﻿Table I. — Chroxology, 



Hemerae. 



Distinctive Fossil. 



General Ammonite Facies. 



ftlSCtf 



zigzag 



schlcenbacJii 

 trnellii 



garantiana} 



niortensis 



Oppelia fi'sca (Querist.) 



Zigzagiceras zigzag (d'Orb.) 



Parkinsonia scAZfle»6ac//»,Schlippe, 

 Strigoceras truellii (d'Orb.) 



Garantiana garantiana (d'Orb.) ... 

 Strenoceras niortense (d'Orb.) 



blagden i 1 : Teloceras Llagdeni 



Witchelliee 



Shirbuimia 



(olim Sonninice) 

 posb-discitce 



Otoites sauzei 



Witchellia >p 



Skirbuimia trigonalis, sp. nov, 

 Oppelia of pranradiat a type 



Uscitre Byperlioceras discites ( Waagen) 



concavce 



bradfordensis 



Lndivigella concava (J. Sow.) 



Brasilia bradfordensis 



(S. Buckman 

 murchisoixe ... \Lvdicigia mnrcliisonce (J .de C. Sow.) 



Ancolioceras . . . ] A ncolioceras sp 



scissi Tmetoceras scission (Benecke) 



opaliniformis ... Cypholioceras opal ini forme, 



S. Buckman. 

 aalensis ■ Pleydellia aalensis (Zieten) 



| moorei 



Bnmorticrice 



,| Ihimortieria moorei (Lycett) 

 , Dnmortieria spp 



dispansi j PJil i/seoqrammoceras dispansum 



I (Lycett).; 



svruekmanni ' Psendogrammoceras struckmanni, i 



(Denckmann). 

 strtatuli Grammoceras striatulum 



variabilis Hovr/ia variabilis (d'Orb.) 



w Luna inn 



bifrontis Hildoceras bifrons (Bruguiere) 



I 



[folciferi Ha rpoceras falciferum 



I tenuicostati ...j Dactylioceras temiicostatum 



(Young & Bird). 



'' Seguenziceras acutum (Tate) 



■ v /"'"' // Pal topi enroceras spinatum 



Oxynote Oppelids. 



Zigzag Stepheoceratids ; rounded whorled Par 



kinsonian; trigonal whorled Parkinsonice. 

 Stout-whorled, crassicostate Parkinsonice. 

 Compressed Parkinsonice; hollow-keeled, lineate 



Oppelids (Strigoceras) . 

 Evolute Parkinsonian. 

 Ammonites with ribs opposite but well broken 



on periphery (Garantiana) . 

 Bispiuous Ammonites (Strenoceras) . 

 Fine- ribbed craterumbilicates ( Cad omit es ) . 

 Very evolute Parkinsonian. 

 Crassomate craterumbilicates (Teloceras) . 

 Stout hnmphriesiamun types; spheroidal Step heo 



ceratids. 

 Compressed humphriesianum, types (Skirroceras) . 

 Auriculate, spinous spheroids (Otoites). 

 Maminillate Sonninia ; alticarinate Sonniniat. 

 Septicarinati-subsulcate platygyrals (Witchellia) 

 Club-bearing spheroids & subspberoids (JEhnileia). 

 Trigonal whorled Sonninians (Shirbv.irnia) . 

 Ornatilobate, subcarinate & carinate Sonninians. 

 Oppelids with convex periphery. 

 Carinatitabulate Hildoceratids. 

 Quadrate- whorled subcrenulat icarinates (Baplo~ 



pleuroceras) . 

 Concavumbilicate Hildoceratids. 

 Dwarf Ludwigoids (Lndivigella). 

 Fine- ribbed, gradumbilicate Ludwigoids. 

 Smooth gradumbilieates. 

 Crassomate Ludwigoids. 

 Carinate, rostrate Opalinoids (Ancolioceras) . 

 Subcarinate. subrostrate Opalinoids (Lioceras) . 

 Annular ribbed, peripherally broken, Dumor- 



tierians (Tmetoceras) ; crassomate Hammato- 



ceratids, Burton ia. 

 Subcarinate rostrate Opalinoids (Cypholioceras) . 



Jugate-ribbed Grammocerates. 



Paucicostate Grammocerates (Cottesivoldia) . 



Fine-ribbed Dnmortieria'. 



Flexiradiate Dnmortieria'. 



Coarse-ribbed Dnmortieria' ; multicostate & 



periodically constricted Dumortierians (Catul- 



loceras) . 

 Smooth Oxynotes (Hudlestonia) . 

 Nodate Grammocerates ; solid-keeled Hanimato- 



ceratids. 

 Hollow-carinate Grammocerates. 



Solid-keeled (non-septicarinate) Grammocerates 



non-nodate Baugian. 

 Parvinodate Baugia-. 



Crassinodate Haugians (Lillia. etc. = podagrosi). 

 Nearly smooth bifrons types. 

 Ribbed bifrons types. 

 Fibulate Dactyloids (Peronoceras) . 

 Hollow - keeled falciferi (Barjxneras s. sir.) 



genuine sickle-bearers. 

 Annulate Dactyloids ( Dactylioceras). 



Annulate Dactyloids (compressed). 

 Quadrate- whorled crenulaticarinatcs (Palto- 

 pleuroceras). 



1 This term is used in the bod}- of the paper ; but Mascke has made further subdivision here; 

 and his terms should be inserted to make a complete sequence, see p. 56. 



2 These terms are used in the body of the paper, but other terms are necessary. See footnote 2, 

 p. 54. 



