. Bulletins of American paleontology. 26 Bulletin 292. Text-figure 3. — Definition of measurements of major dimensions of the turrid shell. H — height, Dmix — maximum diameter, Ha — height of aperture, PW — width of periphery, SW — width of shoulder slope, SH — height of shoulder slope, Hb — height of body whorl, y — shoulder slope angle. sizes greater than 50 specimens for 7 of the Paleogene species treated in this report represent the largest collections of deep-water turrid material known to me. These seven species occur at some of the highest frequencies and densities among mollusk species
. Bulletins of American paleontology. 26 Bulletin 292. Text-figure 3. — Definition of measurements of major dimensions of the turrid shell. H — height, Dmix — maximum diameter, Ha — height of aperture, PW — width of periphery, SW — width of shoulder slope, SH — height of shoulder slope, Hb — height of body whorl, y — shoulder slope angle. sizes greater than 50 specimens for 7 of the Paleogene species treated in this report represent the largest collections of deep-water turrid material known to me. These seven species occur at some of the highest frequencies and densities among mollusk species in the deep- water Paleogene facies in the Pacific Northwest. Data from relatively detailed sampling of the bathyal zone in Sagami Bay, Japan, (Oku- tani, 1964, 1968) suggest that high frequency and density are equally characteristic of some living deep-water turrid species. A major difference between Paleogene and modern deep-water turrid faunas is the proportional representation of toxoglossate and non-toxoglossate species. Although the more advanced turrid sub- families are represented in shallow-water Paleogene faunas (Powell, 1966, for geologic ranges), the deep-water faunas examined in the course of this study consist exclusively of species falling within the. 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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