Preliminary Report Upon Invertebrate Fossils Collected By the Expeditions of 187
Preliminary Report Upon Invertebrate Fossils Collected By the Expeditions of 187
Geographical Surveys West of the 100th Meridian U
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Strata of the age of the Quebec group, Schell- bourne, Schell Creek range, Nevada. TRENTON PERIOD. HYDEOZOA. Genus GRAPTOLITHUS Linnaeus. GRAPTOLITIIUS (DIPLOGRAPTUS) HYPNIFORMIS (sp. Nov. ) Stipe sim- ple, slender; sides flat ; edges nearly straight and nearly parallel, the in- crease in. Width being very slight from the proximal or basal end toward the distal end. Serratures deep, narrow, sharply rounded or angular at bottom, the inner and outer sides both rising at acute angles with the axis... of the stipe, those of adjacent cells joining together to form moder- ately long, slender, mucronate points, directed strongly upward, between the cells. At the proximal end of the stipe, small downward-diverg- ing points are sometimes seen, like those of G. Whitfieldi Hall, and other allied species; and, like those species, this has a slender, thread- like axis, passing longitudinally through the center of the stipe and 13 extending more or less beyond the distal cells. Serratures, or cells, about twelve in the length of a centimeter.
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