268 
SELACHII. 
P. 3165. Very long slender spine, wanting posterior denticles, 0'435 
Kimishillen Coll. 
in total length 
37387. Small spine, exsertod 0-14. 
46564. Small spine, 0-143 in total length. 
P. 2167. Small slender spine, exsertod 0-105. 
P. 2805. Small slender spine, exsorted 0-17. 
Purchased, 1863. 
Purchased, 1875. 
Egerton Coll. 
Eiinislillen. Coll. 
P. 2825, P. 2829. Two small spines, exsorted 0-08 and 0-0.9 respec- 
tively. Ennisldllen Coll. 
P. 2817- Much abraded posterior spine, exsertod 0-2. 
Ennishillen Coll. 
An undetermined species allied to Ihjhodus reticulatus is indicated 
by a largo slab from the Lias of Boll, Wiirtemberg (P. 5880), ex- 
hibiting remains of the cartilages of the mandibular, hyoid, and 
branchial arches, with a few imperfect teeth and one dorsal fin- 
spine. 
Hybodus polyprion, Agassiz. 
184.3. Ilyhodm poli/prion, L. Agassiz, Poiss. Foss. vol. iii. p. 185, 
pi. xxiii. figs. 1-15 b 
1871. Ihjlmlm pohjprion, J. 1‘liillips, Geol. Oxford, p 177, diagr. 
.xxxvii. (ig.s. 2, 3. 
1871. Ili/bodus juj/osm, .1. Phillips, op. dt. p. 177, diagr. xxxvii. fig. 1. 
1886. Hylxidiis polyprion, A. S. Woodward, Oool. Mag. [3] vol. iii, 
p. 257, pi. vi. figs. 1, 2. 
Type. Detached teeth ; School of Mines, Paris. 
Teeth with a high much compressed crown ; median cone ob- 
lique, except in the most anterior teeth ; lateral cones two or three 
in number, broad. Coronal surface of the anterior and princi]>al 
teeth smooth, except near the base, where marked by short vertical 
wrinkles ; a few of the superficial wrinkles in the po.sterior teeth 
extending to the apices of the cones. Root short, depressed. 
As already remarked by Agassiz and the present writer, some of 
the teeth of this species exhibit considerable resemblance to those 
of Notidamis. 
Form. Loe. Bathonian (Stoncsfiold Slate) : Oxfordshire and 
(?) Somersetshire *. 
' It is not unlikely that some of these are small tooth of H. gro.mconus. 
“ Quenstedt (I)er J lira, 1858, p. 348, pi. 47. tigs. 21), 30) refers some teeth to 
this species from the Continental “Brauner Jura /3”; the detormin.ation is, 
however, very doubtful. The same may be said of the tooth from the CoraUian 
