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Books Books 1 - 5 of 5 on ... gradually in size, somewhat compressed laterally, and a little excavated without....  
" ... gradually in size, somewhat compressed laterally, and a little excavated without being distinctly channeled on each side of the ventral keel ; inner ones but slightly embraced by each succeeding turn, and consequently well exposed in the wide umbilicus.... "
The University Geological Survey of Kansas - Page 460
1898 - 594 pages
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Proceedings of the American Philosophical Society Held at ..., Volume 11

Electronic journals - 1871
...ornamented with numerous unequal coshe, some of the larger of which bear a small, somewhat pinched node near the umbilicus, and two closely approximated...around the ventro-lateral margins where they all curve very strongly forward as they pass upon the periphery; spaces between each two of the large nodose...
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Proceedings of the American Philosophical Society Held at ..., Volume 11

Electronic journals - 1871
...orjiamented with numerous unequal costse, some of the larger of which bear a small, somewhat pinched node near the umbilicus, and two closely approximated small nodes around the veutro-lateral margins, where they all curve very strongly forward as they pass upon the periphery;...
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The Colorado Formation and Its Invertebrate Fauna, Volume 8, Issue 106

Timothy William Stanton - Geology, Stratigraphic - 1893 - 288 pages
...and consequently well exposed in the wide umbilicus. Surface ornamented with numerous unequal costae, some of the larger of which bear a small, somewhat...around the ventro-lateral margins, where they all curve very strongly forward as they pass upon the periphery ; spaces between each two of the large nodose...
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Bulletin - United States Geological Survey, Issues 103-110

Geological Survey (U.S.) - Geology - 1893
...and consequently well exposed in the wide umbilicus. Surface ornamented with numerous unequal costae, some of the larger of which bear a small, somewhat...the umbilicus, and two closely approximated small 7iodes around the ventro-latcral margins, where they all curve very strongly forward as they pass upon...
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Reports, Volume 4

Kansas Geological Survey - Geology - 1898
...consequently well exposed in the wide umbilicus. Surface ornamented with numerous unequal costü', some of the larger of which bear a small, somewhat...and two closely approximated, small nodes around the veutro-lateral margins, where they all curve strongly forward as they pass upon the periphery ; spaces...
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