TAELE OF CONTENTS. 



Introductory remarks 



I. SILURIAN AGE. Potsdam Period. 



MOLLTJSCA .... 



Class Brachiopoda 

 Family LingulidjE 

 Genus Lingulepis . 



Lingulepis pinniformis 

 prima . 

 Genus Obolella . 

 Obolella nana 

 Class Gasteropoda 

 Subclass Pteropoda 

 Order Theoosmata 

 Family Cavolinid^ . 



Genus Theca . 



Theca gregaria 



Articulata 



Class CRUSTACEA . 



Subclass Entomostraca 



Order Trilobita 



Family Paradoxid^e 



Genus Agraulos 



Agraulos 



Agraulos Oweni 



1 



T 

 7 



1 



7 



9 



10 



II. CAEBONIFEEOUS AGE. Carboniferous Period. 



Protozoa 



Class Rhizopoda . 

 Order Foraminifera . 

 Family CAMERiNiDiE 

 Genus Fusulina 



Fusulina cylindrica 



MOLLTJSCA .... 



Class Brachiopoda 

 Family Spiriferid^ . 

 Genus Spirifer 

 Subgenus Spirifer 

 Subgenus Trigonotreta 

 Subgenus Martinia . 



Spirifer planoconvexus 

 Family ProductidjE . 

 Genus Chonetes . 



Chonetes mucronata 

 Family Strophomenid^ 

 Genus Hemipronites 



Hemipronites crassus 

 Class Lamellibranchiata . 

 Family Pteriidje = ( AvicuLiD.a;) 

 Subfamily Pteeinii^ 

 Genus Myalina . 



Myalina perattenuata 



32 



subquadrata 



. 32 



Subfamily Pterhn^ 



28 



Subfamily MeliniNjE . ; 



28 



Family CRASSATELLIDiE 



34 



Genus Pleurophorus 



34 



Pleurophorus occidentalis 



35 



Family AnatiniDjE . 



36 



Genus Allorisma . 



36 



Allorisma subcuneata 



3T 



Genus Sedgwickia 



38 



Sedgwickia topekaensis . 



40 



? concava 



41 



? altirostrata . 



41 



Genus Chtenomya . 



42 



Chasnomya leavenworthensis 



43 



Cooperi 



44 



Class Gasteropoda 



44 



Subclass Prosobranchiata 



44 



Order Riphidoglossata 



44 



Suborder Podopthalma 



44 



Family Pleurotomarhd^ 



44 



Genus Pleurotomaria 



45 



Pleurotomaria humeros 



a 46 



subturbinat 



a 47 



( iii ) 





