Annals of the New York Academy of Sciences, Volumen20

acanthopores Active Member adansoni adult albite amphibole analcite antennal antennal scapes aperture apical angle apophyllite appears basalt basin body volution border Bourran brown calcite Campagnac canal chabazite cheeks chlorite clypeus coal bed color Columbia University collection conglomerate convex costæ crystals datolite Decazeville découverte deposits DESHAYES elongated Emery epinotum flattened garnet gaster genus greatest diameter head herculeanus heulandite HORIZON AND LOCALITY intercalated laumontite legs Length less lower mandibles margin median mesonotum mesopores minerals narrow natrolite numerous oblique ornamentation outer lip pectolite petiole plagioclase plate portion posterior Potamides Potamidopsis prehnite primary spirals protoconch pubescence quartz ribs rocks rounded rows of nodes sandstone shagreened shale shell side Slide slightly slope species specimens stage stilbite strongly sub-sutural surface sutural angle thick thickened thin thorax tibiæ tion transverse tricarinata upper volution walls Wheeler whorl width worker major yellow zeolites Zoarium zoœcia