CHRONOLOGICAL 



4i 



Plate, 

 g. — Elegantuliceras. 

 Elegantuliceras elegantulum, Young & Bird sp. 1828. 



G.-t 93 



ovatulum, Simpson sp. 1855 . . . . 106 



/. — tenuicostatus. 

 Kryptodactylites semicelatus, Simpson sp. 1843. 



G.-t .. 31 



31a. 

 ? Peronoceras turriculatum, Simpson sp. 1855 . . 30 

 Tcnuidactylitcs tenuicostatus, Young and Bird sp.1822. 



G.-t 157 



I57a. 



e. — Tiltoniceras. 

 ? Athlodactylites crassulosum, Simpson sp. 1855 . . 58 

 Tiltoniceras costatum, S. Buckman 1913 97 



d. — athleticus. 

 Athlodactylites athleticus; Simpson sp. 1855. 



G.-t 51a, b. 



Simplidactylites crassiusculum, Simpson sp. 1855 . . 209 



c. — directus. 



Orthodactylites directus, nov. G.-t. 654 



mitis, nov 738 



b. — helianthoides. 

 Xeinodactylites helianthoides, Yokoyama sp. 1904 



G.-t. 699 VI ii, 27. 



a. — palHii. 



Paltarpites paltus, nov. G.-t .. 362a. IV xii, 22. 



362b. IV ii, 23. 



12. Amaltheian. 



m. — hawskerense. 

 Paltopleuroceras hawskerense, Young & Bird sp. 1828 408 IV viii, 23. 



I. — regular e. 

 Paltopleuroceras regulare, Simpson sp. 1855 .... 77 II viii, 13. 



k. — spin a turn. 



Amaltheus reticularis, Simpson sp. 1843 1 I 



Paltopleuroceras birdi, Simpson sp. 1843 24 I 



bisulcatum, Bruguiere sp. 1789 . . 392 IV 



buckmannii, Moxon sp. 1841 . . 199a, b. Ill 



? 199c. V 



elaboratum, Simpson sp. 1884 22 I 



solitarium, Simpson sp. 1855 52 I 



/. — argutus. 



Argutarpites argutus, nov. G.-t 363 IV 



Platyharpites platypleurus, [nov.]. G.-t 698 VI 



i. — gibbosa. 



h. — margaritatus. 

 Amaltheus sedgwickii, J. Buckman sp. 1844 .. .. 125 II iv, 18. 



Anisoloboceras nautiliforme, J. Buckman sp. 1844. 



G.-t 37a, b, 



c, d. I iv, 11. 



Lytoceras furcicrenatum, nov 784a, b, c. VII vi, 28. 



