PLATE XL. 



Fig. Page. 



L Elasmodectes willetti, 'Newton; pair of mandibular dental plates, inner 

 or oral view, nat. size, witli that of right side enlarged three times 

 from within (la) and from above (1 h). The type specimen. — Zone 

 of Holastcr suhglobosus ; Soutlieram, near Lewes. Willett Collection 

 no. 148, Brighton Mnseum. 191. 



2. Ditto ; mandibnlar dental plate seen from above, twice nat. size. — Zone 



of Ilolaster sulxjlohosus ; Burham, Kent. Mrs. Smith's Collection 



(B. M. no. 49024). 191. 



3. Ditto ; left mandibular dental plate, inner view and (3 a) sjmphysial 



surface, nat. size. — Zone of llolaster siihglobosus ; Burham. G. E. 

 Dibley Collection (B. M. no. V. 10047). 191. 



4. Edaj>]i()<]oii sedgiolcl-i (Agassiz); left mandibular dental plate, outer, inner 



(4 rt) and ujiper (4/^) views, two-thirds nat. size. — Senonian zone; 

 Norwich. Bayfield Collection (B. M. no. P. 414). a., beak with 

 tritor; c, il., anterior and posterior outer tritors ; c, median tritor. 185. 



5. Ditto ; vomerine dental plate of same specimen, outer, inner (5 a), and 



lower or oral (oh) views, two-thirds nat. size. 185. 



6. Edai>hu(lon recdi, Newton ; right palatine dental plate, oral view, nat. 



size. — Zone of Hulasfer siihgh)hosti>> ; Grlynde, Sussex. Capron 

 Collection (B. M. no. 49727). a., inner tritor; c, outer tritor. 187. 



7. Itichijodus tliurmaiDii, Pictet and Campiche; right palatine dental plate, 



oral view, showing tritors, nat. size. — Zone of llohi^ter sidnjIoho.sas ; 

 Burham, Kent. Mrs. Smith's Collection (B. M. no. 49019). 189. 



