GENERAL OBSERVATIONS. 



401 



Terebratnla Family, gen. Terebratula. 

 Stringocephalus, Rensselaeria 

 Other Terebratulids 

 Crania Family, gen. Crania 

 Calceola Family, gen. Calceola 

 Bryozoans 

 Acephals 



CONCHIFERS 



Monomyaries 



Dimyaries without a siphon 



Dimyaries having a siphon.. 

 Cephalates 

 Pteropods 

 Gasteropods 



Shell without a beak 



Sbell beaked 

 Cephalopods 



Nautilus tribe, including Orthoceras, etc. 

 Ammonite tribe, gen. Gouiatites 



ARTICULATES. 

 Worms 

 Crustaceans 



EXTOMOSTRACANS 



Ostracoids 

 Trilobites.. 



Paradoxides, Conocephalus, Sao 

 Ellipsocephalus, Hydrocepha 

 his, Dicellocephalus, Arionel- 

 lus, Meuocephalus 



Eathijurus Olenus, Agnostus, 

 Ogygia 



Trinucleus, Asaplms, Remopleti- 

 ride.s,Amphion,and Triarthrus 



Calymene, Ampyx, Illaenus, 

 2^ Acidaspis, and Cheirurus 



