148 O-N SQTJATIN-A CRANEI AND BELONOSTOMUS CINCTUS. 



Fig. 4. Posterior side teeth of ditto, twice natural size. 

 4 a. Base of another, under view. 



5. Minute dermal tubercles of ditto, four times natural size. 



6. Large spinous dermal tubercle of ditto, twice natural size. 



7. M-Suxdihle oi £eIo7iostomus cinctus, Agass., viewed from above, two thirds 



natural size. Upper Chalk, Brighton. 



8. Side view of portion of ditto, natural size : d, dentary ; prs, presym- 



physial bone ; s, sutures ; S2jI, splenial. 



9. Another presymphysial bone of ditto, showing suture, natural size. 



Upper Chalk, Brighton. 



9 a. Transverse section of presymphysial bone. 



10. Median presymphysial tooth of ditto, twice natural size. 



11. Lateral presymphysial tootli of ditto, thrice natural size. 



12. 13. Teeth of splenial bone of ditto, side view, thrice natural size. 



13 a. The second, viewed from above. 

 14. Presymphysial bone of Belonorhi/nchus AnnmgicB, Ag. sp., natural size. 

 Lower Lias, Lyme Regis. [Brit. Mus. no. P. 513. J 



The originals of all the figures, except the last, are in the collection of Henry 

 Willett, Esq., F.G.S., Brighton Museum. 



DiscTJSSioisr. 



The Peesident spoke of the clear manner in which the Author 

 had laid before the Societj' the salient points of his paper, with the 

 conclusions of which there appeared to be general agreement. 



