IV 



TABLE OF CO Is' TENTS. 



III. CARBONIFEROUS AGE. PERMIAN PERIOD. 



PAGE 



MOLLPSCA 



Class LAMELLIBRANCHIATA . .48 



Family PECTINID^E . .48 



Subfamily PECTININ^B ... 48 



Subfamily AVICULOPECTININ.ZE . 50 



Genus AVICULOPECTEN . . 50 



Aviculopecten ? . 50 



McCoyi . 50 



Family PTEEIID^; . . .51 



Subfamily PTERINHN^; . . .51 



Genus MYALINA . . . .51 



Myalina aviculoides . . 51 



permiana . . 51 



Subfamily PTERINIINJE . . .53 



Genus EUMICROTIS ... 53 



Eumicrotis Hawni . . 54 



var. ovata 55 



Subfamily MELININ^E . . .56 



PAGE 



Genus BAKEVELLIA . . .56 



Bakevellia parva . . 57 



Family TRIGONIID.*: . . . .57 



Genns SCHIZODUS . . . .58 



Schizodus ovatus ... 59 



Family NUCULID^; .... 59 



Subfamily NUCULANIN^E ... 60 



Genus YOLDIA .... 60 



Yoldia ? subscitula . . 60 



Subfamily MALLETIN^E ... 60 



Family CRASSATELLID^E . . .61 



Genus PLEUROPHORUS . . .61 



Pleurophorus ? subcuneatus . 61 



? Calhouni . 62 



Class CEPHALOPODA ... \ 63 



Order TETRABRANCHIATA ... 63 



Family NAUTILID^E ... 63 



Genus NAUTILUS .... 64 



Nautilus eccentricus . . 65 



IV. REPTILIAN AGE. JURASSIC PERIOD. 



RADIATA . . .66 



Class ECHINODERMATA . . . .66 



Order CRINOIDJE .... 66 



Family PENTACRINID^E ... 66 



Genus PENTACRINITES ... 66 



Pentacrinites asteriscus . 67 



MOLLUSCA 68 



Class BRACHIOPODA . . . .68 



Family LINGULID-S; .... 68 



Genus LINOULA . . . .68 



Lingula brevirostris . . 69 



Family RHYNCHONELLID^E . . .70 



Genus RHYNCHONELLA . . .70 



Rhynchonella ? . . 71 



Class LAMELLIBRANCHIATA . . .72 



Family OSTREID^E .... 72 



Genus OSTREA . . . .72 



Ostrea Engelrnanni . . 73 



Genus GRYPH^EA . . . .74 



Gryphaea calceola var. nebrascensis 74 



Family PECTINIDJE . . . .76 



Subfamily PECTININ..E . . .76 



Genus CAMPTONECTES . . ' . 76 



Camptonectes bellistriatus . 77 



? extenuatus . 78 



Family PTERIID.*: .... 79 



Subfamily PTERIIN./E ... 79 



Genus PTERIA . 79 



Subgemis OXYTOMA . . 80 



Pteria Munsteri . 80 



Genus EUMICROTIS . . .81 



Eumicrotis curta . . 81 



Family TRIGONIIDJE . . . .82 



Genus TRIOONIA .... 82 



Trigonia Conradi ... 83 



Family MYTILID^! . . . .84 



Genus VOLSELLA .... 85 



Volsella pertenuis . . .86 



formosa ... 86 



Family ARCID.E 87 



Subfamily ARCING .... 88 



Subfamily MACRODONTINJE . . 88 



Genus GRAMMATODON ... 89 



Grammatodon inornatus . 90 



Subfamily AXININJE ... 88 



Family UNIONID^E .... 90 



Genus UNIO 92 



TJnio nucalis ... 92 



Family CRASSATELLIDJE ... 93 



Genus ASTARTE .... 93 



Astarte fragilis ... 94 



Astarte inornata ... 94 



Family TANCKEDIID^; ... 95 



Genus TANCREDIA .... 95 



Tancredia Warrenana . . 96 



? ffiquilateralis . . 96 



Family CARDIID^: . . . .97 



