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COLLYRITIDiE. 



The family Collyritid.^ includes at present four genera Disaster, CoUi/rites, Metapo- 

 rhimis, and Grasia, which are limited to the Oolitic and Cretaceous rocks. The most 

 ancient form at present known was found in the Lias; the species attained their 

 greatest development in the middle division of the Oolites, are sparingly found in the 

 Neocomian, and Lower Cretaceous rocks, and finally disappear with the White Chalk. 



The following table exhibits the stratigraphical distribution of the Oolitic species 

 of this family. 



Stratigraphical Distribution of the Oolitic Species of the Collyritidjs. 



List of Species. 



Disaster. 



Disaster granulosus, Desml. 

 anastero'khs, Leym. 

 Moeschii, Desor 



Collyrites, 



Colhjrites prior, Desor 



ringens, Desml. . 

 ovalis, Leske 

 eUiptica, Desml. . 

 castanea, Desor . 

 transversa, D'Orbig. 

 hicordata, Leske . 

 carinata, Desml. . 

 capistrata, Desml. 

 Buchii, Desor 

 Voltizii, Agass. . 

 Desoriana, Cotteau 

 pinguis, Desor 

 Orbigniann, Cotteau 

 Loryi, Alb. Gras. 

 acuta, Desor 

 conica, Cotteau . 

 faha, Desor > 



Metaporhinus. 



Metaporhiniis Michelinii, Cott. . 

 „ Censoriensis, Cott. 



Grasia. 

 Grasia elongata. Alb. Gras. 



a 



Type localities. 



Amberg, Streitberg, Wiirtemberg. 

 Bar-sur-Aube (Aube). 

 Kornberg (Argovie). 



Frick, (Canton d' Argovie). 

 England, France, Switzerland. 

 England, France, Switzerland. 

 Chaufour, Mamers (Sarthe). 

 St. Croix, de Pouillerel. 

 Escragnolles (Var). 

 England, France, Switzerland. 

 Gunsberg (Canton Soleure.) 

 Wurtemberg, Switzerland. 

 Sircbingen, Wurtemberg. 

 Voirons pros Geneve. 

 Chatel-Censoir, Druges (Yonne). 

 Botzberg, Geissberg (Argovie). 

 Stigny (Yonne). 

 Echaillon (Isere). 

 Villiers-les-Hauts (Yonne). 

 Pacy, Ancy-le-Franc (Yonne). 

 Ueken pres d'Effingen (Argovie). 



Chatel-Censoir (Yonne). 

 Chatel-Censoir (Yonne). 



Echaillon (Isere). 



