336 
SELACHII. 
Undetermined species of Cestracion are also indicated by the 
foUowingteeth:^^^^ c 
v/ 47293 a. A very small tooth, and another shown of the natural size 
in PI. XI. fig. 28 ; Gault, Polkestone. Gardner Coll. 
L/28718. Two comparatively narrow teeth much raised mesially; 
Danian Beds, Ciply, near Mons, Belgium. 
Purchased, 1853. 
P. 5836. Small tooth; Ciply. 
Presented by Mons. A. Houzeau de Lehaie , 1888. 
43136. Narrow tooth, (h012 in length, with a prominent longitudinal 
keel and obtusely angulated extremities; London Clay, 
Highgate Archway. Wetherell Coll. 
The following species have also been founded upon detached teeth, 
but there are no examples in the Collection:— 
Cestracion duponti, T. C. Winkler, Archiv. Mus. Teyler, vol. iv. 
/ ( 18 76), p. 17, pi. ii. figs. 1-3^—Bruxellian Eocene; Bel- 
gium. * 
Cestracion polydictyos : Acrodus polydictyos, A. E. Reuss, Yerstein. 
bohm. Kreideform. pt. ii. (1846), p. 97, pi. xxi. figs. 1-8 ; 
C. E. Eischer, Allg. deutsch. Naturh. Zeitung, n. s. vol. ii. 
(1856), p. 139, pi. ii. figs. 29,30; H. B. Geinitz, Palaeontogr. 
vol. xx. pt. i. (1875), p. 296, pi. lxiv. fig. 23; A. Eritsch, 
Rept. u. Eische bohm. Kreideform. (1878), p. 16, woodc. 
fig. 39. Drepanephorus, A. S. Woodward, Geol. Mag. [3] 
vol. iv. (1887), p. 103.—Cenomanian and Turonian; Saxony 
and Bohemia. 
The following dorsal fin-spines are referable in part to Cestracion 
and in part to Synechodus :— 
k / 
47122. Small spine; Gault, Folkestone. 
Gardner Coll. 
>-erc^ 
P. 3199. Two large imperfect specimens; Upper Greensand, Maid¬ 
stone. Enniskillen Coll . 
> 35160. Five fragments : Cambridge Greensand, Cambridge. 
Purchased , 1859. 
P. 5888. Two fragments; Cambridge Greensand, Cambridge. 
Egerton Coll. 
P. 405. Smaller spine; (?) Lower Chalk, Dover. 
Presented by the Earl of Dude, 1881. 
7^; /<rc. /z>.t/u pi ix,p/<r c 
