336 
SELACHII. 
Undetermined species of Gestracion are also indicated by the 
following teeth : — 
47293 a. A very small tooth, and another shown of the natural size 
in PI. XI. fig. 28 ; Gault, Folkestone. Gardner Coll. 
28718. Two comparatively narrow teeth much raised raosially ; 
Danian Beds, Ciply, near Mens, Belgium. 
Purchased, 1853. 
P. 5836. Small tooth; Ciply. 
Presented hy Mom. A. Ilouzeau de Lehaie, 1888. 
43136. Narrow tooth, 0'012 in length, with a prominent longitudinal 
keel and obtusely angulated extremities ; London Clay, 
Uighgato Archway. Wetherell Coll. 
Tho following species have also been founded upon dctaclied teeth, 
but there are no examples in the Collection : — 
Gestracion dupmiti, T. C. Winkler, Archiv. klus. Tcylcr, vol. iv. 
(1870), p. 17, pi. ii. figs. 1-3. — Bruxcllian Eocene ; Bel- 
gium. 
Gestracion polydictyos : Acrod,us polydietyos, A. E. lleuss, Verstein. 
bbhm. Kreideform. ]it. ii. (1846), p. !>7, pi. xxi. figs. 1-8 ; 
C. E. Fischer, Allg. deutech. Naturh. Zoitung, n. s. vol. ii. 
( 1856), p. 139, pi. ii. figs. 29, 30 ; 11. B. Geinitz, Pala;ontogr. 
vol. XX. x>t. i. (1875), p. 296, iil, Ixiv. fig. 23; A. Fritsch, 
Kept. u. Fische bbhm. Kreideform. (1878), p. 16, woodc. 
fig. 39. IJrepanephorus, A. S. Woodward, Gcol. Mag. [3] 
vol. iv. (1887), p. 103. — Cenomanian and Turonian ; Saxony 
and Bohemia. 
The following dorsal fin-spines are referable in part to Gestracion 
and in part to Synechodus : — 
47122. Small spine; Gault, Folkestone. Gardner Coll. 
P. 3199. Two largo imperfect specimens ; Upper Grcens.and, Jlaid- 
stone. Ennislcillen Coll. 
35160. Five fragments : Cambridge Greensand, Cambridge. 
Purchased, 1859. 
P. 5888. Two fragments ; Cambridge Greensand, Cambridge. 
Eyerton Coll. 
P.405. Smaller spine ; (?) Lower Chalk, Dover. 
Presented hy the Earl of Dude, 1881. 
