CHRONOLOGICAL 



39 



Plate, 

 i. — ibulatum. 

 Peronoceras fibulatum, J. de C. Sowerby sp. 1823, 



G.-t 683 



praepositum, nov 701 



Porpoceras andraei, Simpson sp. 1843 57 



perarmatum, Young & Bird sp. 1822 . . 50 



verticosum, nov 91 



vortex, Simpson sp. 1855. G.-t 29a, b. 



vorticellum, Simpson sp. 1855 . . . . 90 

 Spinicceloceras annuliferum, Simpson sp. 1855 .. 63 



h. — bifrons. 

 Curvidactylites curvicosta, S. Buckman 1927 



G.-t 708 



Hildoceras bifrons, Bruguiere sp. 1789 114a, b. 



hildense, Young & Bird sp. 1822 . . . . 667 

 walcotti, J. Sowerby sp. 1815 .. .. 773 



773a. 

 Koinodactylites communis, J. Sowerby sp. 1815. 



G.-t 707 



Lobolytoceras perlobulatum, nov. G.-t. [siemensi. . 440 



440* 

 440a. 

 Multicoeloceras multum, S. Buckman 1926. G.-t. . . 785 

 Nomodactylites temperatus, S. Buckman 1927. G.-t. 731 

 Planulites sulcatus, Lamarck sp. 1801. G.-t 393 



g. — lobatum. 

 Harpoceras falciferum, J. Sowerby sp. 1820. G.-t.. . 764 



764a. 

 Lobodactylites lobatum, S. Buckman 1926. G.-t. . . 730 

 Peridactylites consimilis, S. Buckman 1927. G.-t. . . 778 



/. — vermis. 

 Vermidactylites vermis, Simpson sp. 1855. G.-t. . . 68 



68a. 



e. — subcarinata. 



Arcidactylites arcus, nov. G.-t. 657 



Crassicoeloceras crassum, Young & Bird sp. 1828 .. 119 

 foveatum, Simpson sp. 1855 . . . . 69 

 Frechiella subcarinata, Young & Bird sp. 1822. 



G.-t 23 



23a. 



? Harpoceras concinnum, nov 742 



d . — pseud ovatum . 

 Ovaticeras ovatum, Young & Bird sp. 1822. G-t.. . ma. 



pseudovatum, S. Buckman sp. 1910 .. nib, c. 



c. — Harpocerate (small). 



b. — Hildoceratoides. 



Hildoceratoides propeserpentinus, nov. G.-t 218 III iii, 21. 



serpentinus, Reinecke sp. 1818 . . 138a. Ill viii, 19. 



138c. VI x, 26. 



Orthildaites orthus, nov. G.-t 444 V xii, 23. 



a. — crassoides. 

 Nodicceloceras crassoides, Simpson sp. 1855 .... 89 II xi, 13. 



89a. VII viii, 27. 



13. Harpoceratan. 



t. — metorchion. 



Orcholytoceras appropinquans, nov 681 VI xii, 26. 



metorchion, nov. G.-t 666 VI x, 26. 



