PLATE XXV. 



Fig. Page. 



1. Pachyrhizodus basalis, Dixon; right premaxilla, upper and (1 a) anterior 



aspects, nat. size. Type specimen. — Chalk ; Kent. Mrs. Smith's 

 Collection (B. M. no. 4-9014). L, inner tooth ; ra., bases of marginal 

 teeth. 125. 



2. Ditto ; portion of right premaxilla, inner aspect, showing two large 



inner teeth. — Chalk; Kent. Harford Collection (B. M. no. P. 5655). 125. 



3. Pachyrhizodus gardnerl (Mason) ; incomplete right premaxilla, upper, 



anterior (3 a), and outer (3 b) aspects, two thirds nat. size. — Zone 

 of Holaster subglobosus ; Burham, Kent. Taylor Collection (B. M. 

 no. 33257). i, inner tooth ; m., marginal teeth. 127. 



4. Ditto ; incomplete left premaxilla, oral aspect, with (4 a) outer view of 



a marginal tooth, two thirds nat. size. — Ibid. Toulmin Smith 

 Collection (B. M. no. 41674). />., partially absorbed base of marginal 

 tooth: z'., inner tooth ; m., marginal tooth ; ,<?., vacant tooth-socket. 127. 



5. Ditto ; greater part of left maxilla of same specimen, outer aspect, two 



thirds nat. size. 127. 



6. Ditto ; portion of right dentary of same specimen, inner aspect, showing 



teeth on a ledge and inside a thin wall, two thirds nat. size. 127. 



7. Ditto ; greater part of left mandibular ramus, outer aspect, showing 



partly displaced articulo-angular (aW.),two thirds nat. size. — Zone 



of Schloenbachia varians ; Glynde, Sussex. B. M. no. P. 9016. 127. 



8. Ditto ; right dentary, lower and (8 a) outer aspects, two thirds nat. size. 



— Zone of Holaster subglobosus ; Burham, Kent. Harford Collection 



(B. M. no. P. 5656). i., small inner symphysial tooth. 127. 



