via 



YORKSHIRE TYPE AMMONITES 



Dec. 



Apotypes — Supplementary types. 

 These are types for descriptions later than the original one. 



IcoTYPES — Typical Specimens. 



Topolype 

 Metatype 



an example from the original locality 



(and zone) . 



a topotype named by the author. 



Genotypes— Types of Genera. 

 Genoholotype the one, or chief ^ type 



Genosyntype 

 Genolectotype 



a partner > 



a later selected J 



of 

 genus. 



A genolectotype must be chosen out of genosyntypes. 



Bibliographic Terms. 



Proiolog 

 Protograph 



Descriptive Terms 



Area : — 



Dorsum 



Side 



Venter 



Sides : — 



convergent 

 divergent 



Umbilicus : — 



concav- ~\ 

 crater- \ 

 grad- J 



Venter : — 



fastigate 



concavi- 

 convexi- 

 plani- 



the original description, 

 the original figure. 



antiperipheral or dorsal area. 



lateral area. 



peripheral or ventral area. 



sloping towards venter, 

 sloping towards dorsum. 



umbilicus 



basin -shaped 



crater-like 



step-form 



umbilicus. 



like ridge-roof of a house, hence : 



with concave ^ 

 fastigate with convex > slopes 

 with plane J 



silicate 



carinatisulcate 



tabulate 



carinatitabulate 



somewhat narrower than concave 



hence, 

 sulcate, but with a keel ; a keel 



between two furrows, 

 level across ; hence, 



level, but with a keel. 



