. Bulletin - New York State Museum. Science. BEEKMANTOWN AND CHAZY FORMATIONS OF CHAM PLAIN BASIN 477 Museum of Natural History and the United States National Museum: This is a distinct species, the sutures being straighter in the ephebic stage than in true e a t o n i , the venter and sides are more decidedly flattened, and the relative proportions of the last whorl at the same age different. The ventrodorsal and transverse diam- eters are about equal, whereas in e a t o n i the transverse is con- siderably longer than the ventrodorsal in the mesal plane. The amount of involution in eatoni an

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. Bulletin - New York State Museum. Science. BEEKMANTOWN AND CHAZY FORMATIONS OF CHAM PLAIN BASIN 477 Museum of Natural History and the United States National Museum: This is a distinct species, the sutures being straighter in the ephebic stage than in true e a t o n i , the venter and sides are more decidedly flattened, and the relative proportions of the last whorl at the same age different. The ventrodorsal and transverse diam- eters are about equal, whereas in e a t o n i the transverse is con- siderably longer than the ventrodorsal in the mesal plane. The amount of involution in eatoni and the depth of the contact furrow in the ephebic stage is also 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 New York State Museum; New York State Museum. Albany : New York State Education Dept

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887