INDEX 



abrupta, Irvingella, 21 

 accincta, Irvingella, 21 

 Acrocephalites, 79 

 adamsensis, Irvingella, 24 

 aduncus, Stenopilus, 60 

 affinis, Chariocephalus, 8 



Berkeia, 96 

 agrarius, Chariocephalus, 8 

 Agraulos (?) thea, 2 

 agrestis, Irvingella, 17 

 alberta, Blountiella, 61 



Drumaspis, 29 



Irvingella, 23 



Maryvillia, 70 

 albertensis, Arapahoia, 46 



Cholopilus ( ?), 37 



Coosia, T2> 



Illaenurus, 38 



Plethometopus, 47 

 alia, Irvingella, 16 

 alpersensis, Iddingsia, 88 

 alta, Burnetia, 80 



Irvingella, 19 

 anatina, Iddingsia, 89 

 angustata, Berkeia, 93 

 angustatus, Chariocephalus, 9 

 angustilimbata, Parairvingella, 25, 26 

 ara, Kingstonia, 51 



Ucebia, 51 

 Arapahoia, 43 



albertensis, 46 



elongata, 45 



polita, 45 



prolixa, 46 



reesidei, 44 



stantoni, 44 



typa, 44 



walcottae, 46 

 arbucklensis, Irvingella, 14 

 arctica, Irvingella, 13 

 ardmorensis, Irvingella, 18 

 arguta, Bynumia, 53 

 argutus, Ellipsocephaloides, 63 



bacca, Irvingella, 20 

 Stenopilus, 59 



badgerensis, Chariocephalus, 12 

 banffensis, Meteoraspis, 72 

 Bathynotus, 2 



bearensis, Ellipsocephaloides, 65 

 bellus, Chariocephalus, 6 

 Berkeia, 79, 90 



affinis, 96 



angustata, 93 



comes, 90 



jucunda, 93 



missouriensis, 94 



nevadensis, 91 



retusa, 92 



saratogensis, 91 



sculptilis, 93 • 



wichitaensis, 92 

 bicincta, Iddingsia, 87 

 bilobata, Pterocephalina, "JT, 78 

 bilobatus, Dicellocephalus, 'n 



Dikellocephalus ( Pterocephalus ) , ']^ 



Platycolpus, 78 

 Blountia, 60 



(?) disparilis, 61 



kindlei, 60 



plana, 60 

 Blountiella, 61 



alberta, 61 

 bosworthensis, Kingstonia, 48 

 brevifrons, Elvinia, 98 

 brevis, Coosella, 76 

 bridgei, Elvinia, 97 

 briscoensis, Bynumiella, 57 



Drumaspis, 30 



Ellipsocephaloides, (i}^ 

 bulla, Chariocephalus, 7 

 burlingi, Chariocephalus, 12 

 burnetensis, Irvingella, 20 

 Burnetia, 79, 80 



alta, 80 



cava, 83 



curta, 83 



ectypa, 82 



edwardsi, 84 



exilis, 81 



extensa, 81 



intermedia, 80 



131 



