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Showing results for tags 't. peramplum'.
From the album: Fauna and Flora of the Austin Group in TexasThis specimen is the largest of its genus in my collection, and the largest known to me in any collection. It measures about 7 cm in height, and 4.3 cm in diameter. It retains its tubercles in the most mature whorl sections that are preserved well enough to tell. The specimen is quite crushed.