PLATE XXVI. 



Fr<:. Paoe. 



1. Pachyrhizodus dibleyi, A. S. Woodward ; left premaxilla, inner and (1 a) 



upper aspects, two thirds nat. size. Type specimen. — Zone of 

 Holaster subglobosus ; Bnrharn, Kent. Dibley Collection (B. M. no. 

 P. 9115). i., inner tooth; m., marginal tooth. 128. 



2. Ditto ; left maxilla of same specimen, outer aspect, and (2 a) inner view 



of some displaced teeth, two thirds nat. size, p., antero-internal 

 process for overlap of premaxilla. 128. 



3. Ditto ; lower aspect of anterior end of right maxilla of same specimen, 



showing irregular teeth and antero-internal process (]>.), two thirds 



nat. size. 128. 



4. Ditto ; inner view of teeth of right dentary, two thirds nat. size. — Zone 



of Holaster subglobosus ; Merstham, Surrey. Dibley Collection 



(B. M. no. P. 10042). 128. 



5. Pachyrhizodus gardneri (Mason) ; lower aspect of anterior end of right 



maxilla, showing a tooth-socket and the antero-internal process, 

 two thirds nat. size. — Zone of Holaster subglobosus; Ditchling, 

 Sussex. Capron Collection (B. M. no. 49905). 127. 



(i. Pachyrhizodus sp. ; tail, left lateral aspect, showing remains of anal (a.) 

 and caudal (V.) fins, one half nat. size. — Chalk ; Cnxton, Kent. 

 Harford Collection (B. M. no. P. 5(359). 124. 



