164 
SELACHII. 
1879. Notidanus reeurvus, J. Probst, Wiirtt. Jahresh. vol. xxxv. p. 162, 
pi. iii. figs. 12-17. 
1879. Notidanus primigenius, J. Probst, tom. cit. p. 158,pi. iii. figs. 1-5. 
1879. Notidanus d'anconm, J. Probst, tom. cit. p. 166, pi. iii. figs. 6-11. 
(?) 1880. Notidanus microdon, V. Kiprijanoff, Bull. Soc. Imp. Xat. 
Moscou, pt. i. p. 6, pi. i. figs. 15, 16. 
V^'1885. Notidanus primigenius, F. Noetliug, Abb. Geol. Specialk. 
Preussen u. Thiiring. Staaten, vol. vi. pt. 8, p. 1/, pi. i. fig Si 4, 
1886. Notidanus primigenius, A. S. Woodward, Geol. Mag. [3] vol. iii. 
p. 216, pi. vi. figs. 19, 20, 22 (Pfig. 21). 
Type. Detached teeth ; Munich Museum. 
The limits of this species are at present unsatisfactorily defined. 
The teeth appear to pass, on the one hand, into those of N. serra- 
tissimus, from most of which they can only be distinguished by their 
larger size; and, on the other, they are indefinitely separated from 
the teeth of N. gig as, the lateral mandibular examples of which are 
longer and generally possess a greater number of secondary cones. 
The statement of Agassiz, repeated by the present writer, that the 
teeth of N. primigenius differ from those of N. serratissimus in the 
more acute character of the cones, and the less uniform size of the 
anterior serrations, is shown to be inaccurate by a study of the 
variations in a larger series of specimens ; though the features just 
mentioned are often distinctive. A specific character is also found 
in the lower median tooth, which almost certainly has a well-defined 
median cusp. 
If is probable that the originals of Agassiz’s figs. 4, 5 do not 
pertain to the same species as those of figs. 6-8, 13-17, which are 
regarded as the typical teeth ; but N. reeurvus may be referred, 
with much probability of correctness, to the upper jaw of N. primi¬ 
genius. The localities of most of the type specimens are unknown, 
but they were probably all obtained from the Molasse ; and it seems 
advisable at present to restrict the name to teeth from the Upper 
Eocene and Miocene, no undoubted specimens being known from the 
Pliocene. , 
Form. <Sf hoc. Upper Eocene : S. England and N. Germany. Lower 
. Miocene: Belgium, Hessen-Darmstadt, Wiirtemberg, and Switzer- 
J au db - ScaJPc^'^i 
i^n r. 1224. Two fine teeth; Upper Eocene, Barton Cliff, Hampshire. 
One is figured by the present writer, Joe. cit. pi. vi. fig. 22. 
* Egerton Coil. 
. 
P. 5803. Similar tooth ; Barton Cliff. Enniskillen Coll. 
1 A very doubtful tooth from the Molasse of Montpellier, S. France, is also 
referred to At primigenius by P. Gervais, Pal. Gen, p. 2o9 ; fig. 36 (woodc.). ^ 
cFkz. w ftdfj), /• so ,/. fy. . 
