Bulletin - United States Geological Survey
Bulletin - United States Geological Survey
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(Date of volume, 1898.) Batesville sandstone: Batesville, Ark.
This species occurs in but one of the Survey collections from the Moorefield shale, but in it it seems to be reasonably abundant, eight specimens having been obtained. In its specific characters it is not quite typical, but the differences are not such, in my judgment, as would warrant discriminating it as a variety, especially as the dif- ferent individuals vary considerably among themselves. The points in which this form is though...t to vary from typical D. elegans are its large size and spreading shape, its somewhat stronger and more regular lirae, and the inferior development of spines.
The shape of the ventral valve, as remarked, is similar to that of D. elegans, but is broader and rather more spreading. An ill- defined but distinct sinus is a constant character. The lirae are strong, rigid, and rather fine, about eleven in 10 mm., but in one specimen they are finer, sixteen in 10 mm. Sometimes also they are rather irregular and nodose.
What to read after Bulletin - United States Geological Survey?
You can find similar books in the "Read Also" column, or choose other free books by Geological Survey Us to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
(Date of volume, 1898.) Batesville sandstone: Batesville, Ark.
This species occurs in but one of the Survey collections from the Moorefield shale, but in it it seems to be reasonably abundant, eight specimens having been obtained. In its specific characters it is not quite typical, but the differences are not such, in my judgment, as would warrant discriminating it as a variety, especially as the dif- ferent individuals vary considerably among themselves. The points in which this form is though...t to vary from typical D. elegans are its large size and spreading shape, its somewhat stronger and more regular lirae, and the inferior development of spines.
The shape of the ventral valve, as remarked, is similar to that of D. elegans, but is broader and rather more spreading. An ill- defined but distinct sinus is a constant character. The lirae are strong, rigid, and rather fine, about eleven in 10 mm., but in one specimen they are finer, sixteen in 10 mm. Sometimes also they are rather irregular and nodose.
What to read after Bulletin - United States Geological Survey?
You can find similar books in the "Read Also" column, or choose other free books by Geological Survey Us to read onlineMoreLess
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