1919 POSTSCRIPT c 



II, Chronological Analysis 



(Pis. I-CXXX. In approximate chronological order — late to early — in each age). 



Age* Genera 



DIVESIAN : Prorsiceras, Eboraciceras, Vertumniceras, Pachyceras, 

 (115-118) Quenstedtoceras. 



CALLOVIAN : Peltoceras, Perisphinctes, Longs viceras, Pseudocadoceras, 

 (98, 99. 113. 121) Phlycticeras. 



BAJOCIAN : Otoites. 



(81) 



YEOVILIAN : Alocolytoceras, Pseudogrammoceras, Pleurolvtoceras. 



(70, 79, 88) 



WHITMAN : Phymatoceras, Haugia, Denckmannia, Whitbyiceras, 

 (4. 5. 9-15. 23, 29-31, 34, Pseudolioceras, Peronoceras, Porpoceras, 

 6q~ 4 8o 5 8'-8 37 ' 8 59 ~ 63 ' 106 Dactylioceras, Cceloceras, Hildoceras. 

 107, 1 10, in, n^iig) 10 Frechiella, Ovaticeras, Harpoceras, Har- 



poceratoides, Phylloceras, Trachylytoceras, 

 Eleganticeras, Elegantuliceras. 



DOMERIAN : Dactylioceras, Tiltoniceras, Paltopleuroceras, Amauro- 

 (1, 22, 24, 25, 37, 51, 52, 58, ceras, Amaltheus, Anisoloboceras, Seguen- 

 74. 77. 79. 109. 125) ziceras. 



CHARMOUTHIAN : Oistoceras, Defossiceras, Beaniceras, Androgyno- 

 (2, 3, 16, 21, 26-28, 32, 33, ceras, Liparoceras, Tragophvlloceras, Fim- 

 "X 8 4 2%4 53, [9 2] 4 ' 94 5 ' 95 C96]' W^ ™. Platypleuroceras, Polymor- 

 102-105, 108, 123? 129, 130) phites, Uptonia, Phncodoceras, Deroceras, 



Echioceras. 



SINEMURIAN : Oxynoticeras, Bifericeras, iEtomoceras, Androgyno- 

 (6-8, 19, 28, 35, 36, 38-40, ceras, Parechioceras, Gagaticeras, Arietites, 

 47-49. 54-56, 66, 67, 75. 78. Schlotheimia, Xipheroceras, Araioceras, 



IOO, IOI, 112, I20, 122, I24, . . r 



127, 128) Agassiceras. 



HETTANGIAN : Caloceras. 

 (17. 18) 



Postscript 



The second Volume of Yorkshire Type Ammonites with 83 Plates 

 illustrating 68 species is now presented with title-page and index for 

 binding. The two volumes of 18 parts contain 163 plates illustrating 

 137 species. This does not finish the illustration of the type Ammonites 

 of Yorkshire, but it completes, so far as circumstances have allowed, the 

 work which was projected. A continuation illustrating the Yorkshire 



