160 
SKLACHII. 
number of the cones, and the relatively greater extent of the anterior 
serrated margin ; the crown beneath and in advance of the principal 
cone is produced far down upon the root. As suggested by Probst, 
it is not impossible that the lower median tooth referred by Lawley ' 
to N. primigenius may belong to this species; it has no definite 
median cone. The anterior upper teeth from the Pliocene of 
Tuscany described by Lawley * as N. primigenim and N. recurvus 
are also probably referable to N. gigas. 
Fig. 7. 
Teeth of Nofidanus gigas. Red Crag, Suffolk. 
N. meneghinii appears to bo founded upon the less abraded teeth 
of this species. 
Form. ^ Loc. Pliocene : N. Italy and S.E. England. 
47019. Portions of two large teeth ; Oreiano, Tuscany. 
Purchased, 1875. 
P. 5804. Worn fragment ; Red Crag, Eolixstowo, Suffolk. 
Brown Coll. Presented hy l^of.Sir Richard Owen, K.C.B.,\S59 . 
P. 5574. Complete tooth with eleven cones ; Red Crag, Felixstowe. 
Harford Coll. 
P. 5575. Imperfect tooth ; Red Crag, Orford Castle. Harford Coll. 
P. 5576. Two smaller teeth, doubtfully assigned to this species ; 
Red Crag, Suffolk. Harford Coll. 
The following species have also been founded upon detached 
teeth, but there are no examples in the Collection ; — 
Notidanus anomalus, R. Lawley, Atti Soc. Tosc. vol. iii. (1877), 
p. 74, pi. iii. fig. 6; A. S. Woodward, Geol. Hag. [3] 
vol. iii. p. 256. — Pliocene ; Tuscany. 
Notidanus aptiensis, F. J. Pictet, Ann. Soc. Lit. Sci. et Art. Apt. 
* Atti Soc. Tosc. vol. iii. pi. i, fig. 4. 
* Tom. cif. pp. 66, 69. pi. i. figs. 2, 3, 5, pi. ii. fig. 1. 
