PLATE XI. 
Fig. Pa S e 
1. Hybodus polyprion , Agassiz ; hinder tooth, outer aspect.— 
Stonesfield Slate ; Stonesfield, Oxford. [39203.] 269 
2. Ditto ; tooth, outer aspect.—Ibid. [11124.] 269 
3. Ditto ; tooth, outer aspect.—Ibid. [P. 2845.] 269 
4. Hybodus qrosswonus , Agassiz ; tooth, outer aspect.—Ibid. 
[28590 a.] 271 
5. Hybodus lev is , sp. nov.; tooth, outer aspect, twice nat. 
size.—Ibid. [33474.] 2/0 
6 Ditto : tooth, inner aspect, twice nat. size.—Ibid. 
[P. 2182 d.] 270 
7 Ditto ; tooth, outer aspect, twice nat. size.—Ibid. 
[P. 2845 c.] 270 
8. Hybodus obtusus, Agassiz ; tooth, outer aspect.—Kirarne- 
"ridge Clay: near Weymouth. [41223.] 273 
9,10. Ditto ; two teeth ; outer aspect.—Ibid. [41875.] 273 
11. Ditto ; tooth, inner aspect.—Ibid. [43569.] 273 
12 13 Ditto; two teeth, outer and inner aspects.—Ibid. 
[45927.] 273 
14. Hybodus (cf. striatulus , Agassiz) ; tooth, outer aspect.— 
Wealden; Tilgate Forest, Sussex. [23028.] 276 
15. Ditto; tooth, outer aspect.—Ibid. [2893.] 276 
16. Hybodus , sp. ; tooth, outer aspect.—Ibid. [28420 a.] 277 
17. Synechodus dubrisiensis (Maekie) ; anterior (? upper) tooth, 
outer aspect, three times nat. size.—Chalk; Kent. 
[41675.] 328 
18,19 Ditto; two associated teeth, outer aspect, three times 
nat. size.—L. Chalk; Dover. [47287.] 328 
20. Ditto ; hinder tooth, outer aspect, three times nat. size.— 
Chalk; Kent. [41675.] 328 
21. Synechodus tenuis , sp. nov.; anterior tooth, outer aspect, 
three times nat. size.—L. Greensand ; Maidstone. 
[9297.] 329 
22. 23. Synechodus recurvus (Trautsehold) ; two teeth, outer 
aspect.—Gault; Folkestone. [47220 a, h.] 330 
24, 25.. Oestracion cancdiculatus , Egerton : two associated ante¬ 
rior teeth, outer and inner aspects, three times nat. 
size.—U. Chalk : Guildford. [49735.] 334 
26, 27. Ditto; associated lateral teeth of the same specimen, 
coronal aspect, twice nat. size. [49735.] 334 
25. Cestracion , sp. ; lateral tooth, coronal aspect.—Gault; 
Folkestone. [47293 a.] 336 
29. Cestracion rur/osus (Agassiz) ; lateral tooth, coronal aspect. 
—Chalk; Lewes. [4166.] 335 
