PLATE V. 



Fig. Page. 



1. Hi/lxobatis problematka, gen. et sp. nov. ; crown of tooth from above and 



below (1 a), anterior view (1 b), hinder view (1 c), and two end views 

 (1 d, 1 e), three times nat. size. — Wealden ; Brook, Isle of Wight, 

 The type specimen. York Museum. 19. 



2. Ditto ; half -worn crown of tooth, in upper and anterior view (2 a), three 



times nat. size. — Ibid. York Museum. 20. 



3. Ditto ; crown of large tooth, upper view and transverse section (3 a), 



three times nat. size. — Wealden ; Sevenoaks, Kent. Sedgwick 

 Museum, Cambridge. 20. 



4,5, Ditto; two worn teeth, upper view, three times nat. size. — Ibid. 



Sedgwick Museum, Cambridge. 21. 



G. Lepidotus minor, Agassiz; inner view of vertically crushed head and 

 anterior scales, nat. size. — Middle Purbeck Beds ; Swanage, Dorset, 

 Egerton Collection (B. M, no. P, 1118). co., circumorbitals; /r., 

 frontal ; Did., mandible showing splenial teeth ; op., operculum ; orb., 

 orl)it ; j)^., parietal ; pmx, premaxilla ; po., postorbital ; "pop., pre- 

 operculum ; ptt., post-temporal; scl., supraclavicle ; sq., squamosal; 

 St., supratemporal. 21). 



7. Ditto; liead in upper and left side view, nat. size. — Ibid, Cunnington 



Collection (B. M. no. 36080). Lettering as in fig. 6. 29. 



8. Ditto ; imperfect head with base of pectoral fin and some anterior scales, 



left side view, nat. size. — Ibid. Museum of Practical Geology, 

 London, no. 27974. ag., angular; br., branchiostegal rays; ch., 

 ceratohyal ; d., dentary; iop., interoperculum ; p)d., postclavicular 

 scales; j9ro., preorbitals; .sop,, suboperculum; other letters as in fig. G. 29, 



9. Ditto ; parasphenoid, nat. size. — Ibid. Egerton Collection (B. M. no. 



P. 1121 a). 29. 



10. Ditto ; left hyomandibular, outer view, nat, size. — Ibid. B. M. no. 



44848, 30. 



11 Ditto; left premaxilla, outer view, nat. size. — Ibid. Beckles Collection 



(B. M. no. 48255). 30. 



