Notidanus microdon, II. B. Geinitz, Palfeontogr. vol. xx. pt. ii. 
p. 210, pi. xl. fig. 1. 
1878. Notidanus microdon, A. Fritscb, Kept. u. Fiaohe biihm. Kreide- 
fonn. p. 12, woodc. fig. 25. 
1880. Notidanus microdon, A. S. Woodward, Geol. Mag. [3] vol. iii. 
p. 213, pi. vi. figs. 10-15. 
1888. Notidanus microdon, A. S. Woodward, Proc. Geol. Assoc, vol. x. 
p. 287. 
Type. Detached tooth. 
Principal cone of lower lateral teeth relatively large, sometimes 
slender and acutely pointed ; secondary cones not more than seven 
in number; anterior denticulations numerous and fine, but well- 
marked. 
The teeth commonly referred to this species exhibit considerable 
variations, but none of the observed differences can at present be 
regarded as of specific value. A series from the English Chalk is 
described and figured by the present writer, lor. cit. 
Form, cj- Loc. Cambridge Greensand : Cambridge. Chalk ; Bohemia, 
Germany, and S.E. England. 
