PLATE XVI. 



Fiu. Page. 



1. Ophiopsis penicillata, Agassiz; nearly complete fish, showing most of 



squamation from inner face, nat. size, with a group of teeth (1 n), 

 some abdominal flank-scales, inner view (1 b), and some caudal scales, 

 outer view (1 c), enlarged five times. — Probably from Lower Purbeck 

 Beds near Weymouth, Dorset. The type specimen. British Museum, 

 no. P. 7433. 72. 



2. Ditto ; bases of some dorsal fin-rays, five times nat. size. — Lower Purbeck 



Beds ; Isle of Portland. British Museum, no. P. 8375. 73. 



3. Opliiopsis breviceps, Bgerton ; nearly complete fish, nat. size. — Lower 



Purbeck Beds ; Wockley, near Tisbury, Wiltshire. The type speci- 

 men. Museum of Practical Geology, London, no. 28442. 74. 



4. Ditto; roof of skull and some adjacent bones, inner view, five-halves nat. 



size. — Ibid. British Museum, no. P. 9107 a. co., upper circum- 

 orbitals; fr., frontal; pa., parietal; pit., post-temporal; sq., squamosal; 

 st., supratemporal. 74. 



5. Ditto ; right premaxilla, outer view, four times nat. size. — Ibid. British 



Museum, no. P. 9436. 74. 



6. Ditto; right mandibular ramus, outer view, four times nat. size. — Ibid. 



British Museum, no. P. 943G. 74. 



7. Ditto ; portion of operculum to show ornament, four times nat. size. — 



Ibid. Bnniskillen Collection (B. M. no. P. 3G08). • 74. 



8. Ditto; left supraclavicle, outer view, four times nat. size. — Ibid. British 



Museum, no. P. 943G. 75. 



9. 10. Ditto ; flank-scales, outer and inner face, seven and eight times nat. 



size. — Ibid. British Museum, nos. P. 9107 b,c. 75. 



11. Ditto; ventral scale, outer face, six times nat. size. — Ibid. British 



Museum, no. P. 9436. 75. 



12. Ditto; dorsal scale, inner face, eight times nat. size. — Ibid. British 



Museum, no. P. 9107 b. 75. 



13. OpJdopsis dorsalis, Agassiz; nearly complete fish, nat. size. — Probably 



from Middle Purbeck Beds, Swanage, Dorset. The type specimen. 

 Egerton Collection (B. M. no. P. 46G). 76. 



