CLIFFS AT BLACKGANG CHINE. 233 



successional teeth are traceable behind the ante- 

 rior series. These teeth, as shown in Ugn. 19, have 

 a central cusp rather hooked, and two lesser points 

 on each side. 



LIGN. 19. — FIVE TEETH ATTACHED TO A PORTION OF THE JAW OF A 

 FISH OF THE SHAUK FAMILY; FROM ATHERF1ELD. 



(Hybodus bassanus, of Sir P. Egerton. Geol. Journal, vol. i. pi. iv.) 



The Hybodonts, like other fishes of this family, 

 were armed with strong dorsal spines, which are 

 often found in the lias, oolite, and wealden strata ; 

 and rarely, in the chalk.* 



The Cliffs at Blackgang Chine. — Proceed- 

 ing from Atherfield Cliffs eastward, the first inter- 

 esting point is Blackgang Chine ; a spot well 

 known to every tourist who visits the Undercliff. 

 Viewed from the sea-shore at low water, especially 

 when the springs which feed the waterfall have 

 been swollen by heavy rains, the effect is highly 



* Capt. Ibbetson's specimen is in the Polytechnic Institution on a pedestal 

 at the entrance of the Isle of Wight model-room. It is figured and described 

 by Sir Philip Egerton in " Geol. Journal," vol. i. p. 197. Unfortunately, the 

 drawing was made before the bones of the face and jaws were cleared of the 

 adherent stone, and it therefore represents only the margin of the jaws with 

 the teeth, surrounded by a shapeless mass. 



