. Bulletin - United States National Museum. Science. 166 BULX,ETIN 125, UNITED STATES NATIONAL MUSEUM. zone. Employing the known localities we have the following table for the Northern Henaisphere: Species. Geolopcal distribution. Latitude. H. clavula Helvetian of Italy 45"^ Pliocene of Rhodes , 36° H. sandbergeri Aquitanian of Gironde 44° H. Tostrigera Upper Miocene of Virginia 37° Upper Miocene of North Carolina 35° Lower PUocene of South Carolina 33° Upper Pliocene of Florida 25° Recent of Florida 22° The interpretation of this table indicates in a striking fashion the rapid and contin
. Bulletin - United States National Museum. Science. 166 BULX,ETIN 125, UNITED STATES NATIONAL MUSEUM. zone. Employing the known localities we have the following table for the Northern Henaisphere: Species. Geolopcal distribution. Latitude. H. clavula Helvetian of Italy 45"^ Pliocene of Rhodes , 36° H. sandbergeri Aquitanian of Gironde 44° H. Tostrigera Upper Miocene of Virginia 37° Upper Miocene of North Carolina 35° Lower PUocene of South Carolina 33° Upper Pliocene of Florida 25° Recent of Florida 22° The interpretation of this table indicates in a striking fashion the rapid and continuous descent of the Tropic toward the Equator. No species of the genus exists in the faluns of Touraine (forty-ninth parallel) situated without the equitorial zone. On the contrary, the Helvetian of Italy represented by H. clavula was nearer. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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