CONTENTS. IX 



The smaller fossil Foraminifera of the Panama Canal Zone — Con. 



Description of species — continued. Page. 



Polystomella striato-punctata 74 



sagra 75 



macella 76 



crispa 76 



craticulata 77 



species 77 



Amphistegina lessonii 77 



Quinqueloculina seminulum 78 



contorta 79 



auberiana 79 



undosa 79 



bicornis 80 



panamensis 80 



Sigmoilina tenuis 81 



asperula 81 



Triloculina trigonula 82 



tricarinata 82 



bulbosa 83 



projecta 83 



Biloculina bulloides 84 



Spiroloculina excavata : 84 



Orbiculina adunca 84 



Explanation of plates 85 



Index i 



The larger fossil Foraminifera of the Panama Canal Zone. By Joseph 



Augustine Cushman 89 



Introduction 89 



List of species and their geologic occurrence 90 



Description of species 91 



Lepidocyclina canellei 91 



chaperi 92 



vaughani 93 



macdonaldi 94 



panamensis 94 



duplicata 96 



Heterosteginoides panamensis 97 



Orthophragmina minima 97 



Nummulites panamensis 98 



davidensis 98 



Orbitolites americana 99 



Explanation of plates 99 



Index i 



Fossil Echini of the Panama Canal Zone and Costa Rica. By Robert 



Tracy Jackson 103 



Introduction. 103 



List of species and their geologic occurrence 103 



Description of species 104 



Clypeaster lanceolatus 104 



gatuni ? 105 



Encope annectans 106 



platytata 108 



megatrema 110 



Echinolampas semiorbis. ". 112 



