286 
SELACHII. 
series are indicated, seven as in the type specimen, and 
one additional hinder row. The proportions, however, 
are slightly different, as shown by the following measure¬ 
ments :— 
Series. 
No. of teeth 
preserved. 
Length of 
tooth. 
I. 
7 
0*017 
II. 
8 
0*022 
III. 
8 
0*028 
IV. 
8 
0*046 
V. 
8 
0*049 
VI. 
8 
0*031 
VII. 
7 
0*014 
VIII. 
2 
0*008 
In the first three series the teeth are relatively very 
broad, with rapidly tapering extremities; those of series 
iv. are blunt at each end, but narrowest anteriorly, and 
slightly bent at a faintly marked constriction near this 
extremity ; the teeth of series v. are narrowest and least 
blunt posteriorly; the front half of each tooth of series 
vi. is much broader than the hinder half, gradually 
tapering posteriorly; the teeth of series vn. are nearly 
the same in breadth throughout, somewhat tapering at 
each extremity; and those of series viii. are almost tri¬ 
angular, with the outwardly directed apex rounded, and 
the longitudinal divisional line of the surface-ornament 
arched. Of series i., three teeth show signs of wear; of 
ii., three ; of hi., three ; of iv., three ; of v., four ; and 
of vi., vii., and viii., impe but two exhibit distinct traces. 
Enniskillen Coll. 
P. 2740. A group of naturally-arranged teeth of series v., vi., vii., 
partly figured, of the natural size, in PI. XIV. fig. 3. The 
teeth of series vi., vii. are much longer in proportion to 
those of series v. than in Xo. P. 2739, the former mea¬ 
suring respectively 0037 and 0*018, while the latter 
measure only 0*045. Enniskillen Coll. 
P. 2741. Eight teeth of series vi., naturally arranged, with indi¬ 
cations of series v. and vii., and two of the hindermost 
triangular teeth. Enniskillen Coll. 
P. 2742. Forty-eight scattered, but naturally associated teeth, 
mostly very similar to those of Nos. P. 2737, P. 2739, 
hut somewhat larger. Enniskillen Coll. 
